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

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

    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.
    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
    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 High-Temperature A286 Stainless Steel
    8-32
    5/16"-18
    0.313"I
    0.272"293509A24000000093904A505000000
    10-32
    3/8"-16
    0.313"Q
    0.332"2MS51831CA20193509A25000000———0
    1/4"-20
    7/16"-14
    0.375"X
    0.397"2MS51831CA10293509A2600000093904A52500000
    1/4"-28
    7/16"-14
    0.375"X
    0.397"2MS51831CA20293509A27000000———0
    5/16"-24
    1/2"-13
    0.438"29/64"
    0.453"4MS51831CA20393509A28000000———0
    3/8"-16
    9/16"-12
    0.500"33/64"
    0.516"4MS51831CA10493509A2900000093904A54500000
    3/8"-24
    9/16"-12
    0.500"33/64"
    0.516"4MS51831CA20493509A31000000———0
    5/8"-18
    7/8"-14
    0.875"53/64"
    0.828"4MS51831CA20893509A32000000———0
     
    Thin Wall
     
    High-Strength High-Temperature A286 Stainless Steel
    2-56
    8-32
    0.125"30 Ga.
    0.134"2MS51830CA10193509A1100000093904A15000000
    4-40
    10-32
    0.172"20 Ga.
    0.161"2MS51830CA10293509A1200000093904A25000000
    6-32
    12-28
    0.172"3/16"
    0.187"2MS51830CA10393509A1300000093904A35000000
    8-32
    1/4"-28
    0.219"1 Ga.
    0.228"2MS51830CA10493509A1400000093904A45000000
    10-24
    5/16"-18
    0.313"I
    0.272"2MS51830CA10593509A1500000093904A60500000
    1/4"-20
    3/8"-16
    0.375"Q
    0.332"2MS51830CA10693509A1600000093904A61500000
    1/4"-28
    3/8"-16
    0.375"Q
    0.332"2MS51830CA20293509A17000000———0
    5/16"-24
    7/16"-14
    0.438"X
    0.397"4MS51830CA20393509A18000000———0
    3/8"-16
    1/2"-13
    0.500"29/64"
    0.453"4MS51830CA10893509A1900000093904A63500000
    3/8"-24
    1/2"-13
    0.500"29/64"
    0.453"4MS51830CA20493509A21000000———0
    1/2"-13
    5/8"-11
    0.625"37/64"
    0.578"4MS51830CA11093509A2200000093904A64500000
    1/2"-20
    5/8"-11
    0.625"37/64"
    0.578"4MS51830CA20693509A23000000———0
    M2 x 0.4 mmM4 x 0.7 mm3 mm3.4 mm
    3.4 mm2NA0147-02093509A3300000094010A41500000
    M3 x 0.5 mmM5 x 0.8 mm4.25 mm4.4 mm
    4.4 mm2NA0147-03093509A3400000094010A43500000
    M4 x 0.7 mmM6 x 0.75 mm5.25 mm5.5 mm
    5.5 mm2NA0147-04093509A3500000094010A44500000
    M5 x 0.8 mmM8 x 1.25 mm8 mm6.9 mm
    6.9 mm2NA0149-05093509A3600000093904A77900000
    M8 x 1 mmM12 x 1.25 mm12 mm10.8 mm
    10.8 mm4NA0149-08093509A3800000093904A78200000
    M8 x 1.25 mmM12 x 1.25 mm12 mm10.8 mm
    10.8 mm493509A3700000093904A78200000
     

