Where socket recesses can fill with debris, 1-8 x 4 1/2 offers an external square head that can be turned without relying on an internal drive.

Typical applications include legacy equipment repairs that need the square-head form called out on older drawings. Half Dog, Full Dog, Cone, Oval, and Flat points are the ordering paths for this square-head series. Point selection should reflect the shaft feature, acceptable marking, and expected service adjustment.

Availability-row diameters and unusually long lengths are handled as quote-driven square-head requirements by Cold Headers. Review the selected point, wrench clearance, and mating feature before substitution. Oval points suit grooves or repeated adjustment where a radiused contact is useful.

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: 1-8 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 4 1/2 in.
• Width Across Flats (F): 1.000 / 0.974 in. (max/min)
• Across Corners (G): 1.414 / 1.337 in. (max/min)
• Head Height (H): 0.774 / 0.726 in. (max/min)
• Dimensional Standard: ASME B18.6.2

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