About Nuts, Materials, and Finishes
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About Socket Head Screws
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Alloy Steel Socket Head Screws
With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.
Black-oxide steel screws are mildly corrosion resistant in dry environments. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance. They are not compatible with coarse threads.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
2 1/4"-8 | |||||||||||
Black-Oxide Alloy Steel | |||||||||||
| 6" | Partially Threaded | 5 5/8" | Coarse | 3 3/8" | 2 1/4" | 1 3/4" | 170,000 | ASTM A574 | 1 | 000000000 | 0000000 |
| 8" | Partially Threaded | 5 5/8" | Coarse | 3 3/8" | 2 1/4" | 1 3/4" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |
| 10" | Partially Threaded | 5 5/8" | Coarse | 3 3/8" | 2 1/4" | 1 3/4" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |
Extreme-Strength Steel Extra-Wide Hex Nuts—Grade 2H
Also known as heavy hex nuts, these nuts are about 10% wider and taller than standard hex nuts and distribute the load over a large area. Grade 2H nuts are comparable in strength to Grade 9 bolts. They're about 20% stronger than high-strength steel nuts and are used in heavy machinery, such as earth-moving equipment.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—ASTM Grade 2H | ||||||
|---|---|---|---|---|---|---|
| 2 1/4"-8 | 3 1/2" | 2 13/64" | ASME B18.2.2, ASTM A194 | 1 | 000000000 | 000000 |
High-Strength Steel Nylon-Insert Locknuts—Grade 8
A nylon insert grips the bolt to resist loosening without damaging threads. These nuts are reusable, but their holding power lessens with each use. Made from Grade 8 steel, they're about 25% stronger than medium-strength steel locknuts.
Steel locknuts without a finish are ready to be painted or finished.
Zinc yellow-chromate plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.