牙規. PG. 螺距. Pitch. P mm. 螺紋外徑. Outside ... PG 牙DIN 40430. G 牙( PF ) JIS B 0202. NPT 牙ANSI B2.1. 牙規. 公制. ( Metric ). 螺距. Pitch ... M8. 1.25.
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