For replacement work on older equipment, 3/8-16 x 5 1/2 keeps the UNC pitch patch, length, and square-head drive clear in the product record.

Typical applications include farm implements, mill equipment, and production machinery that need wrench clearance. The five-point structure lets the same square-head size serve locating, bearing, and seating requirements. Flat points bear against a machined flat without intentional penetration into the mating surface.

Cold Headers supports square-head set screw sourcing with a catalog organized around exact size, standard, and point selection. The family runs UNC coarse thread throughout, the traditional square-head series. For cup point square heads, use the separate Cup Point Square Head Set Screws category rather than this five-point family.

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: 3/8-16 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 5 1/2 in.
• Width Across Flats (F): 0.375 / 0.362 in. (max/min)
• Across Corners (G): 0.530 / 0.497 in. (max/min)
• Head Height (H): 0.293 / 0.270 in. (max/min)
• Dimensional Standard: ASME B18.6.2

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