1/4-20 x 3 is a square head machine set screw for assemblies that need point-style selection and direct wrench access.

Typical applications include retrofit work where the mating hole, flat, or seat determines the point style. The row represents a square-head size, while the point selection is made from Half Dog, Full Dog, Cone, Oval, and Flat. External wrench access is useful when an internal socket recess would be hard to keep clear.

Cold Headers supports square-head set screw sourcing with a catalog organized around exact size, standard, and point selection. Review the selected point, wrench clearance, and mating feature before substitution. 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: 1/4-20 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 3 in.
• Width Across Flats (F): 0.250 / 0.241 in. (max/min)
• Across Corners (G): 0.354 / 0.331 in. (max/min)
• Head Height (H): 0.196 / 0.178 in. (max/min)
• Dimensional Standard: ASME B18.6.2

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