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Locking Type Locking Type |
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| Nylon Insert | Serrations |
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| Cotter Pin | Distorted Thread |
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| Steel Insert |
Finish Finish |
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Hex Nut Profile Hex Nut Profile |
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| Standard | Extra Wide |
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| Thin |
Height Height |
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Width Width |
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Thread Spacing Thread Spacing |
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About Nuts, Materials, and Finishes
More
Medium-Strength Steel Nylon-Insert Locknuts—Grade 5
A nylon insert grips the bolt to resist loosening without damaging threads. These locknuts are reusable, but their holding power lessens with each use. They are suitable for fastening most machinery and equipment. 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. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | ||||||
|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 5/16" | 220° | 100 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 5/16" | 220° | 100 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 11/32" | 220° | 100 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 11/32" | 220° | 100 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 29/64" | 220° | 100 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 29/64" | 220° | 100 | 000000000 | 0000 |
| 7/16"-14 | 5/8" | 29/64" | 220° | 100 | 000000000 | 00000 |
| 7/16"-20 | 5/8" | 29/64" | 220° | 100 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 19/32" | 220° | 50 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 19/32" | 220° | 50 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 41/64" | 220° | 25 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 41/64" | 220° | 25 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 3/4" | 220° | 25 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 3/4" | 220° | 25 | 000000000 | 00000 |
| 3/4"-10 | 1 1/16" | 7/8" | 220° | 10 | 000000000 | 0000 |
| 3/4"-16 | 1 1/16" | 7/8" | 220° | 10 | 000000000 | 0000 |
| 7/8"-9 | 1 1/4" | 63/64" | 220° | 5 | 000000000 | 0000 |
| 7/8"-14 | 1 1/4" | 63/64" | 220° | 5 | 000000000 | 0000 |
| 1"-8 | 1 7/16" | 1 3/64" | 220° | 5 | 000000000 | 0000 |
| 1"-14 | 1 7/16" | 1 3/64" | 220° | 5 | 000000000 | 0000 |
| 1 1/8"-7 | 1 5/8" | 1 11/64" | 220° | 5 | 000000000 | 00000 |
| 1 1/4"-7 | 1 13/16" | 1 25/64" | 220° | 1 | 000000000 | 0000 |
Medium-Strength Steel Thin Nylon-Insert Locknuts
Half the height of standard nylon-insert locknuts, use these locknuts in low-clearance applications or jam one against a hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. These nuts are suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut. All have a finish that resists corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | ||||||
|---|---|---|---|---|---|---|
| 5/8"-11 | 15/16" | 25/64" | 220° | 5 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 25/64" | 220° | 5 | 000000000 | 0000 |
| 3/4"-10 | 1 1/16" | 13/32" | 220° | 5 | 000000000 | 00000 |
| 3/4"-16 | 1 1/16" | 13/32" | 220° | 10 | 000000000 | 00000 |
| 7/8"-14 | 1 1/4" | 15/32" | 220° | 1 | 000000000 | 0000 |
| 1"-8 | 1 7/16" | 35/64" | 220° | 1 | 000000000 | 0000 |
| 1"-14 | 1 7/16" | 35/64" | 220° | 1 | 000000000 | 0000 |
| 1 1/8"-7 | 1 5/8" | 41/64" | 220° | 1 | 000000000 | 00000 |
| 1 1/4"-7 | 1 13/16" | 3/4" | 220° | 1 | 000000000 | 00000 |
| 1 1/4"-12 | 1 7/8" | 3/4" | 220° | 1 | 000000000 | 00000 |
| 1 1/2"-6 | 2 3/16" | 51/64" | 220° | 1 | 000000000 | 00000 |
Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5
Also known as castle nuts, secure these 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 |
| 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 |
| 7/16"-14 | 11/16" | 3/8" | 7/64" | 0.12" | 0.135" | 25 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 7/64" | 0.15" | 0.137" | 10 | 000000000 | 0000 |
| 5/8"-11 | 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 |
| 1"-8 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Grade 5
These locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Made from Grade 5 steel, they're suitable for fastening most machinery and equipment.
Black-oxide locknuts are mildly corrosion resistant in dry environments and blend in with dark surfaces.
