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Precision Twist R57 High Speed Steel Reduced Shank Drill Bit, Uncoated (Bright) and Black Oxide Finish, 1/2" Reduced Shank, 118 Degree Conventional Point

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Product Specifications
Cutting Direction
Finish Types
Uncoated (Bright)
Shank Type
Material Type
High-Speed Steel
Drill Point
Cutting Angle
118  Degrees
Brand Name
Precision Twist
Flute Type

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Currently showing 1-20 of 56 Next 20 »
33/64" R57 Inch 3" 6" 1 91533 B003JTIJGQ yes $32.67 Buy Options
17/32" R57 Inch 3" 6" 1 91534 B003JTIJD4 yes $26.40 Buy Options
35/64" R57 Inch 3" 6" 1 91535 B003JTIJHA yes $25.29 Buy Options
9/16" R57 Inch 3" 6" 1 91536 B003JTIJNY yes $27.06 Buy Options
37/64" R57 Inch 3" 6" 1 91537 B003JTIJHK yes $28.06 Buy Options
19/32" R57 Inch 3" 6" 1 91538 B003JTIJDO yes $28.20 Buy Options
39/64" R57 Inch 3" 6" 1 91539 B003JTIJI4 yes $39.13 Buy Options
5/8" R57 Inch 3" 6" 1 91540 B003JTIJKM Usually ships in 10 to 12 days $29.56 Buy Options
41/64" R57 Inch 3" 6" 1 91541 B003JTIJIE yes $32.42 Buy Options
21/32" R57 Inch 3" 6" 1 91542 B003JTIJDY yes $27.91 Buy Options
43/64" R57 Inch 3" 6" 1 91543 B003JTIJIY yes $33.66 Buy Options
11/16" R57 Inch 3" 6" 1 91544 B003JTIJC0 yes $29.52 Buy Options
45/64" R57 Inch 3" 6" 1 91545 B003JTIJJ8 yes $43.74 Buy Options
23/32" R57 Inch 3" 6" 1 91546 B003JTIJEI yes $33.01 Buy Options
47/64" R57 Inch 3" 6" 1 91547 B003JTIJJS yes $43.45 Buy Options
3/4" R57 Inch 3" 6" 1 91548 B003JTIJFW yes $43.87 Buy Options
49/64" R57 Inch 3" 6" 1 91549 B003JTIJKC yes $39.66 Buy Options
25/32" R57 Inch 3" 6" 1 91550 B003JTIJES yes $33.34 Buy Options
51/64" R57 Inch 3" 6" 1 91551 B003JTIJKW yes $44.45 Buy Options
13/16" R57 Inch 3" 6" 1 91552 B003JTIJCA yes $50.30 Buy Options

Key Features

  • Half-inch round 3-flats shank, to allow larger-sized drills to fit into small-size chucks securely
  • Combination black oxide and uncoated (bright) finish, for improved lubricity, corrosion resistance, and to reduce chipping or flaking
  • Jobber-length drill bits, for use on a wide range of applications
  • 118-degree conventional point angles, for general drilling applications
  • High-speed steel (HSS), for use on a wide variety of materials

Product Description

The Precision Twist R57 Jobber-length, uncoated, general-purpose, 3-flat round-shank drill bit drills holes into a wide variety of metals and synthetic materials with the best performance with steel, stainless steel, cast iron, titanium, and nickel. It can drill to a depth up to four times the diameter of the drill size. The flute length is three inches, overall length is six inches, with a half-inch, reduced shank.

The three flats on the shank are a modification of a straight shank. This allows it to be held in a 3-jaw drill chuck, but not in a collet. This system provides higher torque transmission with limited slipping than a standard straight shank drill bit.

Combination black oxide and uncoated finish improves lubricity, resists corrosion, and will not chip or flake off. Black oxide also helps to prevent buildup and welding of material on the cutting edge when working with iron and steel.

Reduced shanks are smaller than the drill diameter, so they can drill holes larger than the typical chuck capacity. These are sometimes called Silver & Deming drills, which were made by Silver & Deming in the late 1800s. Today, this means any reduced shank twist drill bit.

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 ANSI standards, which helps ensure that drill bits around the world, conform to the same specifications.

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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