#13 HSS Black Oxide 12 Inch OAL 135 Deg. Split Point Series 501-12 Aircraft Extension Drill

501-12 aircraft extension drill bits are available in a wide range of wire gauge sizes from 50 to 1 and are manufactured to NAS907 type B standard. Made from premium High Speed steel, the drill bits are suitable for drilling many different materials including steels, aluminum and stainless steel, and have a steam oxide finish which prevents workpiece material from sticking to the cutting surfaces of the tool, so you get a clean and accurate result. The 135 degree split point helps with self-centering and reduces the push force needed. 501-12 aircraft extension drills have a long overall length with a short flute which is especially recommended for stable drilling in areas which are hard to reach.


  • Item Code: 059113
  • Brand: Precision Twist Drill
  • Availability:
  • Mfg Part #: 059113

Unit Size: 1

Features Back To Top

    • Low thrust design self centering 135� Split Point for easier penetration
    • Steam Oxide for increased wear resistance & lubricity
    • 12�� Over All Length

Tech Specs Back To Top

Cutting Direction Right Hand
Flute Length 2-5/16"
Material High Speed Steel
Point Angle 135 Split Point
Series 501-12
Shank Type Straight
Specification Designation ANSI, NAS
Type Aircraft Extension Drill Bit
Brand Precision Twist Drill
Coating/Finish Steam Tempered
Cutting Direction Right
Decimal Equivalent 0.185
Decimal Size 0.185"
Grade Heavy Duty
Material High Speed Steel
Metric Size 4.7 mm
Number of Flutes 2
Overall Length 12"
Overall Length Inches 12"
Point Angle 135 Deg.
Shank Style Cylindrical shank
Wire Size #13

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