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Spiral Flute HSS Step Drill Bits With Two Relief
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Product Name: Spiral Flute HSS Step Drill Bits With Two Relief
Product Numbers: STDR-30201
Product Specifications: 4-12 6-40
Product Unit: Spiral Flute
Product Remark: Two relief Angle
Product Class:Machinery and Engineering Tools > Cutting Tools For Machine > HSS Step Drill Bits
Product Details
【DateTime:2016-03-30 Browse:】【Font: Big Mid Small】【Print】【Close
Spiral Flute HSS Step Drill Bits With Two Relief
        This step drill bits are quite different from normal one. It has two relief angles, First one for positive cutting and second one for clearance space cooling, guarantee competely pefect cooling result and extra longer life span.
Features:
    Smooth low-heat running
    Special relief angle design can be applied to straight flute type and spiral flute type
    Two relief angles.
    Made by high performance HSS, high wear resistance and long tool life.
    CBN fully ground ensure better and sharper cutting edges
    Grooves oppened wide to allow fast and easy chip removal
    Each steop has constant radially adjusted relief and axially relief
    Contered and drilled in one operation
    118  Degree Split point DIN1412C. little pressure required.
    Modified cutting angle made smooth running and positive cut possible.
Specification: 
Order No.
Size
Steps
Shank Size
STDR-30001
4 - 12mm
5 step
6mm/6.5mm
STDR-30002
4 - 12mm
9 step
6mm/6.5mm
STDR-30003
4 - 20mm
9 step
8mm
STDR-30004
4 - 22mm
10 step
10mm
STDR-30005
4 - 30mm
14 step
10mm
STDR-30006
4 - 39mm
13 step
10mm
STDR-30007
5 - 13mm
5 step
6.35mm
STDR-30008
5 - 25mm
11 step
9.5mm
STDR-30009
5 - 35mm
13 step
12.7mm
STDR-30010
6 - 20mm
8 step
9mm
STDR-30011
6 - 25mm
7 step
10mm
STDR-30012
6 - 32mm
9 step
10mm
STDR-30013
6 - 36mm
11 step
10mm
STDR-30014
6 - 38mm
12 step
10mm
STDR-30015
6 - 40mm
16 step
13mm
STDR-30016
9-36 mm
10 step
12mm
  

step drill

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