Thread Size Thread Size |
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Locking Type Locking Type |
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 |  |
| Distorted Thread | Nylon Insert |
Finish Finish |
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Hex Nut Profile Hex Nut Profile |
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 |  |
| Standard | Extra-Wide Thin |
Width Width |
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Height Height |
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Thread Spacing Thread Spacing |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Nuts, Materials, and Finishes
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High-Strength Steel Top-Lock Distorted-Thread Locknuts
An irregularly shaped thread at the top of the nut 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. Comparable in strength to Grade 8 bolts, they're about 25% stronger than medium-strength steel locknuts.
Steel locknuts without a finish are ready to be painted or finished.
Black-oxide locknuts are mildly corrosion resistant in dry environments and blend in with dark surfaces.
Black-phosphate, zinc-plated, and zinc yellow-chromate plated locknuts resist corrosion in wet environments.
Zinc-aluminum coated locknuts are more corrosion resistant in wet environments than zinc-plated and zinc yellow-chromate plated locknuts.
Cadmium-plated locknuts resist corrosion in wet environments and have good lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade C | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 100 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 100 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 100 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 100 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 25 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 10 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 10 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 55/64" | 5 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
Black-Oxide Steel—Grade C | |||||
| 1/4"-20 | 7/16" | 7/32" | 50 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 7/32" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 50 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 50 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 10 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 31/64" | 10 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 10 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | 5 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 41/64" | 5 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 1 | 000000000 | 0000 |
Zinc-Plated Steel—Grade C | |||||
| 1/4"-20 | 7/16" | 7/32" | 100 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 7/32" | 100 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 50 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 25 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 10 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 10 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 55/64" | 5 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
| 1 1/8"-7 | 1 11/16" | 1" | 1 | 000000000 | 0000 |
| 1 1/8"-12 | 1 11/16" | 1" | 1 | 000000000 | 0000 |
| 1 1/4"-7 | 1 7/8" | 1 3/32" | 1 | 000000000 | 0000 |
| 1 1/4"-12 | 1 7/8" | 1 3/32" | 1 | 000000000 | 0000 |
| 1 1/2"-6 | 2 1/4" | 1 5/16" | 1 | 000000000 | 0000 |
| 1 1/2"-12 | 2 1/4" | 1 5/16" | 1 | 000000000 | 0000 |
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate Plated Steel—Grade C | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 50 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 50 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 25 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 25 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 31/64" | 10 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | 5 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 5 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 1 | 000000000 | 0000 |
Zinc-Aluminum Coated Steel—Grade C | |||||
| 1/4"-20 | 7/16" | 7/32" | 25 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 5 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 5 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 5 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 1 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | 1 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 3/4" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 1 | 000000000 | 00000 |
Cadmium-Plated Steel—Grade C | |||||
| 1/4"-20 | 7/16" | 7/32" | 100 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 7/32" | 100 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 50 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 10 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 41/64" | 10 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 3/4" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | ||||||
| M5 | 0.8 | 8 | 5.1 | 100 | 000000000 | 00000 |
| M6 | 1 | 10 | 6 | 100 | 000000000 | 0000 |
| M8 | 1 | 13 | 8 | 50 | 000000000 | 00000 |
| M8 | 1.25 | 13 | 8 | 50 | 000000000 | 0000 |
| M10 | 1 | 17 | 10 | 25 | 000000000 | 00000 |
| M10 | 1.5 | 17 | 10 | 25 | 000000000 | 0000 |
| M12 | 1.25 | 19 | 12 | 25 | 000000000 | 00000 |
| M12 | 1.75 | 19 | 12 | 25 | 000000000 | 00000 |
| M14 | 1.5 | 22 | 14 | 10 | 000000000 | 0000 |
| M14 | 2 | 22 | 14 | 10 | 000000000 | 0000 |
| M16 | 1.5 | 24 | 16 | 10 | 000000000 | 0000 |
| M16 | 2 | 24 | 16 | 10 | 000000000 | 0000 |
| M18 | 1.5 | 27 | 18 | 5 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 18 | 5 | 000000000 | 0000 |
| M20 | 1.5 | 30 | 20 | 5 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 20 | 5 | 000000000 | 0000 |
| M22 | 1.5 | 32 | 22 | 5 | 000000000 | 00000 |
| M22 | 2.5 | 32 | 22 | 5 | 000000000 | 00000 |
| M24 | 1.5 | 36 | 24 | 1 | 000000000 | 0000 |
| M24 | 3 | 36 | 24 | 1 | 000000000 | 0000 |
| M27 | 3 | 41 | 27 | 1 | 000000000 | 0000 |
| M30 | 2 | 46 | 30 | 1 | 000000000 | 0000 |
| M30 | 3.5 | 46 | 30 | 1 | 000000000 | 0000 |
| M36 | 3 | 55 | 36 | 1 | 000000000 | 0000 |
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate Plated Steel—Class 10 | ||||||
| M6 | 1 | 10 | 6 | 100 | 000000000 | 000000 |
| M8 | 1.25 | 13 | 8 | 50 | 000000000 | 0000 |
| M10 | 1.25 | 17 | 10 | 10 | 000000000 | 0000 |
| M10 | 1.5 | 17 | 10 | 25 | 000000000 | 0000 |
| M12 | 1.25 | 19 | 12 | 5 | 000000000 | 00000 |
| M12 | 1.75 | 19 | 12 | 10 | 000000000 | 0000 |
| M14 | 2 | 22 | 14 | 10 | 000000000 | 0000 |
| M16 | 2 | 24 | 16 | 10 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 18 | 5 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 20 | 5 | 000000000 | 0000 |
| M24 | 3 | 36 | 24 | 1 | 000000000 | 0000 |
| M30 | 3.5 | 46 | 30 | 1 | 000000000 | 0000 |
High-Strength Steel Extra-Wide Thin Nylon-Insert Locknuts
About half the height and 10% wider than standard nylon-insert locknuts, use these in low-clearance applications or jam one against an extra-wide 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. Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.
Steel locknuts without a finish are ready to be welded, painted and finished.
Black-phosphate steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Each | |
Steel—Grade C | |||||
|---|---|---|---|---|---|
| 1 1/8"-12 | 1 7/8" | 1" | 250° | 000000000 | 000000 |
| 1 3/8"-12 | 2 13/64" | 1 3/16" | 250° | 000000000 | 00000 |
Black-Phosphate Steel—Grade C | |||||
| 1 1/4"-12 | 2" | 1 7/64" | 250° | 000000000 | 0000 |
| 1 1/2"-12 | 2 3/8" | 1 5/16" | 250° | 000000000 | 0000 |
| 1 3/4"-12 | 2 3/4" | 1 15/32" | 250° | 000000000 | 00000 |
| 2"-12 | 3 1/8" | 1 43/64" | 250° | 000000000 | 00000 |
| 2 1/4"-12 | 3 1/2" | 1 15/16" | 250° | 000000000 | 00000 |
| 2 1/2"-12 | 4" | 2 3/16" | 250° | 000000000 | 00000 |
| 2 3/4"-12 | 4" | 2 3/16" | 250° | 000000000 | 00000 |
| 3"-12 | 4 1/2" | 2 41/64" | 250° | 000000000 | 000000 |