7/8-9 x 3/4 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. Point choice is part of the order detail, with Half Dog, Full Dog, Cone, Oval, and Flat handled under this family. 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: 7/8-9 (UNC)
• Thread Fit: 2A (per ASME B18.6.2)
• Length: 3/4 in.
• Width Across Flats (F): 0.875 / 0.852 in. (max/min)
• Across Corners (G): 1.237 / 1.170 in. (max/min)
• Head Height (H): 0.678 / 0.635 in. (max/min)
• Dimensional Standard: ASME B18.6.2

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