Slip-On Flange 
This flange is slipped over the pipe and then fillet welded. Slip-on flanges are easy to use in fabricated applications.
Standards: ANSI B16.5: 150LB, 300LB, 600LB
DIN: 2573 PN6, 2576 PN10, 2642 PN16
UNI: 2276 PN6, 2277 PN10, 2278 PN16, 6089 PN10, 6090 PN16
Materials: Carbon steel, stainless steel and alloy steel.