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Specifications ASTM B462 & ASME SB462 Standard ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799 Size 1/8â?? NB to 4â?? NB (Socketweld & Screwed-Threaded) Class 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS Type Socketweld Fittings, Screwed-Threaded Fittings