Gauge dimensions for Acme threads are as per ASME B1.5 and Stub Acme as per ANSI/ASME B1.8 Most commonly used class is 2G. If less backlash is desired in acme threads, 3G & 4G class are used The height of Acme threads is 0.5p, whereas the height of Stub Acme threads is 0.3p
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