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Bolt - Stress Area

Stress area in UN and UNR bolts

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The weakest points in a bolt is the stressed area in the thread root. The stressed area depends on the type of threads - coarse threads reduces the stressed area compared to fine threads.

Bolt - stressed area

The stressed area in a bolt can be calculated as

A = π / 4  (dn - 0.9743/ n)2                                      (1)

where

A = stressed area (square inch)

dn = nominal bolt diameter (inch)

n = 1 / p = number of threads per inch

p = pitch (length per thread)

Despite that a reduced area will reduce the breaking load of a bolt - coarse threads are used for clamping. Fine threads bolts are weaker due to reduced thread height.

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  • en: stress bolts threads un unr area
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