McMaster-Carr logo
    Filter by
    System of Measurement
    End Type
    Key-Locking Insert Wall Type
    Number of Locking Keys
    Thread Spacing
    Industrial Info Compare
    Thread Direction
    External Locking Type
    Industrial Info Compare
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    107 Products
    About Threaded Inserts
    industrial info icon

    Choose the right threaded insert for your application and learn how to install it securely.

    Thread-Locking Threaded Inserts

    Image of Product. Bottom orientation. Threaded Inserts. Thread-Locking Threaded Inserts.
    With Loctite® adhesive already on the threads, these inserts won’t back out or vibrate loose. The adhesive reaches full strength after 72 hours. Unlike helical inserts, you can install them with a standard drill and tap. However, thread-locking inserts are difficult to remove and reuse.
    After drilling and tapping your hole, install inserts with a wrench or an installation bit. To use a wrench, thread an insert and two hex nuts onto a bolt. Then, grip and turn the top nut to drive into the hole. For slotted inserts, you can drive with a slotted screwdriver instead.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limits.
    Extra-Thick Wall—Stronger than standard- and thin-wall inserts, use them to reduce the size of tapped holes or replace threads that have been drilled out.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these inserts won't degrade when exposed to harsh weather, salt water, and most chemicals.
    Inserts
    Installation
    Tools
    Inserts with
    Installation Tools
    Thread Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Drive
    Style
    Pkg.
    Qty.
    Pkg.
    Each
    No. of Inserts
    Included
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    3/8"-16
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		1090248A03100000094110A1600000001095109A113000000
    3/8"-16
    		9/16"-12
    		1"31/64"
    		0.484"Slotted
    		590248A0320000094110A16000000————0
    3/8"-24
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		1090248A0820000094110A16000000————0
    9/16"-12
    		3/4"-10
    		0.656"21/32"
    		0.656"Slotted
    		590248A0410000094110A18000000————0
    M10 x 1.25 mm9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		1097084A1250000094110A16000000————0
    M10 x 1.5 mm9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		1097084A1300000094110A16000000————0
     
    18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		590247A0140000094110A16000000————0
    3/8"-24
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		590247A0240000094110A16000000————0
    M10 x 1.25 mm9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		197120A125000094110A16000000————0
    M10 x 1.5 mm9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		197120A130000094110A16000000————0
     
    Highly Corrosion-Resistant 316 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		190266A354000094110A16000000————0
     
    Thin Wall
     
    Black Phosphate-Coated Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"Slotted
    		590259A1540000094110A17000000————0
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"Slotted
    		590259A1580000094110A17000000————0
     
    Extra-Thick Wall
     
    Black Phosphate-Coated Steel
    5/16"-18
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		1090246A0270000094110A15000000————0
     
    18-8 Stainless Steel
    5/16"-18
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		194165A490000094110A15000000————0
     