    Press-Fit Nuts for Sheet Metal

    Image of Product. Front orientation. Press-Fit Nuts. Press-Fit Nuts for Sheet Metal.
    Image of Product. Bottom orientation. Press-Fit Nuts. Press-Fit Nuts for Sheet Metal.
    Add permanent threads to thin panels in seconds. The knurls on these clinch-style nuts deform and grip sheet metal to create a permanent hold. Push them into a drilled or punched hole with an arbor press around your workpiece to install—no messy welding required.
    High-Temperature High-Strength A286 Stainless Steel—Our strongest press-fit nuts are hard enough to install in stainless steel panels. They also withstand temperatures up to 1150° F and resist corrosion from chemicals such as bleach and chlorine.
    Head
    Thread Size
    Drill Bit
    Size
    For Min.
    Panel Thk.
    For Maximum Panel
    Hardness
    OD
    Ht.
    PEM® Part
    No.
    Head
    Shape
    Pkg.
    Qty.
    Pkg.
     
    High-Temperature High-Strength A286 Stainless Steel
    2-56
    29 Ga.
    0.025"Brinell 192, Rockwell B900.22"0.065"SMPP-256Round1092002A11000000
    2-56
    19 Ga.
    0.03"Brinell 192, Rockwell B900.25"0.07"SP-256-0Round1092002A1700000
    2-56
    19 Ga.
    0.04"Brinell 192, Rockwell B900.25"0.07"SP-256-1Round1092002A1800000
    2-56
    19 Ga.
    0.056"Brinell 192, Rockwell B900.25"0.07"SP-256-2Round1092002A1900000
    4-40
    19 Ga.
    0.025"Brinell 192, Rockwell B900.22"0.065"SMPP-440Round1092002A1200000
    4-40
    19 Ga.
    0.03"Brinell 192, Rockwell B900.25"0.07"SP-440-0Round1092002A2100000
    4-40
    19 Ga.
    0.04"Brinell 192, Rockwell B900.25"0.07"SP-440-1Round1092002A2200000
    4-40
    19 Ga.
    0.056"Brinell 192, Rockwell B900.25"0.07"SP-440-2Round1092002A2300000
    6-32
    3/16"
    0.03"Brinell 192, Rockwell B900.28"0.07"SP-632-0Round1092002A2400000
    6-32
    3/16"
    0.04"Brinell 192, Rockwell B900.28"0.07"SP-632-1Round1092002A2500000
    6-32
    3/16"
    0.056"Brinell 192, Rockwell B900.28"0.07"SP-632-2Round1092002A2600000
    6-32
    12 Ga.
    0.025"Brinell 192, Rockwell B900.252"0.065"SMPP-632Round1092002A1300000
    8-32
    3 Ga.
    0.03"Brinell 192, Rockwell B900.31"0.09"SP-832-0Round592002A2700000
    8-32
    3 Ga.
    0.04"Brinell 192, Rockwell B900.31"0.09"SP-832-1Round592002A2800000
    8-32
    3 Ga.
    0.056"Brinell 192, Rockwell B900.31"0.09"SP-832-2Round592002A2900000
    10-24
    1/4"
    0.03"Brinell 192, Rockwell B900.34"0.09"SP-024-0Round592002A3100000
    10-24
    1/4"
    0.04"Brinell 192, Rockwell B900.34"0.09"SP-024-1Round592002A3200000
    10-24
    1/4"
    0.056"Brinell 192, Rockwell B900.34"0.09"SP-024-2Round592002A3300000
    10-32
    1/4"
    0.03"Brinell 192, Rockwell B900.34"0.09"SP-032-0Round592002A3400000
    10-32
    1/4"
    0.04"Brinell 192, Rockwell B900.34"0.09"SP-032-1Round592002A3500000
    10-32
    1/4"
    0.056"Brinell 192, Rockwell B900.34"0.09"SP-032-2Round592002A3600000
