When the required length is not represented by a standard SKU row, 1 3/8-6 gives purchasing a diameter-level path into the square-head category.

Typical applications include large adjustment stops, travel-limit hardware, and machine fixtures. 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.

Cold Headers can review less-common square-head sizes, long lengths, and point combinations when the standard catalog matrix does not cover the need. 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: 1 3/8-6 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Width Across Flats (F): 1.375 / 1.342 in. (max/min)
• Across Corners (G): 1.945 / 1.843 in. (max/min)
• Head Height (H): 1.063 / 1.000 in. (max/min)
• Dimensional Standard: ASME B18.6.2

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