Carbon Steel Flanges
Standard:

ASTM A694 / A 694M F42, F52, F60, F65, F70
ASTM/ ASME S/A105/ A 105M
ASTM/ ASME S/A266/ A 266M GR.1, GR.2, GR.3, GR.4
ASTM/ ASME S/A350/ A 350M LF1, LF2 

Alloy Steel Flanges
Standard:

ASTM/ ASME S/A182/ A 182M F5, F 5a , F9, F11, F12, F22, F91…
ASTM/ ASME S/A336/ A 336M F5, F9, F11, F12, F22, F91…

Range:15 NB to 1500 NB in 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS available with NACE MR 01-75