Thursday, February 03, 2011

Coarse Thread vs Fine Thread Strength

Thread Strength Comparison - Fine vs Coarse

Aircraft generally use fine thread fasteners due to their stronger strength. Coarse threads are used when threaded into aluminum or cast iron because the finer threads tend to strip more easily in these materials. The chart above is based on MIL-B-6812E Table II and 125,000 psi UTS.

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