When a threaded component must be seated with external wrench access, 5/16-18 x 7/8 provides the traditional square head set screw format.

Typical applications include construction machinery where large wrench flats are easier to clean and grip. The row represents a square-head size, while the point selection is made from Half Dog, Full Dog, Cone, Oval, and Flat. Flat points bear against a machined flat without intentional penetration into the mating surface.

Since 1962, Cold Headers has helped industrial buyers identify specialty set screws by thread, length, head style, and point requirement. The family runs UNC coarse thread throughout, the traditional square-head series. Full Dog points register into mating holes or slots when the design calls for deeper engagement.

Technical Highlights

• Head: Square, wrench-driven
• Material: Low Carbon Steel, Case Hardened
• Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
• Thread Size: 5/16-18 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 7/8 in.
• Width Across Flats (F): 0.312 / 0.302 in. (max/min)
• Across Corners (G): 0.442 / 0.415 in. (max/min)
• Head Height (H): 0.245 / 0.224 in. (max/min)
• Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.