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About Nuts, Materials, and Finishes
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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" | 9/32" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 1/4" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 21/64" | 50 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 13/32" | 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" | 9/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 1/2" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 23/32" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 5/8" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 13/16" | 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" | 9/32" | 100 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 1/4" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 21/64" | 50 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 19/64" | 50 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 13/32" | 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" | 9/16" | 25 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 1/2" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 23/32" | 10 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 5/8" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 13/16" | 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 |
Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8
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 Class 8.8 bolts, they're 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 | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | |||||||
| M3 | 0.5 | 5.5 | 3.7 | DIN 980V | 50 | 000000000 | 00000 |
| M4 | 0.7 | 7 | 4.2 | DIN 980V | 100 | 000000000 | 00000 |
| M5 | 0.8 | 8 | 5.1 | DIN 980V | 100 | 000000000 | 0000 |
| M6 | 1 | 10 | 6 | DIN 980V | 100 | 000000000 | 0000 |
| M8 | 1.25 | 13 | 8 | DIN 980V | 50 | 000000000 | 0000 |
| M10 | 1.5 | 17 | 10 | DIN 980V | 25 | 000000000 | 0000 |
| M12 | 1.75 | 19 | 12 | DIN 980V | 25 | 000000000 | 0000 |
| M14 | 2 | 22 | 14 | DIN 980V | 10 | 000000000 | 0000 |
| M16 | 2 | 24 | 16 | DIN 980V | 10 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 18 | DIN 980V | 5 | 000000000 | 00000 |
| M20 | 2.5 | 30 | 20 | DIN 980V | 5 | 000000000 | 0000 |
| M24 | 3 | 36 | 24 | DIN 980V | 1 | 000000000 | 0000 |
Extreme-Strength Steel Top-Lock
Distorted-Thread Locknuts
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. About 20% stronger than high-strength steel locknuts, they're often used in heavy machinery, such as earth-moving equipment. A cadmium plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
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. A cadmium plating provides corrosion resistance in wet environments and adds 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. | |
Cadmium-Plated Steel—Grade C | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 100 | 000000000 | 00000 |
| 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 | 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" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
Low-Strength Steel Top-Lock Distorted-Thread Locknuts
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. About half the strength of medium-strength steel locknuts, use them in light duty fastening applications, such as securing access panels. 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. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 2 | |||||
|---|---|---|---|---|---|
| 6-32 | 5/16" | 7/64" | 100 | 000000000 | 00000 |
| 8-32 | 11/32" | 1/8" | 100 | 000000000 | 0000 |
| 10-24 | 3/8" | 1/8" | 100 | 000000000 | 0000 |
| 10-32 | 3/8" | 1/8" | 100 | 000000000 | 0000 |
| 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 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 50 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 50 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 25 | 000000000 | 0000 |
18-8 Stainless Steel Top-Lock Distorted-Thread Locknuts
These locknuts have good chemical resistance and may be mildly magnetic. They have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. These locknuts 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.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 6-32 | 5/16" | 7/64" | 50 | 000000000 | 00000 |
| 8-32 | 11/32" | 1/8" | 50 | 000000000 | 0000 |
| 10-24 | 3/8" | 1/8" | 50 | 000000000 | 0000 |
| 10-32 | 3/8" | 1/8" | 50 | 000000000 | 0000 |
| 1/4"-20 | 7/16" | 7/32" | 50 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 7/32" | 25 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 25 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 25 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | 10 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 5 | 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 |
| 1"-8 | 1 1/2" | 55/64" | 1 | 000000000 | 0000 |
Super-Corrosion-Resistant 316 Stainless
Steel Top-Lock Distorted-Thread Locknuts
These locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. These locknuts 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. Nuts may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.