Zinc-plated locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Grade 5 | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 1/4" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 1/4" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 3/8" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 3/8" | 50 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 27/64" | 25 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 27/64" | 25 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 1/2" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 1/2" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 5/8" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 5/8" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 3/4" | 5 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 13/16" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 13/16" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 15/16" | 1 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 15/16" | 1 | 000000000 | 0000 |
Zinc-Plated Steel—Grade 5 | |||||
| 1/4"-20 | 7/16" | 1/4" | 100 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 1/4" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 3/8" | 50 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 3/8" | 50 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 27/64" | 50 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 27/64" | 25 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 1/2" | 25 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 1/2" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 5/8" | 10 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 5/8" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 3/4" | 10 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 13/16" | 5 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 13/16" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 15/16" | 5 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 15/16" | 1 | 000000000 | 0000 |
Thin Steel-Insert Locknuts for Extreme Vibration
About two-thirds the height of standard steel-insert locknuts, use these in low-clearance applications or jam one against a hex nut to hold it in place. When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. They're often used in shakers and vibrating equipment. The strength of the bolt should match the strength of the nut to prevent damaging threads. Made from Grade 5 steel, these nuts are suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Each | |
Steel—Grade 5 | ||||
|---|---|---|---|---|
| 1/2"-13 | 3/4" | 3/8" | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 3/8" | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 15/32" | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 15/32" | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 9/16" | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 9/16" | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 19/32" | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 19/32" | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 23/32" | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 23/32" | 000000000 | 00000 |
| 1 1/8"-12 | 1 11/16" | 3/4" | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 7/8" | 000000000 | 00000 |
| 1 1/4"-12 | 1 7/8" | 7/8" | 000000000 | 00000 |
| 1 1/2"-6 | 2 1/4" | 1" | 000000000 | 00000 |
| 1 1/2"-12 | 2 1/4" | 1" | 000000000 | 00000 |
Steel-Insert Locknuts for Extreme Vibration—Grade 5
When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. These locknuts are often used in shakers and vibrating equipment. The strength of the bolt should match the strength of the nut to prevent damaging threads. Made from Grade 5 steel, they're suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Each | |
Steel—Grade 5 | ||||
|---|---|---|---|---|
| 1/2"-13 | 3/4" | 1/2" | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 1/2" | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 5/8" | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 5/8" | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 3/4" | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 3/4" | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 7/8" | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 7/8" | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 1" | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 1" | 000000000 | 00000 |
| 1 1/8"-12 | 1 11/16" | 1 1/8" | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 1 1/4" | 000000000 | 00000 |
| 1 1/2"-6 | 2 1/4" | 1 1/2" | 000000000 | 00000 |
| 1 1/2"-12 | 2 1/4" | 1 1/2" | 000000000 | 00000 |
| 1 3/4"-12 | 2 5/8" | 1 3/4" | 000000000 | 00000 |
| 2"-12 | 3" | 2" | 000000000 | 00000 |
| 1 1/4"-12 | 1 7/8" | 1 1/4" | 000000000 | 00000 |
Medium-Strength Steel Extra-Wide Steel-Insert
Locknuts for Extreme Vibration—Grade 5
These locknuts are about 10% wider and taller than standard steel-insert locknuts. They distribute the load over a large area. When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. They're often used in shakers and vibrating equipment. The strength of the bolt should match the strength of the nut to prevent damaging threads. Made from Grade 5 steel, they're suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
Medium-Strength Steel Serrated
Flange Locknuts—Grade 5
These flange locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. Made from Grade 5 steel, they're suitable for fastening most machinery and equipment. A zinc plating provides corrosion resistance in wet environments. Height includes the flange.
For technical drawings and 3-D models, click on a part number.
Flange | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size | Wd. | Ht. | Dia. | Thick. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | |||||||
| 1/4"-20 | 7/16" | 15/64" | 19/32" | 0.04" | 100 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 15/64" | 19/32" | 0.04" | 100 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 9/32" | 11/16" | 0.04" | 100 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 9/32" | 11/16" | 0.04" | 100 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 11/32" | 3/4" | 0.04" | 100 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 11/32" | 3/4" | 0.04" | 100 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 29/64" | 1 1/32" | 0.05" | 50 | 000000000 | 00000 |
Nylon-Insert Cap Locknuts
The nylon cap covers and grips the threads to resist loosening. They’re reusable, but their holding power lessens with each use. Nuts are steel with a nylon 6/6 cap and insert.
Zinc-plated nuts have a layer of zinc that protects the steel from rust in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
|---|---|---|---|---|---|---|---|
| Size | Dp. | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | |||||||
| 3/8"-24 | 21/64" | 9/16" | 5/8" | 250° | 10 | 000000000 | 00000 |