    Key-Locking Threaded Insert Assortments with Installation Tools

    Image of Product. Front orientation. Threaded Inserts. Key-Locking Threaded Insert Assortments with Installation Tools.
    What you need to add or repair a range of thread sizes in soft metal, such as aluminum. These assortments include multiple key-locking inserts of each size and an installation tool. They're comparable to Keensert inserts.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limitations.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    No. of Inserts
    Included
    Includes
    Thread
    Spacing
    For Tap Thread Size
    Drill Bit Size
    For Max. Hole Dia.
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    771"-12 Thread × 1 3/8" Installed Lg. (2 Each)
    1/2"-20 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-28 Thread × 3/8" Installed Lg. (20 Each)
    3/4"-16 Thread × 1 1/8" Installed Lg. (3 Each)
    3/8"-24 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.438" Installed Lg. (15 Each)
    5/8"-18 Thread × 7/8" Installed Lg. (3 Each)
    7/16"-20 Thread × 5/8" Installed Lg. (10 Each)
    7/8"-14 Thread × 1 1/4" Installed Lg. (3 Each)
    9/16"-18 Thread × 0.813" Installed Lg. (5 Each)
    Installation Tool    		Fine
    		7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    3/4"-16
    7/8"-14
    1 1/8"-12
    1 1/4"-12
    1 3/8"-12
    		29/64"
    33/64"
    37/64"
    45/64"
    53/64"
    1 1/16"
    1 3/16"
    1 5/16"
    X
    		0.397"
    0.453"
    0.516"
    0.578"
    0.703"
    0.828"
    1.063"
    1.186"
    1.313"    		90284A2150000000
    771"-8 Thread × 1 3/8" Installed Lg. (2 Each)
    1/2"-13 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-20 Thread × 3/8" Installed Lg. (20 Each)
    3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each)
    3/8"-16 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.438" Installed Lg. (15 Each)
    5/8"-11 Thread × 7/8" Installed Lg. (3 Each)
    7/16"-14 Thread × 5/8" Installed Lg. (10 Each)
    7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each)
    9/16"-12 Thread × 0.813" Installed Lg. (5 Each)
    Installation Tool    		Coarse
    		7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    3/4"-16
    7/8"-14
    1 1/8"-12
    1 1/4"-12
    1 3/8"-12
    		29/64"
    33/64"
    37/64"
    45/64"
    53/64"
    1 1/16"
    1 3/16"
    1 5/16"
    X
    		0.397"
    0.453"
    0.516"
    0.578"
    0.703"
    0.828"
    1.063"
    1.186"
    1.313"    		90284A211000000
     
    18-8 Stainless Steel
    771"-12 Thread × 1 3/8" Installed Lg. (2 Each)
    1/2"-20 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-28 Thread × 3/8" Installed Lg. (20 Each)
    3/4"-16 Thread × 1 1/8" Installed Lg. (3 Each)
    3/8"-24 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.438" Installed Lg. (15 Each)
    5/8"-18 Thread × 7/8" Installed Lg. (3 Each)
    7/16"-20 Thread × 5/8" Installed Lg. (10 Each)
    7/8"-14 Thread × 1 1/4" Installed Lg. (3 Each)
    9/16"-18 Thread × 0.813" Installed Lg. (5 Each)
    Installation Tool    		Fine
    		7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    3/4"-16
    7/8"-14
    1 1/8"-12
    1 1/4"-12
    1 3/8"-12
    		29/64"
    33/64"
    37/64"
    45/64"
    53/64"
    1 1/16"
    1 3/16"
    1 5/16"
    X
    		0.397"
    0.453"
    0.516"
    0.578"
    0.703"
    0.828"
    1.063"
    1.186"
    1.313"    		90284A415000000
    771"-8 Thread × 1 3/8" Installed Lg. (2 Each)
    1/2"-13 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-20 Thread × 3/8" Installed Lg. (20 Each)
    3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each)
    3/8"-16 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.438" Installed Lg. (15 Each)
    5/8"-11 Thread × 7/8" Installed Lg. (3 Each)
    7/16"-14 Thread × 5/8" Installed Lg. (10 Each)
    7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each)
    9/16"-12 Thread × 0.813" Installed Lg. (5 Each)
    Installation Tool    		Coarse
    		7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    3/4"-16
    7/8"-14
    1 1/8"-12
    1 1/4"-12
    1 3/8"-12
    		29/64"
    33/64"
    37/64"
    45/64"
    53/64"
    1 1/16"
    1 3/16"
    1 5/16"
    X
    		0.397"
    0.453"
    0.516"
    0.578"
    0.703"
    0.828"
    1.063"
    1.186"
    1.313"    		90284A411000000
     
