BOLTS BOLTS kali_0142 (Mechanical) (OP) 6 Feb 18 05:06 HI FRIENDS. MY CUSTOMER SAID TO CHANGE BOLTS B7M TO B7. ACTUALLY THREAD SIZE OF VALVES 5/8" BUT M14 BOLT ENTER THE HOLE. THIS IS ACCEPTABLE. PLEASE JUSTIFY RE: BOLTS MikeHalloran (Mechanical) 6 Feb 18 14:10 "This" is acceptable to whom? What is 'this'? Using a M14 bolt in a 5/8" threaded hole? Who would justify that? Some discussion re B7 vs. B7M: http://www.eng-tips.com/viewthread.cfm?qid=163024 Read that, and get back to us if you have a coherent question. It's okay to use more words. Mike Halloran Pembroke Pines, FL, USA RE: BOLTS LittleInch (Petroleum) 6 Feb 18 15:46 And read this one also http://www.eng-tips.com/viewthread.cfm?qid=434468 Basically NO, you can't use MXX sized bolts on ASME B 16.5 flanges Remember - More details = better answers Also: If you get a response it's polite to respond to it.