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Flange Material Grade Standard & Symbol
Carbon Steel Flange ASTM A105/A105N
Carbon Steel
Alloy High Temperature
A182 Gr F1
A182 Gr F11
A182 Gr F12
A182 Gr F22
A182 Gr F5
A182 Gr F9
Carbon Steel
Alloy Low Temperature
A350 Gr LF2
A350 Gr LF3
Stainless Steel Flange A182 Gr F304
A182 Gr F316
A182 Gr F321
A182 Gr F347
Duplex & Super Duplex
Stainless Steel Flange
ASTM A182 F51 / UNS S31803
ASTM A182 F53 / UNS S32750
ASTM A182 F55 / UNS S32760
ASTM A182 F60 / UNS S32205
ASTM A182 F61 / UNS S32550

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Size Inch (mm) Class/Rating Sch / Wall Thickness
From 1/2″ (DN 15) to
24″ (DN 600)
150#, 300#, 600#,
900#, 1500#, 2500#
SCH5S, SCH10S, SCH40S, SCH80S,
SCH5, SCH10, SCH20, SCH30,
SCHSTD SCH40,SCH60,SCHXS, SCH80,
SCH120,SCH140,SCH160, SCHXXS

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Most Common Flange Type Face Selection
Weld Neck Flange, WN
Slip On Flange, SO
Socket Weld Flange, SW
Lap Joint Flange, LP
Threaded Flange, Thrd
Blind Flange, BL
Raised Face, RF
Flat Face, FF
Ring Joint, RTJ