    Thin Wall
     
    Black Phosphate-Coated Steel
    811/2"-13 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-20 Thread × 3/8" Installed Lg. (20 Each)
    3/8"-16 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.438" Installed Lg. (15 Each)
    7/16"-14 Thread × 0.563" Installed Lg. (10 Each)
    10-24 Thread × 0.313" Installed Lg. (20 Each)
    Installation Tool    		Coarse
    		5/16"-18
    3/8"-16
    7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    		29/64"
    33/64"
    37/64"
    I
    Q
    X
    		0.272"
    0.332"
    0.397"
    0.453"
    0.516"
    0.578"    		90284A200000000
    811/2"-20 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-28 Thread × 3/8" Installed Lg. (20 Each)
    3/8"-24 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.438" Installed Lg. (15 Each)
    7/16"-20 Thread × 0.563" Installed Lg. (10 Each)
    10-32 Thread × 0.313" Installed Lg. (20 Each)
    Installation Tool    		Fine
    		5/16"-18
    3/8"-16
    7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    		29/64"
    33/64"
    37/64"
    I
    Q
    X
    		0.272"
    0.332"
    0.397"
    0.453"
    0.516"
    0.578"    		90284A300000000
     
    18-8 Stainless Steel
    811/2"-13 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-20 Thread × 3/8" Installed Lg. (20 Each)
    3/8"-16 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.438" Installed Lg. (15 Each)
    7/16"-14 Thread × 0.563" Installed Lg. (10 Each)
    10-24 Thread × 0.313" Installed Lg. (20 Each)
    Installation Tool    		Coarse
    		5/16"-18
    3/8"-16
    7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    		29/64"
    33/64"
    37/64"
    I
    Q
    X
    		0.272"
    0.332"
    0.397"
    0.453"
    0.516"
    0.578"    		90284A400000000
    811/2"-20 Thread × 5/8" Installed Lg. (6 Each)
    1/4"-28 Thread × 3/8" Installed Lg. (20 Each)
    3/8"-24 Thread × 1/2" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.438" Installed Lg. (15 Each)
    7/16"-20 Thread × 0.563" Installed Lg. (10 Each)
    10-32 Thread × 0.313" Installed Lg. (20 Each)
    Installation Tool    		Fine
    		5/16"-18
    3/8"-16
    7/16"-14
    1/2"-13
    9/16"-12
    5/8"-11
    		29/64"
    33/64"
    37/64"
    I
    Q
    X
    		0.272"
    0.332"
    0.397"
    0.453"
    0.516"
    0.578"    		90284A500000000
     

    Key-Locking Threaded Inserts for Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Key-Locking Threaded Inserts for Soft Metal.
    Add strong threads in soft metal, such as aluminum. The keys on these inserts drive into holes to hold more securely than thread-locking or helical inserts. They prevent slipping and rotating, so they’re stable enough for use in vehicle or aerospace parts that experience heavy vibration. These inserts are comparable to Keensert inserts.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limitations.
    Extra-Thick Wall—Stronger than standard- and thin-wall inserts, use them to reduce the size of tapped holes or replace threads that have been drilled out.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    High-Strength High-Temperature A286 Stainless Steel—High temperatures won't reduce the load capacity of these inserts. They also resist chemicals such as bleach and chlorine.
    Inserts
    Installation
    Tools
    Inserts with
    Installation Tools
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Specs. Met
    Each
    Each
    No. of Inserts
    Included
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4—90245A0340000092100A717000000690245A014000000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4—90245A074000092100A71700000690245A05400000
    9/16"-12
    		3/4"-16
    		0.813"45/64"
    		0.703"4—90245A037000092100A72500000390245A01700000
     
    18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4—91731A054000092100A71700000691731A01400000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4—91731A065000092100A71700000691731A02500000
    9/16"-12
    		3/4"-16
    		0.813"45/64"
    		0.703"4—91731A0570000092100A72500000391731A01700000
     
    High-Strength High-Temperature A286 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831CA10493509A2900000093904A54500000————0
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831CA20493509A31000000———0————0
     
