3/8 x 9/16 Tension Pin (Slotted Spring Pin) is intended for driven installation where the slot closes as the pin enters the hole. Tension pin, slotted spring pin, and roll pin describe the same slotted self-retaining pin style. As the pin enters the hole, the slotted wall compresses and the spring steel reacts outward against the hole surface.

Common uses include simple joints replacing taper pins, retaining stops, and service fixtures, where the pin retains parts without a threaded fastener. If the joint must locate parts precisely rather than retain them economically, a dowel pin is usually the product family to check.

Cold Headers has supplied specialty fasteners since 1962 and helps buyers confirm exact pin sizes for maintenance or production requirements. 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: 3/8 in.
• Length: 9/16 in. +/-0.015 in.
• Pin OD Before Insertion: 0.395 / 0.385 in. (max/min)
• Recommended Hole Size: 0.382 / 0.375 in. (max/min)
• Min Double Shear: 16,300 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.