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439A57 Taper-Shank Drill Bits

$10.81

Bulk orders will be discounted, please contact us.

These bits have a straw/bronze finish that improves their wear resistance. Cobalt drill bits tolerate higher drilling speeds and are harder and more wear-resistant than high-speed steel drill bits. They provide some shock absorption and can be used in handheld power tools. These bits have spiral flutes that evacuate chips as the bits drill into a workpiece.

Product Number: 439A57

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  • Description
Mfr Model 53028
Measurement System Fractional Inch
Drill Bit Size 7/16 in
Decimal Equivalent 0.4375
Maximum Drilling Depth 3-7/8 in
Overall Length 7-3/4 in
Shank Type Machining Taper
Finish Machining Straw/Bronze
Material Machining Cobalt
Primary Material Application Cast Iron; Stainless Steel; Steel; Tool and Die Steel
UNSPSC 27112801
Country of Origin USA (subject to change)
Cutting Direction Right Hand
Flute Length 3-7/8 in
Flute Type Spiral
Standards ANSI
Drill Bit Point Angle 135 °
Drill Bit Point Type Notched Point
Number of Flutes 2
Spiral Direction Right Hand
Helix Angle 28°
Depth Dia Ratio 4xD
Primary Material Application ISO Code K; M; P
Material Grade Machining M42
Coolant Fed Non-Coolant Through
Drill Diameter Tolerance +0.0000 in /-0.0010 in
Secondary Material Application Non Ferrous
Secondary Material Application ISO Code M

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