Slotted spring pins—often called roll pins—are hollow, cylindrical fasteners with a longitudinal slot running down the entire length. They are engineered to be oversized relative to the hole they fit into, relying on self-retaining spring force to lock securely into place.

Key Functions and Engineering Benefits

• Self-Locking Design: The pin compresses upon insertion and exerts continuous outward radial force against the hole wall, preventing loosening caused by heavy vibration or shock.
• Cost-Efficient Production: They eliminate the need for high-precision reamed holes, as they easily accommodate wider hole tolerances than solid dowel pins.
• Simplified Assembly: Standard chamfered ends create a smooth lead-in angle, allowing rapid installation using a basic hammer, punch, or automated pneumatic press.

Common Industrial Applications

• Hinges and Pivots: Providing a low-wear, flexible pivot axis for moving mechanical linkages.
• Gear and Shaft Anchoring: Securing gears, pulleys, or sprockets directly to rotating shafts to transmit light-to-medium torque.
• Cross-Pinning Fasteners: Acting as a reliable safety lock to prevent larger nuts or components from backing off.

Our Slotted Spring Pins are available to purchase directly online.