    1/4"-20
    11/32"
    0.047"Brinell 192, Rockwell B900.44"0.17"SP-0420-0Round192002A3700000
    1/4"-20
    11/32"
    0.056"Brinell 192, Rockwell B900.44"0.17"SP-0420-1Round192002A3800000
    1/4"-20
    11/32"
    0.09"Brinell 192, Rockwell B900.44"0.17"SP-0420-2Round192002A3900000
    5/16"-18
    Z
    0.056"Brinell 192, Rockwell B900.5"0.23"SP-0518-1Round192002A4100000
    5/16"-18
    Z
    0.09"Brinell 192, Rockwell B900.5"0.23"SP-0518-2Round192002A4200000
    3/8"-16
    1/2"
    0.09"Brinell 192, Rockwell B900.56"0.27"SP-0616-1Round192002A4300000
    3/8"-16
    1/2"
    0.125"Brinell 192, Rockwell B900.56"0.27"SP-0616-2Round192002A4400000
    M2 x 0.4 mm4.2 mm
    1 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M2-1Round592002A4500000
    M2 x 0.4 mm4.2 mm
    1.4 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M2-2Round592002A4600000
    M2.5 x 0.45 mm3.8 mm
    0.64 mmBrinell 192, Rockwell B905.6 mm1.4 mmSMPP-M2.5Round1092002A1400000
    M2.5 x 0.45 mm4.2 mm
    0.8 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M2.5-0Round592002A4700000
    M2.5 x 0.45 mm4.2 mm
    1 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M2.5-1Round592002A4800000
    M2.5 x 0.45 mm4.2 mm
    1.4 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M2.5-2Round592002A4900000
    M3 x 0.5 mm4.2 mm
    0.64 mmBrinell 192, Rockwell B905.6 mm1.4 mmSMPP-M3Round1092002A1500000
    M3 x 0.5 mm4.2 mm
    0.8 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M3-0Round1092002A5100000
    M3 x 0.5 mm4.2 mm
    1 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M3-1Round1092002A5200000
    M3 x 0.5 mm4.2 mm
    1.4 mmBrinell 192, Rockwell B906.35 mm1.5 mmSP-M3-2Round1092002A5300000
    M3.5 x 0.6 mm4.8 mm
    0.64 mmBrinell 192, Rockwell B906.4 mm1.4 mmSMPP-M3.5Round1092002A1600000
    M4 x 0.7 mm5.4 mm
    0.8 mmBrinell 192, Rockwell B907.87 mm2 mmSP-M4-0Round592002A5400000
    M4 x 0.7 mm5.4 mm
    1 mmBrinell 192, Rockwell B907.87 mm2 mmSP-M4-1Round592002A5500000
    M4 x 0.7 mm5.4 mm
    1.4 mmBrinell 192, Rockwell B907.87 mm2 mmSP-M4-2Round592002A5600000
    M5 x 0.8 mm6.4 mm
    0.8 mmBrinell 192, Rockwell B908.64 mm2 mmSP-M5-0Round592002A5700000
    M5 x 0.8 mm6.4 mm
    1 mmBrinell 192, Rockwell B908.64 mm2 mmSP-M5-1Round592002A5800000
    M5 x 0.8 mm6.4 mm
    1.4 mmBrinell 192, Rockwell B908.64 mm2 mmSP-M5-2Round592002A5900000
    M6 x 1 mm8.8 mm
    1.4 mmBrinell 192, Rockwell B9011.18 mm4.08 mmSP-M6-1Round192002A6100000
    M6 x 1 mm8.8 mm
    2.29 mmBrinell 192, Rockwell B9011.18 mm4.08 mmSP-M6-2Round192002A6200000
    M8 x 1.25 mm10.5 mm
    1.4 mmBrinell 192, Rockwell B9012.7 mm5.47 mmSP-M8-1Round192002A6300000
    M8 x 1.25 mm10.5 mm
    2.29 mmBrinell 192, Rockwell B9012.7 mm5.47 mmSP-M8-2Round192002A6400000
    M10 x 1.5 mm14 mm
    2.29 mmBrinell 192, Rockwell B9017.35 mm7.48 mmSP-M10-1Round192002A6500000
     

