5/16-18 x 5/16 Cup Point Slotted Headless Set Screw fits applications where a screwdriver-driven cup point set screw is preferred over socket-key installation. The slot can be driven with common flat-blade tools, avoiding the need to identify and carry a separate key size. The hollow-rim point can bite into the mating surface, so selection should consider whether a witness mark is acceptable.

For collars, hubs, small gears, light shafts, and hardware where the set screw sits below the surface, verify the thread, length, and mating surface before substituting another set screw style. Square Head Set Screws remain a wrench-driven alternative in this catalog section.

Cold Headers supports exact-size sourcing when a drawing or parts list calls for slotted headless set screw hardware. Check the diameter, length, drive access, mating material, and whether cup-point marking is acceptable before ordering.

Technical Highlights

• Drive: Straight Slot (flat-blade screwdriver)
• Point: Cup
• Thread Size: 5/16-18
• Length: 5/16 in.
• Material: Carbon Steel
• Cup Point Diameter: approx. 0.55-0.62 x nominal diameter
• Head: None (headless, installs below surface)
• Dimensional Standard: ASME B18.6.2

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