1/4 x 3/8 Tension Pin (Slotted Spring Pin) is formed oversize before installation so the slotted body can compress as it is driven. The catalog term is tension pin, while many drawings use slotted spring pin and many shops say roll pin. The pin OD is intentionally larger than the recommended hole before insertion, and the slot gives the diameter somewhere to close during driving.

This size is often reviewed for small gear hubs, pulley spacers, and drive accessories when a self-retaining driven pin is specified. When the design requires repeatable precision location, compare Heat Treated Steel Standard Dowel Pins with a reamed hole and ground pin.

Cold Headers brings long-running industrial fastener experience to tension-pin quoting, cross-checking, and size confirmation. Review the verified OD, hole-size, shear, and length-tolerance data before matching this pin to a drawing or service record.

Technical Highlights

• Nominal Diameter: 1/4 in.
• Length: 3/8 in. +/-0.015 in.
• Pin OD Before Insertion: 0.264 / 0.258 in. (max/min)
• Recommended Hole Size: 0.256 / 0.250 in. (max/min)
• Min Double Shear: 7,050 lbs
• Material: Spring Steel (cold rolled, hardened and tempered)
• Ends: Chamfered both ends
• Style: Slotted (also called spring pin / roll pin)
• Dimensional Standard: ASME B18.8.2

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