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

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Product Specifications
Cutting Direction
Finish Types
Uncoated (Bright)
Shank Type
Material Type
Carbide Tipped
Drill Point
Cutting Angle
118  Degrees
Brand Name
Precision Twist
Flute Type

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Size Mfg Series # System of Measurement Flute Length Overall Length Pkg Qty Mfr Part # ASIN

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Currently showing 1-20 of 25 Next 5 »
1/8" D444 Inch 1-5/8" 2-3/4" 1 34408 B003JTI8FI Usually ships in 9 to 11 days $17.55 Buy Options
9/64" D444 Inch 1-3/4" 2-7/8" 1 34409 B003JTI8QW Usually ships in 9 to 11 days $17.96 Buy Options
5/32" D444 Inch 2" 3-1/8" 1 34410 B003JTI8PS Usually ships in 9 to 11 days $19.82 Buy Options
11/64" D444 Inch 2-1/8" 3-1/4" 1 34411 B003JTI8GM yes $17.00 Buy Options
3/16 " D444 Inch 2-5/16" 3-1/2" 1 34412 B003JTI8NK yes $19.96 Buy Options
13/64" D444 Inch 2-7/16" 3-5/8" 1 34413 B003JTI8IA yes $18.59 Buy Options
7/32" D444 Inch 2-1/2" 3-3/4" 1 34414 B003JTI8QC yes $21.21 Buy Options
15/64" D444 Inch 2-5/8" 3-7/8" 1 34415 B003JTI8JE yes $21.56 Buy Options
1/4" D444 Inch 2-3/4" 4" 1 34416 B003JTI8EY yes $21.76 Buy Options
17/64" D444 Inch 2-7/8" 4-1/8" 1 34417 B003JTI8JY yes $22.40 Buy Options
9/32" D444 Inch 2-15/16" 4-1/4" 1 34418 B003JTI8QM yes $7.72 Buy Options
19/64" D444 Inch 3-1/16" 4-3/8" 1 34419 B003JTI8KI yes $23.42 Buy Options
5/16" D444 Inch 3-3/16" 4-1/2" 1 34420 B003JTI8P8 yes $23.16 Buy Options
21/64" D444 Inch 3-5/16" 4-5/8" 1 34421 B003JTI8KS yes $24.26 Buy Options
11/32" D444 Inch 3-7/16" 4-3/4" 1 34422 B003JTI8G2 yes $24.01 Buy Options
23/64" D444 Inch 3-1/2" 4-7/8" 1 34423 B003JTI8LC yes $25.20 Buy Options
3/8 " D444 Inch 3-5/8" 5" 1 34424 B003JTI8O4 yes $24.91 Buy Options
25/64" D444 Inch 3-3/4" 5-1/8" 1 34425 B003JTI8LW yes $27.10 Buy Options
13/32" D444 Inch 3-7/8" 5-1/4" 1 34426 B003JTI8H6 yes $26.24 Buy Options
27/64" D444 Inch 3-15/16" 5-3/8" 1 34427 B003JTI8MG yes $27.93 Buy Options

Key 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

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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