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Union Butterfield 4533 High-Speed Steel Chucking Reamer, Straight Flute, Round Shank, Uncoated (Bright)

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Product Specifications
Cutting Direction
Cutting Length
1.1/2  inches
Finish Types
Uncoated (Bright)
Shank Type
Material Type
High Speed Steel
Brand Name
Precision Twist

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Key Features

  • Straight flute for general-purpose reaming of uninterrupted cuts in through holes and blind holes
  • High-speed steel is compatible with a variety of materials
  • Uncoated (bright) tools have no additional surface treatment or coating, suitable for general-purpose applications
  • 45-degree bevel at the cutting tip facilitates entry to a pre-drilled hole
  • Round shank aids accurate centering; designed to be held in a chuck or collet for high-torque applications

Product Description

The Union Butterfield 4533 high-speed steel straight flute chucking reamer (also called a machine reamer) is an uncoated (bright) round shank tool with a 45-degree bevel lead, commonly used for general-purpose reaming of uninterrupted cuts. This tool is often used in a drill press, screw machine or lathe. Straight flute reamers are useful for uninterrupted cuts in general-purpose applications. They make small, circular, and precise enlargements to through holes (extending through the workpiece) and blind holes (with only one opening). They can be used on a wide variety of materials including cast iron, aluminum, and tool steel. High-speed steel is a general-purpose steel for cutting tools and is compatible with many metalworking materials. It is often lower in price than other cutting tool substrates. Like most non-tapered chucking reamers, the Union Butterfield 4533 has a 45-degree bevel at the cutting tip that facilitates entry to a pre-drilled hole.

In the Union Butterfield 4533 series, reamers 0.0400 to 0.1540” diameter have four flutes reamers 0.1562 to 0.5312” diameter have six flutes, and reamers 0.5469 to 1.5000” diameter have eight flutes. Tolerances for reamers up to 0.5000” are +0.0002 to -0.0000”; larger than 0.5000” and up to 0.7500” are +0.0003 to -0.0000”, and larger than 0.7500” up to 1.5000” are +0.0004 to -0.0000”. There is an exception for reamers that are dowel-pin sized, in which cases tolerances are +0.0000 to -0.0002”.

Reamers are used to finish existing holes. When holes are created using common applications such as drilling or punching, they often have minute imperfections. Their roundness may be flawed, or their diameters may be slightly smaller than required. Reamers are made to exacting tolerances, so they can correct such errors and create precisely round holes with exact dimensions. Reaming is often used before tapping screw threads.

Union Butterfield manufactures a range of machine tools, including drills, reamers, taps, dies, end mills, and made-to-order items. Formed in 1913, the company is a subsidiary of Sandvik, a Swedish machine tool corporation. Union Butterfield offices and manufacturing facilities are located in the United States.

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