Thread Size Thread Size |
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Material Material |
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Finish Finish |
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Nut Type Nut Type | Show |
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 | Locknut |
Locking Type Locking Type | Show |
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 | Cotter Pin |
Locking Type Locking Type | Hide |
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| Nylon Insert | Serrations |
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| Distorted Thread | Lock Washer |
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| Flex-Top | Cotter Pin |
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| Steel Insert | Thread Forming |
Width Width |
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Height Height |
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Thread Spacing Thread Spacing |
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For Cotter Pin Diameter For Cotter Pin Diameter |
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Hex Nut Profile Hex Nut Profile |
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 | Standard |
Thread Direction Thread Direction |
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Minimum Slot Width Minimum Slot Width |
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Minimum Slot Depth Minimum Slot Depth |
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Drive Style Drive Style |
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 | External Hex |
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Specifications Met Specifications Met |
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About Nuts, Materials, and Finishes
More
Low-Strength Steel Locknuts for use with Cotter Pins
Secure these hex slotted nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 25 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
Zinc-Plated Steel | ||||||||
| 1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 50 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 3/32" | 0.12" | 0.155" | 25 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 3/32" | 0.12" | 0.155" | 25 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 1/8" | 0.15" | 0.148" | 25 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 1/8" | 0.15" | 0.148" | 25 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 31/64" | 7/64" | 0.15" | 0.163" | 10 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 7/64" | 0.15" | 0.163" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 5/32" | 0.18" | 0.219" | 10 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 21/32" | 5/32" | 0.18" | 0.265" | 10 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 21/32" | 5/32" | 0.18" | 0.265" | 10 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 5/32" | 0.18" | 0.204" | 5 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 3/4" | 5/32" | 0.18" | 0.204" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 5 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 5 | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 1 3/32" | 9/32" | 0.31" | 0.297" | 1 | 000000000 | 0000 |
| 1 1/4"-12 | 1 7/8" | 1 1/16" | 9/32" | 0.31" | 0.33" | 1 | 000000000 | 0000 |
| 1 1/2"-6 | 2 1/4" | 1 5/16" | 5/16" | 0.37" | 0.457" | 1 | 000000000 | 0000 |
| 1 1/2"-12 | 2 1/4" | 1 5/16" | 5/16" | 0.37" | 0.457" | 1 | 000000000 | 0000 |
| 1 3/4"-5 | 2 5/8" | 1 1/2" | 3/8" | 0.43" | 0.44" | 1 | 000000000 | 00000 |
| 1 3/4"-12 | 2 5/8" | 1 1/2" | 3/8" | 0.43" | 0.44" | 1 | 000000000 | 00000 |
| 2"-4 1/2 | 3" | 1 23/32" | 3/8" | 0.43" | 0.485" | 1 | 000000000 | 00000 |
| 2"-12 | 3" | 1 23/32" | 3/8" | 0.43" | 0.485" | 1 | 000000000 | 00000 |
Metric Medium-Strength Steel Locknuts
for use with Cotter Pins—Class 8
Often referred to as castle nuts, secure these by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
Zinc-plated steel locknuts resist corrosion in wet environments.
Steel locknuts are best for dry environments, since moisture will cause them to rust. They are weldable and can be painted or finished.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | For Cotter Pin Dia., mm | Min. Slot Wd., mm | Min. Slot Dp., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||||
| M6 | 1 | 10 | 7.5 | 1.6 | 2 | 2.5 | DIN 935 | 5 | 000000000 | 00000 |
| M8 | 1.25 | 13 | 9.5 | 2 | 2.5 | 3 | DIN 935 | 5 | 000000000 | 0000 |
| M10 | 1.5 | 17 | 12 | 2.5 | 2.8 | 4 | DIN 935 | 5 | 000000000 | 0000 |
| M12 | 1.5 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 5 | 000000000 | 0000 |
| M12 | 1.75 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 5 | 000000000 | 0000 |
| M14 | 1.5 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 1.5 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 10 | 000000000 | 00000 |
| M16 | 2 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 5 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 21 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 22 | 4 | 4.5 | 6 | DIN 935 | 5 | 000000000 | 00000 |
| M24 | 2 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M24 | 3 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M27 | 3 | 41 | 30 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 00000 |
| M30 | 3.5 | 46 | 33 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
Steel—Class 8 | ||||||||||
| M12 | 1.5 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 10 | 000000000 | 0000 |
| M14 | 1.5 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 1.5 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 2 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 21 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 22 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M24 | 3 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M30 | 3.5 | 46 | 33 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M36 | 3 | 55 | 38 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M36 | 4 | 55 | 38 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M42 | 4.5 | 65 | 46 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
| M48 | 5 | 75 | 50 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
| M56 | 5.5 | 85 | 57 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5
Secure these hex slotted nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included. They're zinc plated to resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 25 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 10 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 7/64" | 0.12" | 0.135" | 25 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 7/64" | 0.12" | 0.135" | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 7/64" | 0.15" | 0.137" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 7/64" | 0.15" | 0.137" | 10 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 31/64" | 9/64" | 0.15" | 0.163" | 10 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 9/64" | 0.15" | 0.163" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | 5/32" | 0.18" | 0.217" | 5 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 5/32" | 0.18" | 0.217" | 5 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 49/64" | 3/16" | 0.18" | 0.204" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
| 1 1/4"-7 | 1 7/8" | 1 3/32" | 5/16" | 0.31" | 0.33" | 1 | 000000000 | 0000 |
| 1 1/4"-12 | 1 7/8" | 1 3/32" | 5/16" | 0.31" | 0.33" | 1 | 000000000 | 0000 |
Stainless Steel Locknuts for use with Cotter Pins
These locknuts have good chemical resistance and may be mildly magnetic. Also known as castle nuts, secure them by inserting a cotter pin or safety wire through the slots in the nut and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 10-32 | 3/8" | 1/4" | 3/64" | 0.06" | 0.09" | 5 | 000000000 | 000000 |
| 1/4"-20 | 7/16" | 9/32" | 1/16" | 0.07" | 0.09" | 5 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 9/32" | 1/16" | 0.07" | 0.09" | 5 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 21/64" | 5/64" | 0.09" | 0.09" | 5 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 21/64" | 5/64" | 0.09" | 0.09" | 5 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 13/32" | 3/32" | 0.12" | 0.13" | 1 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 13/32" | 3/32" | 0.12" | 0.13" | 1 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 9/16" | 1/8" | 0.15" | 0.15" | 1 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 9/16" | 1/8" | 0.15" | 0.15" | 1 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 23/32" | 5/32" | 0.18" | 0.21" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 23/32" | 5/32" | 0.18" | 0.21" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 13/16" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 13/16" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 29/32" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 1" | 3/16" | 0.24" | 0.28" | 1 | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 1 1/4" | 7/32" | 0.31" | 0.37" | 1 | 000000000 | 00000 |
| 1 1/2"-6 | 2 1/4" | 1 1/2" | 1/4" | 0.37" | 0.43" | 1 | 000000000 | 00000 |