McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    167 Products

    Nylon-Insert Locknuts
    3D CAD models available

    Versatile yet economical, these are the most commonly used locknuts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"5/16"SAE Grade 8
    2202500000000000000
    1/4"-28
    7/16"5/16"SAE Grade 8
    220250000000000000
    5/16"-18
    1/2"11/32"SAE Grade 8
    220200000000000000
    5/16"-24
    1/2"11/32"SAE Grade 8
    220200000000000000
    3/8"-16
    9/16"29/64"SAE Grade 8
    220200000000000000
    3/8"-24
    9/16"29/64"SAE Grade 8
    220200000000000000
    7/16"-14
    5/8"29/64"SAE Grade 8
    220100000000000000
    7/16"-20
    5/8"29/64"SAE Grade 8
    220100000000000000
    1/2"-13
    3/4"19/32"SAE Grade 8
    220100000000000000
    1/2"-20
    3/4"19/32"SAE Grade 8
    220100000000000000
    9/16"-12
    7/8"41/64"SAE Grade 8
    22050000000000000
    9/16"-18
    7/8"41/64"SAE Grade 8
    22050000000000000
    5/8"-11
    15/16"3/4"SAE Grade 8
    22050000000000000
    5/8"-18
    15/16"3/4"SAE Grade 8
    22050000000000000
    3/4"-10
    1 1/16"7/8"SAE Grade 8
    22050000000000000
    3/4"-16
    1 1/16"7/8"SAE Grade 8
    22050000000000000
    7/8"-9
    1 1/4"63/64"SAE Grade 8
    22010000000000000
    7/8"-14
    1 1/4"63/64"SAE Grade 8
    22010000000000000
    1"-8
    1 7/16"1 3/64"SAE Grade 8
    22010000000000000
    1"-12
    1 7/16"1 3/64"SAE Grade 8
    220500000000000000
    1"-14
    1 7/16"1 3/64"SAE Grade 8
    22010000000000000
    1 1/8"-7
    1 5/8"1 11/64"SAE Grade 8
    22010000000000000
    1 1/8"-12
    1 5/8"1 11/64"SAE Grade 8
    220100000000000000
    1 1/4"-7
    1 13/16"1 25/64"SAE Grade 8
    220100000000000000
    1 1/4"-8
    2 1/64"1 41/64"SAE Grade 8
    220100000000000000
    1 1/4"-12
    1 13/16"1 25/64"SAE Grade 8
    220100000000000000
    1 1/2"-6
    2 13/64"1 39/64"SAE Grade 8
    220100000000000000
    1 1/2"-8
    2 25/64"1 59/64"SAE Grade 8
    220100000000000000
    1 1/2"-12
    2 13/64"1 39/64"SAE Grade 8
    220100000000000000
    1 3/4"-5
    2 49/64"2 5/16"SAE Grade 8
    220100000000000000
    1 3/4"-8
    2 49/64"2 5/16"SAE Grade 8
    220100000000000000
    1 3/4"-12
    2 49/64"2 5/16"SAE Grade 8
    220100000000000000
    2"-4 1/2
    3 9/64"2 13/32"SAE Grade 8
    220100000000000000
    2"-12
    3 9/64"2 13/32"SAE Grade 8
    220100000000000000
    2 1/4"-8
    3 33/64"2 13/16"SAE Grade 8
    220100000000000000
     
