1/4-20 x 7/8 Cup Point Square Head Set Screw is a square-drive, cup-point set screw for assemblies where the head itself provides the wrenching surface. The square flats also make the part recognizable on older assemblies that were designed before headless hex-socket set screws became common.

Mill and grinder adjustments use this style where rugged wrench access is part of the original machine design.

This family includes uncommon square-head lengths, making the exact size useful for replacement searches and legacy drawings. 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: 1/4-20 (Class 2A)
• Length: 7/8 in.
• Width Across Flats: 0.250 max / 0.241 min in.
• Width Across Corners: 0.354 max / 0.331 min in.
• Head Height: 0.196 max / 0.178 min in.
• Cup Point Diameter: 0.132 max / 0.118 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.