Core Functions
Provides a removable flange connection for piping systems
Facilitates easy installation, inspection, and maintenance
Allows alignment of bolt holes independently of pipe orientation
Key Features
Material: Carbon steel (e.g., A105, A350 LF2) — strong and cost-effective for many industrial applications
Two-Piece Design:
Stub End: Welded to the pipe
Lap Joint Flange: Slides over the stub end and bolts to the mating flange
Alignment Flexibility: Flange can rotate freely around the stub end to align bolt holes easily
Standards Compliance: Manufactured to ASTM/ASME, DIN, EN, and other relevant standards
Pressure Ratings: Available in standard ANSI/ASME pressure classes (e.g., 150 #, 300 #, 600 #, etc.)
Surface: Prepared flange face for gasket seating and tight sealing
Carbon Steel Lap Joint Flanges
Carbon Steel Lap Joint Flanges are pipe fittings used in conjunction with a stub end to form a flange connection. They are ideal where frequent dismantling, alignment flexibility, or ease of maintenance is needed. Unlike weld-neck or slip-on flanges, the lap joint flange does not weld directly to the pipe — instead, the pipe is welded to the stub end, and the flange itself “laps” over it.