    Medium-Strength Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M3 × 0.5 mm5.54ISO Class 8
    220DIN 985, ISO 10511100000000000000000
    M4 × 0.7 mm75ISO Class 8
    220DIN 985, ISO 1051110000000000000000
    M5 × 0.8 mm85ISO Class 8
    220DIN 985, ISO 1051110000000000000000
    M6 × 1 mm106ISO Class 8
    220DIN 985, ISO 1051110000000000000000
    M8 × 1.25 mm138ISO Class 8
    220DIN 985, ISO 1051110000000000000000
    M10 × 1.5 mm1710ISO Class 8
    220DIN 985, ISO 105115000000000000000
    M12 × 1.75 mm1912ISO Class 8
    220DIN 985, ISO 105112500000000000000
    M14 × 2 mm2214ISO Class 8
    220DIN 985, ISO 105112500000000000000
    M16 × 2 mm2416ISO Class 8
    220DIN 985, ISO 105111000000000000000
    M18 × 2.5 mm2718.5ISO Class 8
    220DIN 985, ISO 10511500000000000000
    M20 × 2.5 mm3020ISO Class 8
    220DIN 985, ISO 10511500000000000000
    M22 × 2.5 mm3222ISO Class 8
    220DIN 985, ISO 10511500000000000000
    M24 × 3 mm3624ISO Class 8
    220DIN 985, ISO 10511500000000000000
     

    Thin-Profile Nylon-Insert Locknuts
    3D CAD models available

    About half the height of standard-profile locknuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Thin-Profile Nylon-Insert Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"13/64"SAE Grade 8
    Not Rated10000000000000000
    1/4"-28
    7/16"13/64"SAE Grade 8
    250100000000000000
    5/16"-18
    1/2"1/4"SAE Grade 8
    Not Rated10000000000000000
    5/16"-24
    1/2"1/4"SAE Grade 8
    2501000000000000000
    3/8"-16
    9/16"17/64"SAE Grade 8
    Not Rated10000000000000000
    3/8"-24
    9/16"17/64"SAE Grade 8
    Not Rated5000000000000000
    7/16"-14
    5/8"5/16"SAE Grade 8
    Not Rated250000000000000
    7/16"-20
    5/8"5/16"SAE Grade 8
    Not Rated250000000000000
    1/2"-13
    3/4"5/16"SAE Grade 8
    Not Rated2500000000000000
    1/2"-20
    3/4"5/16"SAE Grade 8
    25050000000000000
    5/8"-11
    15/16"25/64"SAE Grade 8
    Not Rated100000000000000
    5/8"-18
    15/16"25/64"SAE Grade 8
    25050000000000000
    3/4"-16
    1 1/16"13/32"SAE Grade 8
    25010000000000000
    7/8"-14
    1 1/4"15/32"SAE Grade 8
    25010000000000000
    1"-14
    1 7/16"35/64"SAE Grade 8
    25010000000000000
    1 1/4"-12
    1 13/16"3/4"SAE Grade 8
    Not Rated100000000000000
    1 1/2"-12
    2 3/16"51/64"SAE Grade 8
    Not Rated100000000000000
     

    Heavy-Profile Nylon-Insert Locknuts
    3D CAD models available

    About 10% wider and taller than standard-profile locknuts, these handle heavier loads by distributing them over a larger area. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Heavy-Profile Nylon-Insert Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1"-8
    1 5/8"1 9/32"SAE Grade 8
    220100000000000000
    1 1/4"-7
    2 1/64"1 41/64"SAE Grade 8
    220100000000000000
    1 1/2"-6
    2 25/64"1 59/64"SAE Grade 8
    220100000000000000
     

    High-Profile Nylon-Insert Locknuts
    3D CAD models available

    Slightly taller than standard-profile locknuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    Medium-Strength Steel
    Image of Product. Front orientation. Locknuts. High-Profile Nylon-Insert Locknuts.
    These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M5 × 0.8 mm86.3ISO Class 8
    220DIN 982, ISO 7040100000000000000000
    M6 × 1 mm108ISO Class 8
    220DIN 982, ISO 704010000000000000000
    M8 × 1.25 mm139.5ISO Class 8
    220DIN 982, ISO 704010000000000000000
    M10 × 1.5 mm1711.5ISO Class 8
    220DIN 982, ISO 70405000000000000000
    M12 × 1.75 mm1914ISO Class 8
    220DIN 982, ISO 70402500000000000000
    M16 × 2 mm2418ISO Class 8
    220DIN 982, ISO 70401000000000000000
    M20 × 2.5 mm3222ISO Class 8
    220DIN 982, ISO 7040500000000000000
    M24 × 3 mm3628ISO Class 8
    220DIN 982, ISO 704010000000000000
     

