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Socket Cap Screw — Black Oxide, 5/16 in. x 1 in., 8-Pack
- Mfg.#
- 535-G
- Sku#
- 6697957
- Designed for indoor fastening applications; size 5/16-18 x 1
- Features black oxide finish on steel alloy for mild corrosion resistance
- Suitable for coarse USS threads (5/16-18) for general fastening
- Features internal hex drive for use with Allen keys or hex drivers
* Estimated stock levels as of Sun, Apr 19, 2026. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availability of items marked as Limited Stock.
Description
The HILLMAN Black Socket Cap Screw is a 5/16"-18 x 1" steel-alloy fastener with an internal hex drive and a black oxide finish, chosen when a low-profile, recessed head and dark appearance are preferred for indoor projects. With USS coarse threads and a 5/16-inch diameter, this 8-pack gives you multiple socket cap screws ready for furniture repair, mounting brackets, assembling metal frames, or replacing worn hardware in fixtures where a neat, machined look matters. The internal hex drive lets you tighten fasteners flush without exposed heads, useful in tight spaces or where a clean aesthetic is important. These screws are practical for hobbyist and trade use alike whenever reliable, compact fastening is needed in indoor applications where matching a darker finish is desirable.
Specifications
General
| Base Material | Steel Alloy |
|---|---|
| Color | Black |
| Drive Type | Internal Hex |
| Finish | Black Oxide |
| Head Style | Socket |
| Indoor/Outdoor | Indoor |
| Pack Qty | 8 |
| Point Type | Blunt |
| Thread Type | USS Coarse |
| Thread per Inch | 18 |
| Type | Socket Cap Screw |
Dimensions
| Diameter | 5/16 in |
|---|---|
| Length | 1 in |
| Size | 5/16"-18 x 1" |
Manufacturing Details
The following information is subject to change without notice
| Prop 65 Warning |
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov
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