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Lap Joint Flanges Manufacturer

Lap Joint Flanges


Size 1/2Inche (15 NB) To 48Inche (1200NB)
Standard ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Pressure Ratings Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.
Carbon Steel Lap Joint Flange/ LJ Forged Flanges ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F7
Stainless Steel Lap Joint Flange/ LJ Forged Flanges ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L
Alloy Steel Lap Joint Flange/ LJ Forged Flanges ASTM A182 F1, F5, F9, F11, F22, F91
Special Alloy Lap Joint Flange/ LJ Forged Flanges Duplex, Super Duplex, Nickel Alloys
Flange Face Type Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Coating/Surface Treatment Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Value Added Services CNC Machining, Customised Flanges

Details :

  • Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”.
  • These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
  • Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
  • They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).

Lap Joint flanges have certain special advantages :

  • Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
  • Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
  • In systems which erode or corrode quickly, the flanges may be salvaged for re-use.

Carbon Steel/ Stainless Steel Lap Joint Flange Pressure :

  • ANSI/ASME B16.5 Lap Joint Flange 150lb
  • ANSI/ASME B16.5 Lap Joint Flange 300lb
  • ANSI-ASME B16.5 Lap Joint Flange 400lb
  • ANSI/ASME B16.5 Lap Joint Flange 600lb
  • ANSI/ASME B16.5 Lap Joint Flange 900lb
  • ANSI/ASME B16.5 Lap Joint Flange 1500lb
  • ANSI/ASME B16.5 Lap Joint Flange 2500lb

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