PIPE FITTING & FLANGE SPECIFICATIONS
FITTING STANDARDS & SPECIFICATIONS
Class or Material
Dimensions
Material Spec.
Galvanizing
Thread
Pressure Rating Federal/Other
Malleable Iron Fittings Class 150/PN 20
ASME B16.3• ASME B16.3•
ASTM A-197 ASTM A-197
ASTM A-153 ASTM A-153
ASME B120.1+ ASME B120.1+
ASME B16.3• ASME B16.3•
ASME B16.3**
Class 300/PN 50
Malleable Iron Unions Class 150/PN 20
ASME B16.39• ASME B16.39• ASME B16.39•
ASTM A-197 ASTM A-197 ASTM A-197
ASTM A-153 ASTM A-153 ASTM A-153
ASME B120.1+ ASME B120.1+ ASME B120.1+
ASME B16.39• ASME B16.39• ASME B16.39•
ASME B16.39***
Class 250
Class 300/PN 50
Cast Iron Threaded Fittings Class 125
ASME B16.4• ASME B16.4•
ASTM A-126 (A) ASTM A-126 (A)
ASTM A-153 ASTM A-153
ASME B120.1+ ASME B120.1+
ASME B16.4• ASME B16.4•
ASME B16.4 ASME B16.4
Class 250
Cast Iron Plugs & Bushings
ASME B16.14•
ASTM A-126 (A)
ASTM A-153
ASME B120.1+
ASME B16.14•
WW-P-471
Cast Iron Drainage Threaded Fittings ASME B16.12• Cast Iron Flanges & Flanged Fittings Class 125 (1”-12”) ASME B16.1•
ASTM A-126 (A)
ASTM A-153
ASME B120.1+
ASME B16.12•
ASTM A-126 (A) or (B)
ASTM A-153 ASTM A-153 ASTM A-153 ASTM A-153
ASME B120.1+ ASME B120.1+ ASME B120.1+ ASME B120.1+
ASME B16.1• ASME B16.1• ASME B16.1• ASME B16.1•
ASME B16.1• ASME B16.1• ASME B16.1• ASME B16.1•
Class 125 (14” & up) Class 250 (1”-12”) Class 250 (14” & up)
ASME B16.1• ASME B16.1• ASME B16.1•
ASTM A-126 (B)
ASTM A-126 (A) or (B)
ASTM A-126 (B)
Forged Steel Threaded Fittings Class 2000, 3000, ASME B16.11•
ASTM A105,
ASME B120.1+
ASME B16.11•
6000
ASTM A182, ASTM A350
Pipe Nipples Steel Pipe - welded
ASTM A53 Type F
ASME B120.1+
WWN 351
ASTM A733
or Type E
Steel Pipe - seamless (High Temperature) Brass
ASTM A733
ASTM A106 Gr.B
ASME B120.1+
WWN 351
ASTM B43
ASME B120.1+
WWN 351
• an American National standard (ANSI) + ASME B120.1 was ANSI B2.1
Formerly WW-P-501 ** Formerly WW-P-521 *** Formerly WW-U-531
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www.watsonmcdaniel.com •• Pottstown PA • USA • Tel: 610-495-5131
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