Where a bill of material calls for a wrench-driven cup point screw, the 7/8-9 x 2 1/4 Cup Point Square Head Set Screw keeps the size and geometry explicit. It is a practical choice when top-side wrench access is available and a protruding head is acceptable in the design.

Older production lines and repairable plant equipment often keep these fasteners because the square head is visible and tool-friendly.

Cold Headers keeps the catalog language focused on size, geometry, material, and verified dimensions so buyers can compare parts cleanly. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

• Head: Square, wrench-driven; flats match nominal size
• Point: Cup Point
• Thread Size: 7/8-9 (Class 2A)
• Length: 2 1/4 in.
• Width Across Flats: 0.875 max / 0.852 min in.
• Width Across Corners: 1.237 max / 1.170 min in.
• Head Height: 0.678 max / 0.635 min in.
• Cup Point Diameter: 0.530 max / 0.502 min in.
• Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
• Finish: Plain
• Dimensional Standard: ASME B18.6.2

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