Lap Joint Flanges, also known as Loose Joints are used with an interrelated stub – end that inserts in the inside of the flange. The main benefit of this type of flange is that once the pipe welds to insert to the tube end, the flange then can rotate for easier alignment of bolting roles.


Standards: ANSI B16.5,ANSI B 16.47 SERIES a&b,MSS SP44,ASA,API-605,AWWA

Pressure ratings:

class150,class300,class400,class600,class900,class1500,class2500|PN6,PN10,PN25,PN40,PN64 ect.

Carbon Steel Lap Joint Flanges: 

ASTM SA/A105(N),C22.8,ST37.2,A516 GR60/70,ASTM SA350 LF2,ASTM SA694 F42/46/52/56/60/65…

Stainless Steel Lap Joint Flanges:

 ASTM A182 F304/304L/316/316L…
Duplex Stainless Steel: ASTM A182 F51/F53/F55/F60…
Alloy Steel Lap Joint Flanges:

ASTM A182 F1/F5/F9/F11/F22/F91…

Surface Treatment:
Yellow/Black Coating, Anti-Rust Oil