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Hex Jam Nuts

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A hex jam nut has six sides and a hollow center with internal threading allowing it to fit over an externally threaded shaft, much like a finished hex nut. The primary variance is that hex jam nuts offer a thinner body than standard hex nuts. This design is to accommodate applications with space limitations where a standard height nut will not fit. Jam nuts are offered in grade A, A563 in common diameter and pitch options. Be sure to select a diameter and pitch to match that of the accompanying bolt.

Jam nuts are often used as a secondary nut to ensure a hex nut is secured in place and will not loosen from vibrations. They are heavily utilized in the automotive industry for machinery and equipment where space is limited and vibrations are common. Fasteners Etc., Inc. offers standard hex jam nuts, heavy hex jam nuts, and metric jam nuts in the below material and finishes to fit your project needs.

A563, Grade A finished jam nuts- plain, zinc, yellow zinc, and hot dipped galvanized
A563, Grade A heavy hex jam nuts- plain and zinc
Metric Class 4 hex jam nut, DIN939B- plain and zinc

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