TOTAL-CN TOOLS CO., LTD.

　

　

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STEP TWIST DRILL

Manufacturing process: grinding

　
Material: HSS (HSS-Co are available)
Point angle: 118＜or 135º split point Flute type: N, parabolic flute
Finish: black oxide, bright, polished, or Ti-coated 
Standard: DIN338, DIN340,DIN1897, DIN1869
　
NO. d1 d L2 L4 L1
1 3.4 2.5 39 8.8 70
2 4.5 3.3 47 11.4 80
3 5.5 4.2 57 13.6 93
4 6.6 5 63 16.5T 101
5 9 6.8 81 21 125
6 11 8.5 94 25.5 142
7 14 10.2 108 30 160
8 16 12 120 34.5 178
　
　

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