Flange Bolt and Nut Material Selection
Flange Bolt and Nut Material Selection
(OP)
Can someone advise where I will find recommendations on the correct bolt and nut materials for ASME B16.5 flanges?
Dennis Kirk Engineering
www.ozemail.com.au/~denniskb





RE: Flange Bolt and Nut Material Selection
I guess it could thus depend on the specific application and governing code for that application; however, e.g. I know that AWWA C207, Steel Pipe Flanges for Waterworks Service (that refers to B16.5 for basic compatitibility, of at least drilling and other dimensions etc. of some class designs) says,
"Bolts shall be carbon steel, ASTM A307 grade B for class B & D flanges. Bolts for class E and F flanges shall be ASTM A193 grade B7. Nuts shall be ASTM A194 grade 2H. Bolts shall have regular unfinished square or hexagonal
heads, and nuts shall have regular square or hexagonal dimensions, all in accordance with ANSI B18.2.1 for wrench head bolts and nuts and wrench openings."
I think ASTM A307 and A193 are included in the ANSI B16.5 "Group" of acceptable bolting material standards I remembered per B16.5.
RE: Flange Bolt and Nut Material Selection
RE: Flange Bolt and Nut Material Selection
Then, you may choose the material in the same category (high/medium/low strength) based on the availability and cost. Also, you could simplify your selection to one or two types, so it won't cause any confusion or mistake during construction.