螺紋螺距(P)鑽孔尺寸(Φ)沉頭(Φ)沉頭深(H)M2M2.5M3M4M5M6M8M10M12M14M16M18M200.40.40.50.70.811.251.51.75222.52.51.72.12.53.34.256.88.510.25121415.517.544.76.589.5111417.520232629322.32.83.44.55.56.69111416182022以上為公制標準螺紋,英制管螺紋1/8約為Φ8.4XΦ9.8英制管螺紋1/4約為Φ11.5XΦ13; 3/8約為Φ14.2XΦ16.5
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