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Precision Twist 500-12 High-Speed Steel Extension Drill Bit, Black Oxide Finish, Round Shank, Spiral Flute, 135 Degree Point Angle

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Product Specifications
Cutting Direction
right-hand
Finish Types
Black Oxide
Shank Type
Round
Material Type
High Speed Steel
Drill Point
Split
Style Name
Extension
Brand Name
Precision Twist
Flute Type
Spiral

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Price  
All All All All All All      
Currently showing 1-15 of 15
1/16" 500-12 Inch 7/8" 12" 12 59004 B0026H7FQM 1 $114.26 Buy Options
3/32" 500-12 Inch 1-1/4" 12" 12 59006 B002KNE2ZO 1 $107.04 Buy Options
11/64" 500-12 Inch 2-1/8" 12" 12 59011 B00271JCWC 1 $104.07 Buy Options
13/64" 500-12 Inch 2-7/16" 12" 6 59013 B002E8XQKW 1 $61.12 Buy Options
1/4" 500-12 Inch 2-3/4" 12" 6 59016 B002091OR2 1 $63.66 Buy Options
17/64" 500-12 Inch 2-7/8" 12" 6 59017 B0025Q9U0S 1 $80.15 Buy Options
9/32" 500-12 Inch 2-15/16" 12" 6 59018 B00271C5PI 1 $81.69 Buy Options
11/32" 500-12 Inch 3-7/16" 12" 6 59022 B00271G5EK 1 $107.81 Buy Options
23/64" 500-12 Inch 3-1/2" 12" 3 59023 B00271JD26 1 $50.59 Buy Options
3/8 " 500-12 Inch 3-5/8" 12" 3 59024 B0025Q9U1M 1 $62.05 Buy Options
13/32" 500-12 Inch 3-7/8" 12" 3 59026 B0025QBXYY 1 $69.00 Buy Options
29/64" 500-12 Inch 4-3/16" 12" 3 59029 B002E8VNGG 1 $67.77 Buy Options
15/32" 500-12 Inch 4-5/16" 12" 3 59030 B0025QBY2A 1 $69.98 Buy Options
31/64" 500-12 Inch 4-3/8" 12" 3 59031 B0025Q9U62 1 $72.50 Buy Options
1/2 " 500-12 Inch 4-1/2" 12" 3 59032 B0025QHUNM 1 $87.27 Buy Options

Key Features

  • NAS 907 type B standards, for use in the aerospace industry
  • Extra-length drill bits, for providing a long reach
  • 135-degree split-point angles is self-centering, to reduce walking, to use with hard materials, and to reduce pressure on cutting edges
  • Steam Tempering (also called black oxide), to retain cutting fluids and to prevent chip-to-tool welding
  • High-speed steel (HSS), for use on a wide variety of materials

Product Description

The Precision Twist 500-12 extra-length, aircraft extension drill bit, is a round shank bit made of HSS with a Steam Tempering finish. 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. For best performance, use for drilling into hardened, tempered alloy steel, stainless steel, and titanium, all of which should be less than 30 on the Rockwell C hardness scale.

While the 500-12 series was designed for the aircraft industry, it also works well for drilling into a variety of materials. The extra length and 135-degree split-point drill geometry provide extra reach and ensure a more accurate hole by reducing walking when the hole is started. The finish retains lubricant to aid in wear resistance and chip flow.

Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits can be used in hand-operated drills, standalone drill presses, or a lathe. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. These drill bits have a right-hand twist that brings the chips up and away from the cutting edge. They are made to NAS 907 type B industry standards, which ensure that drill bits around the world, confirm to the same specifications.

Together, the Precision Twist and Dormer brands represent a strong tool brand for high-productivity carbide and high-speed steel drill and tap products. Precision was founded in 1952 in Crystal Lake, IL. Dormer Tools, founded in 1913 in Sheffield, England, is known for innovative metalworking products.

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