#8 - Installing coiled spring pins

Coiled spring pins were designed for assembly. Compared to other pins, the square ends, concentric chamfers, and lower insertion forces ease installation. Additionally, coiled pins can accommodate wider hole tolerances better than any other pin type because they compress during installation and conform to the shape of the hole. Coiled pins are the easiest type of pin to install and are designed to be serviceable.

The coiled pin’s nominal diameter represents the recommended hole size for the product into which it’s being installed. Coiled spring pin design guidelines provide the recommended hole tolerance range. The coiled pin’s pre-installed diameter is greater than the hole size, and the chamfer diameter is smaller than the hole. During installation, the swaged chamfer aligns the coiled pin with the hole and facilitates compression of the coils as it’s driven into position.

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