1-8 x 2 3/4 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. The product record carries the size; the requested point is selected from the Half Dog, Full Dog, Cone, Oval, and Flat menu. Half Dog points register into shallow holes or slots when location matters under load.

For hard-to-find square-head requirements, Cold Headers can help confirm the size and point style before quote work begins. Review the selected point, wrench clearance, and mating feature before substitution. Cup point slotted set screws are the related screwdriver-driven option when flush-fitting access is preferred.

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: 2 3/4 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)
• Head Radius (W): 2.50 in. (min)
• Neck Relief: (K) 0.838 / 0.823 in. dia. (max/min), (U) 0.250 in. min width, (S) 0.081 in. min fillet
• Dimensional Standard: ASME B18.6.2

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