FEATURES:
Manufactured from M35 cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.
No center punch is needed—the 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not "walk" or "wander"
Extremely heat resistant; Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks.
Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too.
Different types of drill bits are used to cut holes in different types of materials.
This set of M35 cobalt steel drill bits are particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too.
Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade.
The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit.
Cobalt drill bits are more expensive than other drill bits, but if you regularly drill through metal, they are a good investment since they tend to last longer.
USAGE SUGGESTION:
To avoid step drill bits become overheated and get burned up due to fast rotary friction,
we suggest customers to use cutting fluid to keep the bits cold during usage.
SPECIFICATION:
Material: M35 Cobalt Steel(5% Cobalt and 95% High Speed Steel)
Angle Point: 135 Degree
Hardness: Rockwell 67
Shank Type: straight shank
Step Sizes:
4-12mm: 5 steps (4mm, 6mm, 8mm, 10mm, 12mm)
4-20mm: 9 steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 14mm, 16mm, 18mm, 20mm)
4-32mm: 15 steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm)
Dimensions(L x W):
4-12mm:65*12mm
4-20mm: 75*20mm
4-32mm: 105*32mm
Shank Diameter：
4-12mm: 4mm
4-20mm: 6mm
4-32mm：10mm
Package Includes：
1 x M35 5% Co STEP DRILL BIT
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