AMTECH offers COUPLINGS (FULL AND HALF) FROM BAR STOCK with End type : Socket Weld, Threaded (NPT / BSP) and Material : MS, ASTM A105, SS 304/316 ,with Pressure : 2000, 3000, and 6000 Lbs ,our Size : ½ Inch to 4 Inch. Operation : Precision Dimension Control and superior gauge control by threading with CNC Lathes