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Home > Frequently Asked Questions What is Pin Diameter? Spring pins - both slotted and coiled styles - are usually called out by size. “1/4" by 1"” would indicate a 1/4" diameter by 1" long part. The diameter is expressed as a nominal measurement. The salient feature of spring pins is that they are manufactured to a controlled, oversized diameter. Therefore, a 1/4" diameter slotted pin has a “Before Insertion” or “Pre-Load” diameter range of .258" minimum to .262" maximum. This allows for the compression of the pin diameter as it is placed into a hole of the recommended size. The result is continuous spring pressure against the side of the hole and self-locking action that prevents loosening. The ASME specification governs the min/max range and the methodology for measuring it.
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