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  • Precision Twist C29R40C High Speed Steel Short Length Drill Bit Set, Black Oxide Finish, 135 Degree Point, Inch, 29 piece, 1/16" to 1/2" x 64ths
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Precision Twist C29R40C High Speed Steel Short Length Drill Bit Set, Black Oxide Finish, 135 Degree Point, Inch, 29 piece, 1/16" to 1/2" x 64ths

1 customer review

List Price: $236.00
Price: $160.11 & FREE Shipping. Details
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Specifications for this item
Brand Name Precision Twist
Part Number 99903
Material Type High-Speed Steel
Finish Types Black Oxide
Number of Items 1
UPC 086071999030
Cutting Angle 135  Degrees
Cutting Direction Right-Hand
Drill Point split
EAN 0086071999030
Flute Type Spiral
Manufacturer Series Number C29R40C
Shank Type Round
Size 1/16" - 1/2" x 64ths
Style Name Stub
System of Measurement Inch
UNSPSC Code 20121600

This Precision Twist C29R40C short length drill bit set contains 29 high-sp... Read full product description



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Product Features

  • Set of 29 short length drill bits includes inch sizes 1/16" through 1/2" in 1/64" increments
  • High-speed steel (HSS) provides hardness for wear resistance
  • Black oxide finish reduces bit wear while promoting chip and coolant flow on ferrous material
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Drill bits conform to ANSI standards


Product Details

  • Shipping Weight: 3 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B00209448I
  • Item model number: 099903
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Best Sellers Rank: #215,230 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

This Precision Twist C29R40C short length drill bit set contains 29 high-speed steel drill bits, including inch sizes 1/16" through 1/2" in 1/64" increments, with a black-oxide finish and a 135-degree split point for increased rigidity in heavy feed-rate drilling applications on ferrous material. High-speed steel (HSS) provides hardness for wear resistance, and the black oxide finish acts as a lubricant to reduce wear while promoting chip and coolant flow. Compared to standard drill bits, these tools have a thicker web for increased strength and rigidity. The self-centering 135-degree split penetrates hard material without a pilot hole and produces smaller chips, which are less likely to clog a hole than a 118-degree point. These short length drill bits have a drilling depth of up to 2.5 times their diameter. The round shank accommodates most drill chucks. The set comes in a metal index case with labeled compartments for identification and organization. Drill bits conform to American National Standards Institute (ANSI) standards.

Drill bits are cutting tools used to make holes in a range of materials using machines such as handheld portable drills, machining centers, and lathes. Drill bits come in a variety of lengths and types, the most common of which is the twist drill bit. The round, twisted shaft of the twist drill bit typically has two cutting edges and flutes. The helical twist of the flutes brings chips up and away from the cutting edges and allows for coolant to reach the cutting edges. Jobber length twist drill bits, the most common length of twist drill bit, offer a good compromise of length and reach to work with the widest range of materials and applications. Mechanic's length twist drill bits (also called maintenance length) are a little shorter than jobber length and less prone to deflection when drilling. Short length twist drill bits (also called stub or screw-machine length) are the shortest and stiffest twist drill bits, helping to reduce the chance of deflection or breakage when drilling. Reduced shank drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than its shaft, permitting drilling machines with either a 1/2" or 3/4" drill chuck to create large holes. Long length twist drill bits (also called taper length) are a little longer than jobber length, allowing for deeper holes and longer reach. Extra long twist drill bits (also called extension) are longer than long length twist drill bits for greater reach or for drilling deeper holes.

Precision Dormer manufactures cutting tools under the brands Precision Twist, Dormer, and Union Butterfield. The company, headquartered in Crystal Lake, IL, meets International Organization for Standardization (ISO) standards 9001 and 14000.

What’s in the Box?

  • 29 drill bits, inch sizes 1/16" through 1/2" in 1/64" increments
  • Metal case


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Most Helpful Customer Reviews

By tinbender66 on October 19, 2012
Verified Purchase
If you own a drill press and use it, a quality set of bits is essential. This set fills the bill! Not cheap, but worth every penny.
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