Carbon Steel Slip-On Flange

Carbon steel slip-on flanges to ASME B16.5 / EN 1092-1 that slide over the pipe end and are secured with two fillet welds — one outside, one at the bore. Lower cost and easier fit-up than weld-neck, with no need for precise pipe cut length.

Slip-ons are the workhorse for utility piping, water and air systems, and equipment connections at moderate pressures. Fit-up tolerance makes them popular for field assembly and retrofits. For high-pressure, cyclic, or fatigue-critical lines, specify weld-neck instead. Select PN/class and size from the table above.

Quoted and sold per piece. Send the size, PN/class, quantity, and destination in a quote request for pricing, stock status, and freight.

These slip-on flanges are ASME B16.5 Class 150 (PN20), from ¾" (DN20) to 6" (DN150). They do not mate with EN 1092-1 PN16 flanges: a 2" Class 150 flange has a 120.7 mm bolt circle and 4 × ⅝" bolts, while DN50 PN16 has 125 mm and 4 × M16. A 4" flange has a 229 mm outside diameter, a 190.5 mm bolt circle and 8 × ⅝" bolts, and its bore suits 114.3 mm pipe.