1/2 x 3 1/2 Tension Pin (Slotted Spring Pin) is built around the slotted spring-pin principle: free diameter larger than the recommended hole. The slotted construction is the reason this same fastener is commonly indexed as a spring pin or roll pin. The slot accommodates the difference between the 0.513-0.524 in. free OD and the smaller 0.500-0.510 in. hole.

This size is often reviewed for small gear hubs, pulley spacers, and drive accessories when a self-retaining driven pin is specified. For worn precision holes, 0.001 Oversize Dowel Pins may be the better repair path than using a spring 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: 1/2 in.
• Length: 3 1/2 in. +/-0.030 in.
• Pin OD Before Insertion: 0.524 / 0.513 in. (max/min)
• Recommended Hole Size: 0.510 / 0.500 in. (max/min)
• Min Double Shear: 27,100 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.