1-8 x 1 1/4 gives maintenance teams a classic square-head set screw with a full UNC callout and a wrench-driven head for heavy mechanical layouts.
Typical applications include pulleys and sheaves on line shafts where the head is intentionally exposed. Half Dog, Full Dog, Cone, Oval, and Flat points are the ordering paths for this square-head series. Half Dog points register into shallow holes or slots when location matters under load.
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: 1-8 (UNC)
- Thread Fit: 2A (per ASME B18.6.2)
- Length: 1 1/4 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.
