ASME B31.3 Limitations on Bolting
Requirements for bolting are provided in para. 309. Listed bolting is acceptable. The only relevant component standards are ASME Bl.l, Unified Inch Screw Threads (UNand UNR Thread Form). ASME B 18.2.1, Square and Hex Bolts and Screws (inch series), and ASME B 18.2.2, Square and Hex Nuts (inch series). Table A-2 in ASME B31.3, Appendix A provides listed boiling material specifications. Unlisted bolting (i.e., not listed in Table A-2) are subject to the requirements of para. 30