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About Nuts, Materials, and Finishes
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High-Strength Steel Center-Lock
Distorted-Thread Locknuts—Grade 8
These locknuts have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. They're about three times stronger than low-strength steel locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable.
Black-oxide steel locknuts have a dark surface color and are mildly corrosion resistant in dry environments.
Zinc yellow-chromate plated steel locknuts resist corrosion in wet environments.
Zinc-aluminum coated steel locknuts are more corrosion resistant in wet environments than zinc yellow-chromate plated steel locknuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Grade 8 | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 10 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 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 Yellow-Chromate Plated Steel—Grade 8 | |||||
| 1/4"-20 | 7/16" | 7/32" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 50 | 000000000 | 00000 |
| 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 | 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 | 0000 |
| 7/8"-9 | 1 5/16" | 3/4" | 5 | 000000000 | 00000 |
| 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 8 | |||||
| 1/4"-20 | 7/16" | 7/32" | 10 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 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 | 00000 |
Left-Hand Threaded High-Strength Steel
Center-Lock Distorted-Thread Locknuts—Grade 8
These locknuts tighten when turned to the left. They have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. They're about three times stronger than low-strength steel locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Low-Strength Steel Center-Lock
Distorted-Thread Locknuts
An irregularly shaped thread in the middle of the nut grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. 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 | |||||
|---|---|---|---|---|---|
| 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 |
| 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 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
Super-Corrosion-Resistant 316 Stainless
Steel Center-Lock Distorted-Thread Locknuts
These locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. 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.
18-8 Stainless Steel Center-Lock
Distorted-Thread Locknuts
These locknuts have good chemical resistance and may be mildly magnetic. They have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. 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 | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 50 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 50 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 25 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | 25 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 10 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | 10 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 10 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 5 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 41/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 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 |