Slotted roll pins—also known as slotted spring pins, tension pins, or Selloc pins—are among the most reliable, cost-effective, and versatile mechanical fasteners used across the engineering, automotive, and manufacturing industries.

Despite their simple appearance, these hollow, cylindrical press-fit fasteners play a critical role in securing machine components. They are manufactured slightly oversized relative to the hole they fit into. When driven into a standard drilled hole, the longitudinal slot allows the pin to compress via elastic action. This spring action exerts a continuous outward radial force against the hole walls, creating a self-locking, vibration-resistant friction fit.

Benefits of Slotted Roll Pins

• Eliminates Precise Reaming: Unlike solid dowel pins that require highly precise, expensive reamed holes, slotted pins accommodate wider hole tolerances and work efficiently in standard, plain drilled holes.
• High Shear Strength: Because they operate primarily in double shear applications, they offer exceptional resistance to heavy lateral loads.
• Vibration and Shock Resistance: The continuous radial tension means they will not back out or work themselves loose under high-vibration conditions.
• Nestable for Extra Strength: If an application requires heavy-duty performance, a smaller roll pin can be driven inside a larger one, nearly doubling its shear strength.
• Reusability: They can be hammered out using a proper punch and reused multiple times without losing significant retention force.

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