3/4-10 x 1 1/4 is a case hardened low carbon steel square head set screw for machinery that uses wrench-driven adjustment or retention.

Typical applications include crusher and screen plants that use rugged retaining screws around shafts and collars. The product record carries the size; the requested point is selected from the Half Dog, Full Dog, Cone, Oval, and Flat menu. External wrench access is useful when an internal socket recess would be hard to keep clear.

Cold Headers keeps this legacy set screw family practical for maintenance, repair, and production users who still need the square-head form. 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: 3/4-10 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 1 1/4 in.
• Width Across Flats (F): 0.750 / 0.729 in. (max/min)
• Across Corners (G): 1.060 / 1.001 in. (max/min)
• Head Height (H): 0.582 / 0.544 in. (max/min)
• Head Radius (W): 1.88 in. (min)
• Neck Relief: (K) 0.620 / 0.605 in. dia. (max/min), (U) 0.200 in. min width, (S) 0.065 in. min fillet
• Dimensional Standard: ASME B18.6.2

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