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About Socket Head Screws
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Alloy Steel Socket Head Screws
Fully Threaded
Partially Threaded
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.
Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
1 1/8"-12 | |||||||||||
Black-Oxide Alloy Steel | |||||||||||
| 3" | Fully Threaded | __ | Fine | 1 11/16" | 1 1/8" | 7/8" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |
| 4" | Partially Threaded | 2 7/8" | Fine | 1 11/16" | 1 1/8" | 7/8" | 170,000 | ASTM A574 | 1 | 000000000 | 00000 |
| 5" | Partially Threaded | 2 7/8" | Fine | 1 11/16" | 1 1/8" | 7/8" | 170,000 | ASTM A574 | 1 | 000000000 | 00000 |