    Top-Lock Distorted-Thread Locknuts
    3D CAD models available

    Irregularly shaped threads at the top of these locknuts grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Top-Lock Distorted-Thread Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"7/32"ASTM Grade C
    5000000000000000
    1/4"-28
    7/16"7/32"ASTM Grade C
    500000000000000
    5/16"-18
    1/2"17/64"ASTM Grade C
    500000000000000
    5/16"-24
    1/2"17/64"ASTM Grade C
    500000000000000
    3/8"-16
    9/16"21/64"ASTM Grade C
    250000000000000
    3/8"-24
    9/16"21/64"ASTM Grade C
    250000000000000
    7/16"-14
    11/16"3/8"ASTM Grade C
    250000000000000
    7/16"-20
    11/16"3/8"ASTM Grade C
    250000000000000
    1/2"-13
    3/4"7/16"ASTM Grade C
    100000000000000
    1/2"-20
    3/4"7/16"ASTM Grade C
    100000000000000
    9/16"-12
    7/8"31/64"ASTM Grade C
    100000000000000
    9/16"-18
    7/8"31/64"ASTM Grade C
    100000000000000
    5/8"-11
    15/16"35/64"ASTM Grade C
    50000000000000
    5/8"-18
    15/16"35/64"ASTM Grade C
    50000000000000
    3/4"-10
    1 1/8"41/64"ASTM Grade C
    50000000000000
    3/4"-16
    1 1/8"41/64"ASTM Grade C
    50000000000000
    7/8"-9
    1 5/16"3/4"ASTM Grade C
    10000000000000
    7/8"-14
    1 5/16"3/4"ASTM Grade C
    10000000000000
    1"-8
    1 1/2"55/64"ASTM Grade C
    10000000000000
    1"-14
    1 1/2"55/64"ASTM Grade C
    10000000000000
    M6 × 1 mm10 mm6 mmISO Class 10
    10000000000000000
    M8 × 1 mm13 mm8 mmISO Class 10
    100000000000000
    M8 × 1.25 mm13 mm8 mmISO Class 10
    5000000000000000
    M10 × 1.25 mm17 mm10 mmISO Class 10
    100000000000000
    M10 × 1.5 mm17 mm10 mmISO Class 10
    2500000000000000
    M12 × 1.25 mm19 mm12 mmISO Class 10
    500000000000000
    M12 × 1.5 mm19 mm12 mmISO Class 10
    500000000000000
    M12 × 1.75 mm19 mm12 mmISO Class 10
    100000000000000
    M14 × 1.5 mm22 mm14 mmISO Class 10
    500000000000000
    M14 × 2 mm22 mm14 mmISO Class 10
    100000000000000
    M16 × 1.5 mm24 mm16 mmISO Class 10
    10000000000000
    M16 × 2 mm24 mm16 mmISO Class 10
    1000000000000000
    M18 × 2.5 mm27 mm18 mmISO Class 10
    500000000000000
    M20 × 2.5 mm30 mm20 mmISO Class 10
    500000000000000
    M24 × 3 mm36 mm24 mmISO Class 10
    10000000000000
     
    Medium-Strength Steel
    Image of Product. Front orientation. Locknuts. Top-Lock Distorted-Thread Locknuts.
    These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M36 × 4 mm5536ISO Class 8
    DIN 980V100000000000000
     

