For drawings that call out a wrench-driven set screw, 5/16-18 x 1/2 identifies the coarse thread, length, material class, and square head geometry.

Typical applications include agricultural equipment with exposed mechanisms and field-adjusted stops. This row uses the square-head point menu, but the 5/16-18 x 1/2 note calls out a Full Dog availability limitation; confirm the point style at order. Half Dog points register into shallow holes or slots when location matters under load.

Cold Headers keeps this legacy set screw family practical for maintenance, repair, and production users who still need the square-head form. Review the selected point, wrench clearance, and mating feature before substitution. Cup point slotted set screws are the related screwdriver-driven option when flush-fitting access is preferred.

Technical Highlights

• Head: Square, wrench-driven
• Material: Low Carbon Steel, Case Hardened
• Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order; see row note for Full Dog availability)
• Thread Size: 5/16-18 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 1/2 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)
• Head Radius (W): 0.78 in. (min)
• Neck Relief: (K) 0.240 / 0.225 in. dia. (max/min), (U) 0.111 in. min width, (S) 0.036 in. min fillet
• Dimensional Standard: ASME B18.6.2

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