規範. CNS G3131 JIS G3447, 外徑, 公差, ±10%, -0mm +10mm. ≦25.4mm, ±0.15mm. >25.4 ≦31.8mm, ±0.16mm. >31.8 ≦38.1mm, ±0.19mm. >38.1 ≦76.3mm, ±0.25mm.
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