    Center-Lock Distorted-Thread Locknuts
    3D CAD models available

    Also known as reversible locknuts, these thread on from either side, so you don't have to worry about fastening them incorrectly and damaging your screw. The irregularly shaped threads in the middle grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Center-Lock Distorted-Thread Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"7/32"SAE Grade 8
    50000000000000000
    1/4"-28
    7/16"7/32"SAE Grade 8
    5000000000000000
    5/16"-18
    1/2"17/64"SAE Grade 8
    5000000000000000
    5/16"-24
    1/2"17/64"SAE Grade 8
    5000000000000000
    3/8"-16
    9/16"21/64"SAE Grade 8
    250000000000000
    3/8"-24
    9/16"21/64"SAE Grade 8
    2500000000000000
    7/16"-14
    11/16"3/8"SAE Grade 8
    100000000000000
    7/16"-20
    11/16"3/8"SAE Grade 8
    100000000000000
    1/2"-13
    3/4"7/16"SAE Grade 8
    100000000000000
    1/2"-20
    3/4"7/16"SAE Grade 8
    1000000000000000
    9/16"-12
    7/8"31/64"SAE Grade 8
    1000000000000000
    5/8"-11
    15/16"35/64"SAE Grade 8
    50000000000000
    5/8"-18
    15/16"35/64"SAE Grade 8
    50000000000000
    3/4"-10
    1 1/8"41/64"SAE Grade 8
    50000000000000
    3/4"-16
    1 1/8"41/64"SAE Grade 8
    500000000000000
    7/8"-9
    1 5/16"3/4"SAE Grade 8
    500000000000000
    1"-8
    1 1/2"55/64"SAE Grade 8
    10000000000000
    1"-14
    1 1/2"55/64"SAE Grade 8
    100000000000000
     

    Heavy-Profile Steel-Insert Locknuts for Extreme Vibration
    3D CAD models available

    Nearly 10% wider and taller than standard steel-insert locknuts, these handle heavier loads by distributing them over a larger area. They also have the most secure hold of all the heavy-profile locknuts we offer. The tab on the insert stops the nut from rotating, even under extreme vibration. These locknuts are ideal for equipment with constant motion or jarring starts and stops, including conveyors, shakers, and compactors. In fact, they're so secure that they're even used to fasten components on roller coasters. These locknuts are also reusable, but their holding power decreases after the first use, so you should use a new nut for the strongest possible hold.
    High-Strength Steel
    Image of Product. Bottom orientation. Locknuts. Heavy-Profile Steel-Insert Locknuts for Extreme Vibration.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Thread
    Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Each
    Zinc-Yellow-Chromate-Plated Steel
    1/2"-13
    7/8"19/32"SAE Grade 8
    00000000000000
    5/8"-11
    1 1/16"47/64"SAE Grade 8
    0000000000000
    3/4"-10
    1 1/4"57/64"SAE Grade 8
    0000000000000
    1"-8
    1 5/8"1 11/64"SAE Grade 8
    00000000000000
     

    Serrated Flange Nuts
    3D CAD models available

    Serrations bite into material for mild vibration resistance while the flange eliminates the need for a separate washer. These nuts are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can use them again and again without sacrificing strength. However, the serrations may mar the surface of your material. Also known as collar nuts.
    Medium-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.
    Rated Grade 5, Grade F, or Class 8, these nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Flange,
    mm
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M4 × 0.7 mm74.210.50.9ISO Class 8
    DIN 6923, ISO 416150000000000000000
    M5 × 0.8 mm8511.81ISO Class 8
    DIN 6923, ISO 41615000000000000000
    M6 × 1 mm10614.21.1ISO Class 8
    DIN 6923, ISO 416110000000000000000
    M8 × 1.25 mm13817.91.2ISO Class 8
    DIN 6923, ISO 41615000000000000000
    M10 × 1.25 mm151021.81.5ISO Class 8
    DIN 69235000000000000000
    M10 × 1.5 mm151021.81.5ISO Class 8
    DIN 6923, ISO 41612500000000000000
    M12 × 1.75 mm1812261.8ISO Class 8
    DIN 6923, ISO 41611000000000000000
    M14 × 2 mm211429.92.1ISO Class 8
    DIN 69232500000000000000
    M16 × 2 mm241634.52.4ISO Class 8
    DIN 6923, ISO 416110000000000000
     
