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1/2" Cobalt 135 Deg. Jobber Length Drill Bit

  • Zoro #: G0124393
  • Mfr #: R88CO1/2

$48.80 /ea

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  • Item: HSS-E Jobber Drill,Bronze,1/2"
  • Drill Bit Dimension Type: Fractional Inch
  • Drill Bit Material: Cobalt
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Precision Twist Drill #R88CO1/2 Specifications

  • Zoro #: G0124393
  • Mfr #: R88CO1/2
Item: HSS-E Jobber Drill,Bronze,1/2" Drill Bit Dimension Type: Fractional Inch
Drill Bit Material: Cobalt Drill Bit Finish: Bronze Oxide
Drill Bit Grouping: Drill Bit Coolant Through: No
Drill Bit Point Angle: 135 Degrees Point Type: Self Centering Split Point
Shank Dia.: 1/2" Material: Cobalt
Cutting Direction: Right Hand Drill Bit Size: 1/2"
Country of Origin (subject to change): Brazil
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Description

The Precision Twist R88CO jobber-length drill bit is a 135-degree, split-point, heavy-duty, round shank drill bit made of high speed steel (HSS) and cobalt with a gold oxide finish. They meet NAS 907 type D aircraft industry specifications for heat resistance and use for drilling hard, tough materials. Best performance is with drilling into hardened, tempered alloy steel, nodular graphite malleable cast iron, titanium, and alloyed nickel. It is suitable for drilling to a depth up to four times the diameter of the drill. The shank diameter is the same as the drill size. While the R88CO series was designed for the aircraft industry, they also work well for drilling into a variety of materials. The 135-degree split point drill geometry helps ensure an accurate hole by reducing walking when the hole is started. The finish retains lubricants to aid in wear resistance and chip flow. The R88CO series has a type N flute form (a regular helix angle of21 to 34 degrees). The gold oxide is a low temperature heat treatment which reduces grinding stress within the tool, and has an appealing, easy-to-identify gold color. Gold oxide is commonly used to identify cobalt steel tools. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. Right-hand twist brings chips up and away from the cutting edge. Made of HSS with cobalt is many times harder/stiffer than HSS, and it will hold an edge longer, and deflect less than HSS. It is also more resistant to heat than HSS. These qualities allow it to run at higher speeds and feeds. They are made to ANSI (fractional sizing) and NAS 907 type D industry standards, which help ensure that drill bits around the world conform to the same specifications. and away from the cutting edge.

 

Restrictions and Compliance

WARNING : Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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