Roll Pin

What Are Roll Pins?

Roll pins — also commonly called spring pins or tension pins — are among the most clever and reliable fasteners in a mechanic's or technician's arsenal. A roll pin is a hollow, cylindrical fastener with a single longitudinal slot running the full length of its body. Made from spring steel, the pin is formed into a cylinder that is slightly larger in diameter than the hole it is designed to fit. When driven into place, the slot closes under compression, and the outer surface bears firmly against the hole wall — creating an interference fit that holds the pin securely without threads, adhesive, or additional hardware.

How Roll Pins Work

The operating principle behind a roll pin is elegantly simple. Because the pin is oversized relative to the hole, the spring force of the compressed steel keeps the pin retained once installed. It cannot vibrate out and will not back off under load, making it an outstanding choice for high-vibration environments found in automotive, powertrain, and machinery applications. A standard jobber-drilled hole at nominal diameter is all that is needed — no precision tolerancing required.

Roll pins are commonly available in two distinct types:

• Slotted Roll Pins – The most popular variety, these general-purpose fasteners are manufactured with a gap that allows the pin to flex during installation, absorbing varying tolerances. They are a low-cost, effective solution for a wide range of applications.
• Coiled Spring Pins – These versatile fasteners are wound in coils rather than stamped from a single strip, giving them superior shock and vibration dampening characteristics. They are offered in light, standard, and heavy-duty variants to match specific strength requirements.

Common Applications

Roll pins are used wherever a component needs to be locked to a shaft, a pivot point needs to be created, or a part must be retained in a fixed axial position. Typical uses include serving as dowels, spacers, stop pins, hinge pivots, and locking devices in gear assemblies, steering components, linkages, and drivetrain hardware. Their versatility and reliability make them at home in automotive repair, agricultural equipment, marine machinery, and general industrial assembly work.

What to Consider When Shopping for Roll Pins

Selecting the right roll pin comes down to a few key factors: material, duty rating, diameter, and length. Most roll pins are crafted from carbon steel or stainless steel — stainless options offer better corrosion resistance and are ideal for marine or wet environments. Duty rating (light, standard, or heavy) determines the pin's shear strength and flexibility. When in doubt, assortment kits spanning a range of diameters and lengths are an excellent shop staple, ensuring the right pin is always on hand when a repair calls for it.

Top Brands in Roll Pins

Precision Brand is a well-established name in the roll pin category, with roots going back to 1946. The company offers roll pin assortments made from cold-rolled, hardened, and tempered spring steel, featuring chamfered ends that simplify insertion. Their kits — available in standard, metric, and stainless steel configurations — are a practical choice for any shop toolbox or toolroom.