    High-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.
    Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Flange
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    9/16"-12
    7/8"1/2"1 3/16"0.05"SAE Grade 8
    500000000000000
     

    Nylon-Insert Flange Nuts
    3D CAD models available

    A nylon insert grips the screw for a stronger hold than a serrated flange, without damaging threads or marring the surface of your material. However, the insert may become brittle if exposed to high temperatures. These nuts have a flange that distributes pressure evenly across the mounting surface, so you don't need a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can reuse them a handful of times, but their holding power will decrease with each use. Also known as collar nuts.
    High-Strength Steel
    Image of Product. Front orientation. Flange Nuts. Nylon-Insert Flange Nuts.
    Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Flange
    Thread Size
    Wd.
    Ht.
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Specs.
    Met
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"19/64"0.56"0.04"ASME Grade G
    __25010000000000000000
    5/16"-18
    1/2"11/32"0.68"0.05"ASME Grade G
    __250500000000000000
    3/8"-16
    9/16"13/32"0.81"0.06"ASME Grade G
    __2505000000000000000
    1/2"-13
    3/4"35/64"1.07"0.08"ASME Grade G
    __2502500000000000000
    5/8"-11
    15/16"43/64"1.33"0.1"ASME Grade G
    __2501000000000000000
    M6 × 1 mm10 mm9.1 mm14.2 mm1.1 mmISO Class 10
    DIN 69262505000000000000000
    M8 × 1.25 mm13 mm11 mm17.9 mm1.2 mmISO Class 10
    DIN 69262505000000000000000
    M10 × 1.5 mm15 mm13.5 mm21.8 mm1.5 mmISO Class 10
    DIN 69262502500000000000000
    M12 × 1.75 mm18 mm16.1 mm26 mm1.8 mmISO Class 10
    DIN 69262502500000000000000
    M14 × 2 mm21 mm18.2 mm29.9 mm2.1 mmISO Class 10
    DIN 69262501000000000000000
    M16 × 2 mm24 mm20.3 mm34.5 mm2.4 mmISO Class 10
    DIN 6926250500000000000000
    M20 × 2.5 mm30 mm24.8 mm42.8 mm3 mmISO Class 10
    DIN 692625010000000000000
     

    Distorted-Thread Flange Nuts
    3D CAD models available

    The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration, but they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch, so they are not reusable. Nuts have a flange that distributes pressure evenly across the mounting surface without the need for a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.
    High-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Distorted-Thread Flange Nuts.
    Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Flange
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"19/64"9/16"0.04"ASME Grade G
    50000000000000000
    1/4"-28
    7/16"19/64"9/16"0.04"ASME Grade G
    5000000000000000
    5/16"-18
    1/2"23/64"11/16"0.05"ASME Grade G
    2500000000000000
    5/16"-24
    1/2"23/64"11/16"0.05"ASME Grade G
    2500000000000000
    3/8"-16
    9/16"27/64"13/16"0.06"ASME Grade G
    2500000000000000
    3/8"-24
    9/16"27/64"13/16"0.06"ASME Grade G
    2500000000000000
    1/2"-13
    3/4"9/16"1 1/16"0.08"ASME Grade G
    100000000000000
    1/2"-20
    3/4"9/16"1 1/16"0.08"ASME Grade G
    1000000000000000
    5/8"-11
    15/16"11/16"1 21/64"0.1"ASME Grade G
    1000000000000000
    5/8"-18
    15/16"11/16"1 21/64"0.1"ASME Grade G
    1000000000000000
    3/4"-10
    1 1/8"13/16"1 37/64"0.11"ASME Grade G
    500000000000000
     
    back to top