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4DN51 Cobalt Jobber-Length Drill Bits

$41.13

Bulk orders will be discounted, please contact us.

These drill bits meet National Aerospace Specification (NAS) 907 Type J for drill bits used in aircraft repair and production. They have a have a straw/bronze finish that improves their wear resistance, and they have spiral flutes that evacuate chips as the bits drill into a workpiece.

Product Number: 4DN51

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  • Description
Mfr Model 50075
Measurement System Fractional Inch
Drill Bit Size 33/64 in
Decimal Equivalent 0.5156
Maximum Drilling Depth 3-39/64 in
Overall Length 6-5/8 in
Shank Diameter 1/2 in
Shank Type Machining Straight
Finish Machining Straw/Bronze
Material Machining Cobalt
Primary Material Application Hi-Temp Alloy; Stainless Steel; Steel
UNSPSC 23171609
Country of Origin USA (subject to change)
Cutting Direction Right Hand
Flute Length 4-13/16 in
Flute Type Spiral
Standards NAS 907 Type J
Series 550
Drill Bit Point Angle 135 °
Drill Bit Point Type Split Point
Number of Flutes 2
Spiral Direction Right Hand
Helix Angle 21° to 34°
Depth Dia Ratio 4xD
Primary Material Application ISO Code M; P; S
Material Grade Machining M42
Drill Length Class Jobber Length
Sheeter Drill No
Drill Point Length 0.1068 in
Shank Length 1-13/16 in
Coolant Fed Non-Coolant Through
Drill Diameter Tolerance +0.0000 in/-0.0012 in
Secondary Material Application Aluminum; Cast Iron; Hardened Steel; High Carbon Steel; Stainless Steel
Secondary Material Application ISO Code H; K; M; N; P
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