    Mil. Spec. Rivet-Mount Nuts

    Image of ProductInUse. Front orientation. Contains Annotated. Rivet-Mount Nuts.
    Image of Product. Front orientation. Rivet-Mount Nuts.
    Image of Attribute. Front orientation. Contains Annotated.
    Image of Attribute. Top orientation. Contains Annotated.
    Create threads in hard-to-work areas—where you can’t reach the back of a workpiece, or material is too thin to be tapped. For a strong grip, these rivet-mount nuts have distorted threads that increase friction with bolts. Because they mount with two rivets, they won’t spin when you’re tightening screws. However, these nuts do move inside their retainers, which lets you install bolts at a slight angle; use them to align with off-center parts. All meet military guidelines for dimensions and material.
    A286 Stainless Steel—A286 stainless steel nuts are corrosion resistant.
    Silver-Plated A286 Stainless Steel—Silver-plated stainless steel nuts withstand temperatures up to 800° F. The silver plating also adds lubricity and prevents seizing caused by friction between nuts and bolts.
    Lubricated—Lubricated nuts thread onto bolts smoothly.
    Base
    Barrel
    Mounting
    Thread
    Size
    Lg.
    Wd.
    Thk.
    Dia.
    Ht.
    No. of
    Holes
    Hole
    Dia.
    Hole
    Ctr.-to-Ctr.
    Mil. Spec.
    Each
    A286 Stainless Steel—Lubricated
    4-40
    21/32"5/16"3/32"1/8"1/16"20.098"13/32"MS21076L04N90857A141000000
    6-32
    11/16"11/32"3/32"0.172"5/64"20.098"7/16"MS21076L06N90857A14200000
    6-32
    61/64"13/32"1/32"0.172"11/64"20.098"11/16"MS21060L0690857A12000000
    8-32
    45/64"23/64"3/32"0.203"5/32"20.098"15/32"MS21076L08N90857A1430000
    8-32
    61/64"13/32"1/32"0.203"7/32"20.098"11/16"MS21060L0890857A1210000
    10-32
    47/64"13/32"3/32"0.234"5/32"20.098"1/2"MS21076L3N90857A1440000
    10-32
    61/64"13/32"1/32"0.234"7/32"20.098"11/16"MS21060L390857A1220000
    1/4"-28
    51/64"1/2"3/32"0.313"3/16"20.098"9/16"MS21076L4N90857A1450000
    1/4"-28
    1 19/64"33/64"1/32"0.313"1/4"20.098"1"MS21060L490857A12300000
    5/16"-24
    1 1/64"37/64"7/64"0.391"7/32"20.13"23/32"MS21076L5N90857A14600000
    5/16"-24
    1 19/64"39/64"3/64"3/8"9/32"20.13"1"MS21060L590857A12400000
    3/8"-24
    1 19/64"43/64"1/16"0.453"19/64"20.13"1"MS21060L690857A12500000
     
    Silver-Plated A286 Stainless Steel—Unlubricated
    4-40
    21/32"5/16"3/32"1/8"1/16"20.098"13/32"MS21076-04N90857A13600000
    6-32
    61/64"13/32"1/32"0.172"11/64"20.098"11/16"MS21060-0690857A11400000
    8-32
    45/64"23/64"3/32"0.203"5/32"20.098"15/32"MS21076-08N90857A13700000
    10-32
    47/64"13/32"3/32"0.234"5/32"20.098"1/2"MS21076-3N90857A1380000
    10-32
    61/64"13/32"1/32"0.234"7/32"20.098"11/16"MS21060-390857A1160000
    1/4"-28
    51/64"1/2"3/32"0.313"3/16"20.098"9/16"MS21076-4N90857A13900000
    1/4"-28
    1 19/64"33/64"1/32"0.313"1/4"20.098"1"MS21060-490857A11700000
    5/16"-24
    1 1/64"37/64"7/64"0.391"7/32"20.13"23/32"MS21076-5N90857A14000000
     
    back to top