    Thin Wall
     
    Black Phosphate-Coated Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4—92070A130000093875A02500000692070A35700000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4—92070A260000093875A02500000692070A36300000
     
    18-8 Stainless Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4—93340A4250000093875A02500000693340A695000000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4—93340A3250000093875A02500000693340A706000000
     
    Extra-Thick Wall
     
    Black Phosphate-Coated Steel
    5/16"-18
    		9/16"-12
    		0.438"33/64"
    		0.516"4—93302A1200000093302A22000000793302A420000000
    5/16"-24
    		9/16"-12
    		0.438"33/64"
    		0.516"4—93302A5300000093302A22000000————0
    9/16"-12
    		7/8"-14
    		0.813"53/64"
    		0.828"4—93302A5800000093302A72000000————0
     
    18-8 Stainless Steel
    5/16"-18
    		9/16"-12
    		0.438"33/64"
    		0.516"4—93340A8170000093302A22000000————0
    5/16"-24
    		9/16"-12
    		0.438"33/64"
    		0.516"4—93340A8180000093302A22000000————0
     

    Mil.-Spec. Key-Locking Threaded Inserts For Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Mil.-Spec. Key-Locking Threaded Inserts For Soft Metal.
    These inserts are manufactured and tested to meet or compare to strict standards adopted by the U.S. military. The keys drive into aluminum and other soft metal for a secure hold that won't slip or rotate, even in vibrating vehicle or aerospace parts. These inserts are comparable to Keensert inserts.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limitations.
    Extra-Thick Wall—Stronger than standard- and thin-wall inserts, use them to reduce the size of tapped holes or replace threads that have been drilled out.
    High-Strength Cadmium-Plated Alloy Steel—These inserts have the strength to stand up to high-pressure applications and a plating that helps screws thread in smoothly.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Installation
    Tools
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Specs. Met
    Each
    Each
    Standard Wall
     
    High-Strength Cadmium-Plated Alloy Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831A10495101A10700000093904A545000000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831A20495101A1270000———0
     
    18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.521"4MS51831-10493904A540000093904A54500000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.521"4NAS1395C6, MS51831-20493904A5420000———0
    9/16"-12
    		13/16"-16
    		0.813"49/64"
    		0.771"4MS51831-10793904A2340000093904A74400000
     
    Thin Wall
     
    High-Strength Cadmium-Plated Alloy Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4MS51830A10995101A119000093904A72500000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4NAS1394-7, MS51830A20595101A1210000———0
     
    18-8 Stainless Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.521"4MS51830-10993904A227000093904A72500000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.521"4NAS1394C7, MS51830-20593904A2160000———0
     
    Extra-Thick Wall
     
    18-8 Stainless Steel
    5/16"-18
    		9/16"-12
    		0.438"33/64"
    		0.521"4MS51832-10393904A2220000093904A26200000
    5/16"-24
    		9/16"-12
    		0.438"33/64"
    		0.521"4MS51832-20393904A22300000———0
    9/16"-12
    		7/8"-14
    		0.813"53/64"
    		0.833"4MS51832-10793904A2350000093904A27900000
     

