13pk, Drillco Jobber Length Drill Bit, #57, Point Angle 135°, High Speed Steel (SQ8685149WT14)
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The black-and-gold finish on these drill bits lubricates the bits and provides some resistance to wear and rust. These bits have spiral flutes that evacuate chips as the bits drill into a workpiece. They also have flats on their shank that help prevent the bits from slipping in a drill chuck when drilling at high speeds or under heavy loads.
Non-coolant-through high-speed steel jobber-length drill bits do not have coolant holes, so a separate hose is required to bring coolant to the bits' tip if it is needed. High-speed steel drill bits provide more flexibility and absorb more shock and vibration than cobalt, powdered-metal, and carbide drill bits, making them suitable for use in manual drilling machines and handheld power tools. They may leave a rough finish on the hole. Jobber-length drill bits are the most commonly used drill-bit length. They provide a good balance of strength and accuracy when drilling into a range of materials.
Item: Jobber Length Drill Bit
Drill Bit Size: #57
Decimal Equivalent: 0.043
Measurement System: Wire
Material - Machining: High Speed Steel
Finish - Machining: Black & Gold
Drill Bit Point Angle: 135 Degrees
Drill Bit Point Type: Split Point
Coolant Fed: Non-Coolant Through
Flute Type: Spiral
Number of Flutes: 2
Flute Length: 3/4"
Maximum Drilling Depth: 0.172"
Helix Angle: 28 Degrees
Cutting Direction: Right Hand
Spiral Direction: Right Hand
Shank Type - Machining: Straight
Shank Dia.: 0.043"
Shank Length: 1"
Overall Length: 1-3/4"
Depth:Dia. Ratio: 4xD
Drill Length Class: Jobber Length
Drill Point Length: 0.0089"
Drill Bit Grouping: Individual
Standards: ASME B94.11M
Drill Diameter Tolerance: +0"/-0.0005"
Primary Material Application: Cast Iron, Steel
Primary Material Application ISO Code: K, P