牙規. PG. 螺距. Pitch. P mm. 螺紋外徑. Outside. Diameter. D1 φmm. 螺紋小徑. Minor. Diameter ... PF 1. 2.309. 33.249. 30.291. 30.8. 33.3 ~ 33.6. PF 1 1/4.
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