    Thread-Locking Threaded Insert Assortments

    Image of Product. Front orientation. Threaded Inserts. Thread-Locking Threaded Insert Assortments.
    These assortments include various sizes of thread-locking inserts, which won’t back out or loosen from vibration. Also known as E-Z Lok, they come with Loctite® adhesive already applied, and the adhesive reaches full strength after 72 hours. After drilling and tapping your hole, install inserts with a wrench or use an installation bit (not included). To use a wrench, thread an insert and two hex nuts onto a bolt. Then, grip and turn the top nut to drive into the hole.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    No. of Inserts
    Included
    Includes
    Thread
    Spacing
    For Tap Thread
    Size
    Drill Bit
    Size
    For Maximum
    Hole Diameter
    Drive
    Style
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    36M6×1 mm Thread × 0.406" Installed Lg. (10 Each)
    M8×1.25 mm Thread × 0.484" Installed Lg. (10 Each)
    M10×1.5 mm Thread × 0.516" Installed Lg. (10 Each)
    M12×1.75 mm Thread × 0.656" Installed Lg. (6 Each)    		Coarse
    		3/8"-16,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    27/64"
    31/64"
    21/32"    		5/16"
    27/64"
    31/64"
    21/32"    		Slotted
    		97084A210000000
    461/2"-13 Thread × 0.656" Installed Lg. (6 Each)
    1/4"-20 Thread × 0.438" Installed Lg. (10 Each)
    3/8"-16 Thread × 0.516" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.484" Installed Lg. (10 Each)
    10-24 Thread × 0.406" Installed Lg. (10 Each)    		Coarse
    		3/8"-16,
    7/16"-14,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		Slotted
    		90248A11200000
    461/2"-20 Thread × 0.656" Installed Lg. (6 Each)
    1/4"-28 Thread × 0.438" Installed Lg. (10 Each)
    3/8"-24 Thread × 0.516" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.484" Installed Lg. (10 Each)
    10-32 Thread × 0.406" Installed Lg. (10 Each)    		Fine
    		3/8"-16,
    7/16"-14,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		Slotted
    		90248A11400000
     
    18-8 Stainless Steel
    36M6×1 mm Thread × 0.406" Installed Lg. (10 Each)
    M8×1.25 mm Thread × 0.484" Installed Lg. (10 Each)
    M10×1.5 mm Thread × 0.516" Installed Lg. (10 Each)
    M12×1.75 mm Thread × 0.656" Installed Lg. (6 Each)    		Coarse
    		3/8"-16,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    27/64"
    31/64"
    21/32"    		5/16"
    27/64"
    31/64"
    21/32"    		Slotted
    		97120A033000000
    461/2"-13 Thread × 0.656" Installed Lg. (6 Each)
    1/4"-20 Thread × 0.438" Installed Lg. (10 Each)
    3/8"-16 Thread × 0.516" Installed Lg. (10 Each)
    5/16"-18 Thread × 0.484" Installed Lg. (10 Each)
    10-24 Thread × 0.406" Installed Lg. (10 Each)    		Coarse
    		3/8"-16,
    7/16"-14,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		Slotted
    		90247A031000000
    461/2"-20 Thread × 0.656" Installed Lg. (6 Each)
    1/4"-28 Thread × 0.438" Installed Lg. (10 Each)
    3/8"-24 Thread × 0.516" Installed Lg. (10 Each)
    5/16"-24 Thread × 0.484" Installed Lg. (10 Each)
    10-32 Thread × 0.406" Installed Lg. (10 Each)    		Fine
    		3/8"-16,
    7/16"-14,
    1/2"-13,
    9/16"-12,
    3/4"-10    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		5/16"
    23/64"
    27/64"
    31/64"
    21/32"    		Slotted
    		90247A032000000
     

    Key-Locking Threaded Inserts with Installation Tools

    Image of Product. Front orientation. Threaded Inserts. Key-Locking Threaded Inserts with Installation Tools.
    Paired with the right tool for installation, these inserts create strong threads in soft metal, such as aluminum. They have keys that drive into material to prevent inserts from slipping and rotating in the hole.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limitations.
    Extra-Thick Wall—Stronger than standard- and thin-wall inserts, use them to reduce the size of tapped holes or replace threads that have been drilled out.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    No. of Inserts
    Included
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4690245A014000000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4690245A05400000
    9/16"-12
    		3/4"-16
    		0.813"45/64"
    		0.703"4390245A01700000
     
    18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4691731A01400000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4691731A02500000
    9/16"-12
    		3/4"-16
    		0.813"45/64"
    		0.703"4391731A01700000
     
    Thin Wall
     
    Black Phosphate-Coated Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4692070A35700000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4692070A36300000
     
    18-8 Stainless Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4693340A695000000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4693340A706000000
     
