High Quality HSS Step Drill Bit with Spiral Flute

Size: 4-12mm, 4-20mm, 4-32mm

Material: HSS or Cobalt M35, HIGH SPEED STEEL

Flute Type: Spiral Flutes

Surface Finish: Bright

Application: Steel, Brass, Copper, Aluminium, Wood and Plastic Material

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Product Detail

hss step drill sizes

types of hss step drill bits

FEATURES

1. Step drill bits are perfect for drilling and enlarging multiple-holes in thin sections of sheet metals, pipes, plexiglass, plastics, wood up to a thickness of 5mm.
2. 135° Split Point Tip: increases cutting speed with self-centering and the drills do not run off center.
3. A variety of hole diameters can be drilled using only one tool.
4. The dimension of drilled hole is exact.
5. Two Flute Design: provides longer life and better chip removal.
6. The Spiral Groove: creates better, less noise, less force has to be used.

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Metric Size Step Drill Bit
Drilling Range(mm)	Number of Steps	Dia of Steps(mm)	Overall Length(mm)	Shank Dia(mm)
3-12	5	3-6-8-10-12	/	6
3-12	10	3-4-5-6-7-8-9-10-11-12	/	6
3-14	12	3-4-5-6-7-8-9-10-11-12-13-14	/	6
3-14	1	3-14	/	6
4-12	5	4-6-8-10-12	65	6
4-12	9	4-5-6-7-8-9-10-11-12	65	6
4-20	9	4-6-8-10-12-14-16-18-20	75	8
4-22	10	4-6-8-10-12-14-16-18-20-22	80	10
4-30	14	4-6-8-10-12-14-16-18-20-22-2-26-28-30	100	10
4-39	13	4-6-12-15-18-21-24-27-30-33-36-39	107	10
5-13	5	5-7-9-11-13	65	6.35
5-20	1	5-20	/	/
5-25	11	5-7-9-11-13-15-17-19-21-23-25	/	/
5-25	11	5-7-9-11-13-15-17-19-21-23-25	82	9.5
5-35	13	5-13-15-17-19-21-23-25-27-29-31-33-35	82	12.7
6-18	7	6-8-10-12-14-16-18	/	10
6-20	8	6-8-10-12-14-16-18-20	71	9
6-25	7	6-9-12-16-20-22.5-25	65	10
6-30	13	6-8-10-12-14-16-18-20-22-24-26-28-30	100	10
6-32	9	6-9-12-16-20-22.5-25-28.5-32	76	10
6-35	13	6-8-10-13-16-18-20-22-25-28-30-32-35	/	10
6-36	11	6-9-12-15-18-21-24-27-30-33-36	85	10
6-38	12	6-9-13-16-19-21-23-26-29-32-35-38	100	10
6-40	16	6-11-17-23-29-30-31-32-33-34-35-36-37-38- 39-40	105	13
8-20	7	8-10-12-14-16-18-20	/	/