5/16-18 x 1 1/4 Cup Point Slotted Headless Set Screw uses a straight slot drive so a flat-blade screwdriver can seat the cup point without matching an internal socket size. The straight slot is useful in service kits, older equipment, and awkward access points where a screwdriver reaches more naturally than a key. Standard cup proportions run roughly 0.55 to 0.62 of nominal thread diameter, which is why the exact thread size matters.

This size is relevant for appliance repair, instrument repair, fan hubs, and adjustment points on compact equipment, especially when the slotted drive is already part of the equipment design.

Use Cold Headers for specialty fastener support when maintenance records call for uncommon cup point slotted sizes. Review the tapped-hole depth, screwdriver clearance, and point contact requirements before replacing a different point style.

Technical Highlights

• Drive: Straight Slot (flat-blade screwdriver)
• Point: Cup
• Thread Size: 5/16-18
• Length: 1 1/4 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.