    Extra-Thick Wall
     
    Black Phosphate-Coated Steel
    5/16"-18
    		9/16"-12
    		0.438"33/64"
    		0.516"4793302A420000000
     

    Screw-Locking Seize-Resistant Key-Locking Threaded Inserts for Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Screw-Locking Seize-Resistant Key-Locking Threaded Inserts for Soft Metal.
    Create the tightest hold in aluminum and other soft metal without screws sticking. The lubricant on these inserts eases installation, and the irregularly shaped threads won’t let screws back out from vibration. Inserts have keys that drive into material to prevent them from slipping or rotating in the hole.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Thin Wall—Use these inserts near the edge of workpieces or wherever you only have space for a small hole. They're also lighter than standard and extra-thick wall inserts for applications with strict weight limitations.
    Dry-Film-Lubricated Cadmium-Plated Steel—The plating creates a barrier against rust.
    Dry-Film-Lubricated 18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Installation
    Tools
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Specs. Met
    Each
    Each
    Standard Wall
     
    Dry-Film-Lubricated Cadmium-Plated Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831A104L97255A25200000093904A545000000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831A204L97255A25300000———0
     
    Dry-Film-Lubricated 18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.500"33/64"
    		0.516"4MS51831-104L97255A137000093904A54500000
    3/8"-24
    		9/16"-12
    		0.500"33/64"
    		0.516"4NAS1395C6L97255A1380000———0
     
    Thin Wall
     
    Dry-Film-Lubricated 18-8 Stainless Steel
    7/16"-14
    		9/16"-12
    		0.563"33/64"
    		0.516"4MS51830-109L97255A1250000093904A72500000
    7/16"-20
    		9/16"-12
    		0.563"33/64"
    		0.516"4NAS1394C7L, MS51830-205L97255A12600000———0
     

    Finish-Your-Own Key-Locking Threaded Inserts for Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Finish-Your-Own Key-Locking Threaded Inserts for Soft Metal.
    Image of Specification. Side1 orientation. Contains Annotated. Threaded Inserts. Finish-Your-Own Key-Locking Threaded Inserts for Soft Metal.
    Tap the thread size you need into the solid body of these inserts. They’re a great choice when you need a custom combination of internal thread size and external diameter. Use them to repair or add new threads in soft metal, such as aluminum. They can also plug threaded holes without the hassle of welding. Keys on the inserts drive into material to prevent slipping and rotating in the hole.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    Inserts
    Installation
    Tools
    For Tap Thread
    Size
    Installed
    Lg.
    Max. Tapping
    Dia.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Each
    Each
    Standard Profile
     
    Black Phosphate-Coated Steel
    9/16"-12
    		0.500"7/16"33/64"
    		0.516"493774A15000000093741A1500000000
     

    Closed-End Key-Locking Threaded Inserts for Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Closed-End Key-Locking Threaded Inserts for Soft Metal.
    Image of Product. Shown In Cross Section. Side1 orientation. Threaded Inserts. Closed-End Key-Locking Threaded Inserts for Soft Metal.

    Shown

    In

    Cross

    Section

    Keep threads clear and prevent leaks. These inserts have a closed end that blocks debris and fluids from entering parts. Keys drive into soft metal, such as aluminum, so they don’t slip or rotate in the hole. Comparable to Keensert inserts, they’re more secure than thread-locking inserts.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Inserts
    Installation
    Tools
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Specs. Met
    Each
    Each
    Standard Wall
     
    18-8 Stainless Steel
    3/8"-16
    		9/16"-12
    		0.813"33/64"
    		0.516"4MIL-I-4591493508A27000000093904A545000000
    3/8"-24
    		9/16"-12
    		0.813"33/64"
    		0.516"4MIL-I-4591493508A28000000———0
     

    Screw-Locking Helical Threaded Inserts

    Image of Product. Pronged. Bottom orientation. Threaded Inserts. Screw-Locking Helical Threaded Inserts, Pronged.

