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American standard:
Materials: ANSI/ASME A197-79
Dimensions: ANSI/ASME B16.3-85
Threads: ANSI/ASME B1.20.1
DIN Standard:
Materials:DIN1692
Dimensions:EN 10242 DIN2950
Threads:ISO 7/1 DIN2999
British Standard:
Materials: ISO 5922 BS 143 and BS1256
Dimensions: ISO 49，Threads: ISO 7/1
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