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


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.

HSS step drill bits wt spiral flutesS

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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  / /

    types of hss step drill bits

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