How to Insert a Spring Pin

by C.L. Rease

Spring pins use tension created by compression to lock tight in a hole drilled through two or more components. Before installation, the diameter of a spring pin measures slightly larger than a drilled hole. The diameter of the spring pin shrinks as it enters a drilled hole. This provides the tension necessary to keep a spring pin secure in a material. Numerous designs of spring pins are available but no matter the design, they all use the same methods of installation. Incorrectly installing a spring pin will cause its body to deform and lodge in a part before the pin seats in the material.

Step 1

Spread lightweight oil over the exterior surface of the spring pin.

Step 2

Grasp the spring pin with the jaws of a pair of needle-nose pliers. Ensure that at least 1/8 inch of the pin sits past the top edge of the pliers.

Step 3

Align the spring pin with the appropriately sized drilled hole. Tap the end of the pin extending beyond the jaws of the pliers with a ball-peen hammer. Release your grip with the needle-nose pliers when the spring pin sits tightly in the hole.

Set the tapered end of the spring pin set on the end of the spring pin. Hit the flat end of the spring pin set with the ball-peen hammer to drive the spring pin flush with the top surface of the drilled material.

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