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Precision Twist D444 Carbide Tipped Jobber Drill Bit, Uncoated (Bright) Finish, Round Shank, Spiral Flute, 118 Degree Point Angle

Available in multiple versions

Price: $5.45 - $47.84
Product Specifications
Brand Name Precision Twist
Material Type Carbide Tipped
Finish Types Uncoated (Bright)
Cutting Angle 118  Degrees
Cutting Direction Right-Hand
Drill Point Conventional
Flute Type Spiral
Shank Type Round
UNSPSC Code 20121600

The Precision Twist D444 jobber-length, carbide-tipped, round shank drill bit performs best wh... Read full product description

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Size Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
1/2 in B003JTI8EE
1/4 in B003JTI8EY
1/8 in B003JTI8FI
11/32" B003JTI8G2
11/64" B003JTI8GM
13/32" B003JTI8H6
13/64" B003JTI8IA
15/32" B00086H6C6
15/64" B003JTI8JE
17/64" B003JTI8JY
19/64" B003JTI8KI
21/64" B003JTI8KS
23/64" B003JTI8LC
25/64" B003JTI8LW
27/64" B003JTI8MG
29/64" B003JTI8N0
3/16 in B003JTI8NK
3/8 in B003JTI8O4
31/64" B003JTI8OO
5/16" B003JTI8P8
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Product Features

  • High-speed steel (HSS) with carbide-tipped cutting edges, for use on abrasive materials and for wear resistance
  • Jobber-length, for a wide range of applications
  • Round shanks, for use on a variety of tool-holding systems
  • 118-degree conventional point angles, for general drilling applications
  • Uncoated (bright), for use with a wide range of drilling materials

Special Offers and Product Promotions

Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B004P8JRN4
  • Product Warranty: For warranty information about this product, please click here

Product Description

The Precision Twist D444 jobber-length, carbide-tipped, round shank drill bit performs best when drilling holes into cast iron. It can drill to a depth up to four times the diameter of the drill size. The shank diameter is the same as the drill size.

The D444 series has a type N flute form, with a regular helix (21 to 34 degrees) angle. Uncoated (bright) tools have no finish or coating. They are a common choice for general use applications. The round shank with tang provides a means to securely hold the drill bit in the tool holder. 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.

It is tipped with carbide (a metallic carbide composite with binder material), which is much harder and stiffer than high-speed steel (HSS), and will hold an edge longer, and deflect less than HSS. These are 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) industry standards, which help ensure that drill bits around the world confirm to the same specifications.

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.

Precision manufactures machine tools under the following brands: Precision Twist, Precision Dormer, and Union Butterfield. They have locations around the world, and provide tools adhering to ANSI, NAS, and DIN standards.

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