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Socket Set Screw — Black, 5/16"-18 Dia x 5/16 in. L, 20-Pack
- Mfg.#
- 4662
- Sku#
- 6387534
- Features steel construction designed for strength in general fastening
- Size listed as 5/16"-18 x 5/16", suitable for USS coarse thread applications
- Features headless, fully threaded slotted design to secure parts within or against others
- Includes Prop 65 warning for possible lead exposure; see www.P65Warnings.ca.gov
* Estimated stock levels as of Mon, Apr 13, 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
This is a Black Socket Set Screw designed to give a low-profile, secure fastening solution when you need hardware that stays out of the way. HILLMAN’s 20-pack of 5/16"-18 x 5/16" screws are made from steel with a plain black finish and USS coarse threads, ideal for clamping collars, retaining gears, or locking pulleys to shafts where a protruding head would be undesirable. At 5/16" diameter and 5/16" length, these socket set screws fit applications that require short, robust fasteners with internal drive access. The consistent sizing and coarse thread form make them useful for general repair, light machinery maintenance, and hobby projects where reliable holding power in a compact form is needed. Keep a set on hand for quick adjustments and dependable mechanical connections.
Specifications
General
| Color | Black |
|---|---|
| Drive Style | Socket |
| Finish | Plain |
| Material | Steel |
| Pack Qty | 20 |
| Thread Type | USS Coarse |
| Thread per Inch | 18 |
| Type | Socket Set Screw |
Dimensions
| Diameter | 5/16" |
|---|---|
| Length | 5/16 in |
| Size | 5/16"-18 x 5/16" |
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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