Steel pipe nipple, barrel nipple, close nipple, hose nipple, USA STANDARD: ANSI/ASTM A733 PIPE: ASTM A53 THREADS: ANSI B1.20.1 BRITISH STANDARD: BS1387 BS EN10241 PIPE: BS 1387 THREAD: ISO7/1 DIN STANDARD: DIN 2982 PIPE: DIN 2440 THREADS: DIN 2999 Surface: Galvanized, hot-dipped Galvanized and black. Packing: carbon then put on pallet.