牙規. PG. 螺距. Pitch. P mm. 螺紋外徑. Outside. Diameter. D1 φmm. 螺紋小徑. Minor. Diameter ... PF 1/4. 1.337. 13.157. 11.445. 11.8. 13.2 ~ 13.4. PF 3/8.
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