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: For external threads, the diameter of the relief must be smaller than the minor diameter of the thread. Radius ( ) : Standardized at approximately for Form A to reduce stress concentrations. Usage Comparison: Form A vs. Other Forms Thread Type Type/Length Primary Use A Normal (Long) Standard external threads for flush mounting. B External threads where space is restricted. C Normal (Long) Standard internal (blind hole) threads. D Internal threads for special technical reasons. Important Considerations

Din 76a Pdf Jun 2026