    Pronged

    The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration. Use these inserts to create or repair threads in pumps and other machinery that shakes and rattles. Also known as Heli-Coil inserts.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Through-Hole
    Taps
    Closed-End
    Hole Taps
    Installation
    Tools
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    Pronged
     
    18-8 Stainless Steel
    9/16"-12
    		0.562"19/32"
    		0.594"NASM21209, MS21209C9-10190296A1400000091709A11100000091709A467000000090261A171000000
    9/16"-12
    		0.844"19/32"
    		0.594"NASM21209, MS21209C9-15190296A147000091709A1110000091709A46700000090261A17100000
     

    Helical Threaded Inserts

    Image of Product. Pronged. Bottom orientation. Threaded Inserts. Helical Threaded Inserts, Pronged.

    Pronged

    Restore, reinforce, or create threads in metal. The tough coils on these inserts expand once installed to anchor in a tapped hole. Also known as Heli-Coil inserts, they're often used in engine heads and machinery housings where strong connections are critical. Unlike threadlocking inserts, you can remove and reuse them without them losing their strength.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Through-Hole
    Taps
    Closed-End
    Hole Taps
    Installation
    Tools
    Inserts with
    Installation Tools
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    No. of Inserts
    Included
    Each
    Pronged
     
    18-8 Stainless Steel
    9/16"-12
    		0.562"19/32"
    		0.594"MS122086591732A38900000091709A11100000091709A467000000090261A171000000————0
    9/16"-12
    		0.844"19/32"
    		0.594"MS122126591732A2170000091709A1110000091709A46700000090261A17100000691732A3170000000
     
    Extraction Tools
    Remove installed helical inserts.
    For Pronged Helical Inserts—Place the tip into pronged inserts and lightly strike the tool’s head. Then, turn the tool counterclockwise with pressure to extract the insert.
    For Thread Size
    Each
    For Pronged Helical Inserts
    7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 1/2"-28, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 5/8"-24, 3/4"-10, 3/4"-16, 3/4"-20, 7/8"-9, 7/8"-14, 7/8"-20, 1"-8, 1"-12, 1"-14, M12, M14, M16, M18, M20, M22, M24
    		90254A330000000
     

    Helical Threaded Inserts with Installation Tools

    Image of Product. Drill Bit, Installation Tool and Through-Hole Tap. Front orientation. Threaded Inserts. Helical Threaded Inserts with Installation Tools, Pronged, Drill Bit, Through-Hole Tap, Installation Tool.

    Drill Bit, Installation Tool

    and Through-Hole Tap

    Quickly restore stripped threads—these inserts come with through-hole taps and installation tools. The tough coils on these inserts expand once installed to anchor in a tapped hole.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Inserts
    Included
    Includes
    Each
    Pronged
     
    18-8 Stainless Steel
    9/16"-12
    		0.844"19/32"
    		0.594"6Drill Bit
    Installation Tool
    Through-Hole Tap    		91732A3170000000
     

    Thread-Locking Threaded Inserts with Installation Tools

    Image of Product. Front orientation. Threaded Inserts. Thread-Locking Threaded Inserts with Installation Tools.
    What you need to add or repair threads quickly in parts under stress or vibration. These inserts come with a closed-end tap, a drill bit, and an installation bit. Also known as E-Z Lok, they have Loctite® adhesive already applied, and the adhesive reaches full strength after 72 hours.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Drive
    Style
    No. of Inserts
    Included
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    3/8"-16
    		9/16"-12
    		0.515"31/64"
    		0.484"Slotted
    		1095109A113000000
     

