Any questions about GB/T 5782-2000?
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GB/T 5782-2000: Examples of marking for hex head bolts. For a bolt with a thread size of d = M12, nominal length l = 80, and performance grade of 8.8, a hex head bolt with surface treatment of galvanizing and passivation of grade A is marked as: Bolt GB/T5782-2000 M12×80 8.8—ZnD. Question: The marking does not specify the thread length, whereas the standard provides three reference values for the thread length (b). What is the standard used in production? Thread specifications: dM12M16M20M24M30M36M42M58M56M64; P1): 1.75, 2.5, 3.5, 4.5, 5.5, 6.5; b – reference; 2): 30, 38, 46, 54, 66-----; 3): 36, 44, 52, 60, 72, 84, 96, 108--; 4): 49, 57, 65, 73, 85, 97, 109, 121, 113, 71, 53
Is this question too stupid? !
Take a close look at the standards; it’s explained very clearly.
Could you give me a copy of this standard? Thank you! !