1. AMERICAN STANDARD : ASTM A733
PIPE: ASTM A733 / ASTM A53/ ASTM
THREADS: ANST B1.20.1
2. BRITISH STANDARD : BS EN10241
PIPE: BS1387
THREADS: IIS07/1
3. DIN STANDARD : DIN2982
PIPE: DIN2440
THREADS: DIN2999
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