Step Drill Bit

According to the need to process different diameters of holes, and can achieve large holes in one-time processing, without the need to replace the drill bit and playing positioning holes and so on. On the forming workpiece of step parts, multiple step holes are processed by one-time forming drilling, composite forming, fast and time-saving. High efficiency, saving non-processing man-hours. Use special equipment to grind and process, high precision. Adopting high quality alloy bar, good wear resistance.

Specifications of Step Drill Bit

Solid Carbide Straight Flute Drill for Au. Cast iron

Engineering Data

four-sided grinding
straight flute
for machining of short chipping materials
for machining of thread core holes
cutting till countersinking step

Solid Carbide Straight Flute Drill for Au. Cast iron

d1(h7			L3	L2	L1	d3	d2	d1(h7)			L3	L2	L1	d3	d2
mm			mm	mm	mm	mm	(h6)	mm			mm	mm	mm	mm	（h6)
3.3	M4	GS	11.4	20	62	6	6	10.2	M12	GS	30	60	107	14	14
3.65	M4	GF	11.4	20	62	6	6	11.2	M12	GF	30	60	107	14	14
4.2	M6	GS	13.6	28	66	6	6	12	M14	GS	34.5	65	115	16	16
4.65	M5	GF	13.6	28	66	6	6	13.2	M14	GF	34.5	65	115	16	16
5	M6	GS	16.5	34	79	8	8	14	M16	GS	38.5	73	123	18	18
5.55	M6	GF	16.5	34	79	8	8	15.1	M16	GF	38.5	73	123	18	18
6.8	M8	GS	21	47	89	10	10	15.5	M18	GS	43.5	79	131	20	20
7.4	M8	GF	21	47	89	10	10	16.9	M18	GF	43.5	79	131	20	20
8,5	M10	GS	25.5	55	102	12	12	17.5	M20	GS	47.5	89	147	22	20
9.35	M10	GF	25.5	55	102	12	12	18.9	M20	GF	47.5	89	147	22	20

￠d1 (h7) mm			L3 mm	L2 mm	L1 mm	￠d3 mm	￠d2 (h6) mm


3.3	M4	GS	11.4	20	62	6	6
3.65	M4	GF	11.4	20	62	6	6

4.2	M5	GS	13.6	28	66	6	6
4.65	M5	GF	13.6	28	66	6	6

5	M6	GS	16.5	34	79	8	8
5.55	M6	GF	16.5	34	79	8	8

6.8	M8	GS	21	47	89	10	10
7.4	M8	GF	21	47	89	10	10

8.5	M10	GS	25.5	55	102	12	12

￠d1 (h7) mm			L3 mm	L2 mm	L1 mm	￠d3 mm	￠d2 (h6) mm


10.2	M12	GS	30	60	107	14	14
11.2	M12	GF	30	60	107	14	14
12	M14	GS	34.5	65	115	16	16
13.2	M14	GF	34.5	65	115	16	16

14	M16	GS	38.5	73	123	18	18
15.1	M16	GF	38.5	73	123	18	18

15.5	Ml8	GS	43.5	79	131	20	20
16.9	M18	GF	43.5	79	131	20	20

17.5	M20	GS	47.5	89	147	22	20
18.9	M20	GF	47.5	89	147	22	20

Milling Tools

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Step Drill Bit

Specifications of Step Drill Bit

Relate Non-Standard Carbide Drill Bit