A307 •長度單位 Unit of Length (mm) CUTTING 絲攻特點 FEATURES OF TAPS 切削絲攻(底孔徑=內徑) Cutting Taps (Drill Hole Dia.=Internal Dia.) 擠壓絲攻(底孔徑>內徑) Forming Taps (Drill Hole Dia.>Internal Dia.) 被加工材 Workpiece 被加工材 Workpiece 內徑 Internal Dia. 底孔徑 Drill Hole Dia. 底孔徑大於建議值， 擠壓量不足 Drill Hole Dia.>Suggested Values Insufficient Forming 螺紋牙行正確 The Correct Form of Thread 底孔徑小於建議值， 擠壓量過多，牙山過飽 Drill Hole Dia.<Suggested Values Over forming 被加工材 Workpiece 被加工材 Workpiece 內徑 Internal Dia. 底孔徑 Drill Hole Dia. NG NG OK 螺旋絲攻 Spiral Flute Taps 先端絲攻 Spiral Point Taps 手絞絲攻 Hand Taps
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