    Screw-Locking Thread-Locking Threaded Inserts

    Image of Product. Bottom orientation. Threaded Inserts. Screw-Locking Thread-Locking Threaded Inserts.
    Adhesive on both the internal and external threads keeps these inserts in place and holds screws tight. Also known as E-Z Lok, they use Loctite® adhesive that reaches full strength after 72 hours. Inserts have thick walls for strength and can be used to fill large holes with stripped threads.
    After drilling and tapping your hole, install inserts with a wrench or an installation bit. To use a wrench, thread an insert and two hex nuts onto a bolt. Then, grip and turn the top nut to drive into the hole. You can also use a slotted screwdriver.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    Black Phosphate-Coated Steel—These inserts resist occasional moisture.
    Inserts
    Installation
    Tools
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Drive
    Style
    Each
    Each
    Standard Wall
     
    Black Phosphate-Coated Steel
    3/8"-16
    		9/16"-12
    		0.516"31/64"
    		0.484"Slotted
    		96137A1500000094110A160000000
     

    Seize-Resistant Swage-Locking Threaded Inserts

    Image of Product. Bottom orientation. Threaded Inserts. Seize-Resistant Swage-Locking Threaded Inserts.
    Image of Specification. Front orientation. Contains Annotated. Threaded Inserts. Seize-Resistant Swage-Locking Threaded Inserts.
    Smoothly install these inserts for strong threads near the edges and corners of soft metal surfaces. They’re lubricated to prevent sticking as you thread them in. Since these have thinner walls than our key-locking and thread-locking inserts, they don’t need as much space and won't bulge or crack the material. The knurls press (swage) into the material to keep inserts in place when you tighten or loosen a screw.
    To install these inserts, you need a drill bit, a counterbore, a standard tap, an installation tool, and a hammer. Drill a hole, counterbore the top, and tap it. Place the insert into the installation tool, then hand-tighten it into the tapped hole. Strike the tool to secure the insert and drive the knurls into the surrounding material.
    High-Strength Dry-Film-Lubricated Cadmium-Plated Alloy Steel—Stronger than our 17-4 PH stainless steel inserts, these inserts absorb impact without cracking and stand up to high-pressure applications. The cadmium plating prevents corrosion in wet environments.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Inserts
    Installation
    Tools
    For
    Counterbore
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    For Max.
    Hole Dia.
    Dia.
    Dp.
    Mil. Spec.
    Each
    Each
    High-Strength Dry-Film-Lubricated Cadmium-Plated Alloy Steel
    9/16"-12
    		11/16"-120.844"0.625"0.687"0.15"MIL-DTL-45932/193572A1180000006645N1120000000
     

    Swage-Locking Threaded Inserts

    Image of Product. Bottom orientation. Threaded Inserts. Swage-Locking Threaded Inserts.
    Image of Specification. Front orientation. Contains Annotated. Threaded Inserts. Swage-Locking Threaded Inserts.
    Add strong threads to the edges of soft metal without bulging or cracking the material. These inserts have thinner walls than our key-locking and thread-locking inserts, so they don’t need as much space around them. The knurls press (swage) into the material to keep inserts in place when you tighten or loosen a screw.
    To install these inserts, you need a drill bit, a counterbore, a standard tap, an installation tool, and a hammer. Drill a hole, counterbore the top, and tap it. Place the insert into the installation tool, then hand-tighten it into the tapped hole. Strike the tool to secure the insert and drive the knurls into the surrounding material.
    High-Strength 17-4 PH Stainless Steel—The strongest stainless steel inserts we offer. They handle high-stress installations, such as pump and compressor housings, and the heavy vibration of aircraft parts. They won’t rust in wet and outdoor environments but can’t withstand the harsh chemicals and acids that 316 stainless steel can.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Inserts
    Installation
    Tools
    For
    Counterbore
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    For Max.
    Hole Dia.
    Dia.
    Dp.
    Mil. Spec.
    Each
    Each
    High-Strength 17-4 PH Stainless Steel
    9/16"-12
    		11/16"-120.844"0.625"0.687"0.15"MIL-DTL-45932/193570A1180000006645N1120000000
     
    back to top