Tension Pins

Tension Pins

Tension pins handle the kind of home improvement and mechanical repair jobs where a threaded fastener simply won’t work. Each pin has a lengthwise slot that lets the cylinder compress on entry, then spring outward to grip the bore wall from the inside. Find multiple diameters and lengths at Tractor Supply to cover everything from light shop repairs to heavy equipment maintenance.

Spring-Action Fasteners for Mechanical Assemblies

Spring pins and tension pins refer to the same fastener – a slotted cylinder that holds a joint together by pushing outward through a drilled hole rather than threading into it or relying on adhesive. Once seated, the compressed pin presses against the bore wall on all sides, and that constant outward force keeps it from backing out under vibration or repeated stress. It’s a locking method that other fasteners don’t replicate, which is why tension pins remain a standard in both light repairs and heavy mechanical assemblies.

Steel constructions give tension pins both the stiffness to carry weight and the flexibility required by the slotted design. Hard materials without any give would crack under compression rather than spring back, so steel’s balance of strength and elasticity is what makes the design functional.

Tough Jobs That Call for Tension Pins

Shaft connections are where most people first reach for a tension pin – securing a gear, sprocket or pulley so it rotates with the shaft rather than spinning freely on it. The same principle applies to clevis pins on tractors and field equipment, where the joint needs to pivot without separating. When other pins, such as cotter pins, can’t match the hole geometry or load requirements, tension pins are often the next option.

Diameters and Lengths for the Task

Getting the diameter right matters more than any other dimension because it determines how much spring force the pin generates in the bore. Our diameters start at 3/32 in. for small, low-load applications and step up to 3/8 in. for joints that take on significant shear force. Lengths run from 3/4 in. to 2-1/2 in., with the longer options providing more contact area along the bore wall in thicker assemblies. A pin that’s undersized for its hole won’t grip firmly enough to hold under load, so checking the bore diameter before selecting a pin is crucial.

Stock Tension Pins from Tractor Supply

The right pin size at the right moment is what separates a finished repair from a stalled one. By keeping a selection of common diameters and lengths on hand, you'll have the right hardware available whenever a shaft connection loosens or a clevis joint requires maintenance. Shop on our website or stop by your local Tractor Supply store to explore our hardware inventory.