The standard torque equation is T=KFD where T = torque, K is the "nut factor," determined experimentally, F is the force (LBS, N) and D = the nominal bolt diameter.
Does anyone have any data/experience with the value of K for 300 series bolt material, e.g., A193-B8? As received values (dry)...
I have a 1977 version of B16.5. In paragraph 6.3.4.1 it states the following about flange facing finish:
"Either a serrated-concentric or serrated-sprial finsh having from 24 to 40 grooves per inch shall be used. the cutting tool employed shall have an approximate 0.06 in. or larger...
I have read recently that spiral wound gaskets designed in accordance with ANSI B16.20 are suppose to compress to 0.125-0.135 with a uniform bolt stress of 30,000 psi. This means that torque tables should only depend on the bolt size. Yet many tables are set up by pressure class/fitting size...
