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Union Butterfield 4579 High-Speed Steel Construction Reamer, Right Hand Spiral Flute, Morse Taper Shank, Uncoated (Bright) Finish

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Product Specifications
Cutting Direction
Right-Hand
Cutting Length
7.3/8  inches
Finish Types
Uncoated (Bright)
Shank Type
Morse Taper
Material Type
High Speed Steel
Brand Name
Precision Twist
Flute Type
Right Hand Spiral

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Currently showing 1-15 of 15
1/4" Inch 0.2500" 8-1/4" 5011055 B003JY6V3Y 1 $46.46 Buy Options
9/32" Inch 0.2812" 9" 5011056 B003JY6V0M 1 $47.66 Buy Options
11/32" Inch 0.3437-0.5625" 9" 5011057 B003JY6V4S 1 $53.17 Buy Options
3/8 " Inch 0.3750" 10" 5011058 B003JY6V34 1 $58.18 Buy Options
25/64" Inch 0.3906" 11-3/4" 5011059 B003JY6V1G 1 $71.21 Buy Options
7/16" Inch 0.4375" 12" 5011060 B003JY6V2K 1 $74.04 Buy Options
1/2 " Inch 0.5000" 12" 5011061 B003JY6V1Q 2 $73.58 Buy Options
9/16" Inch 0.5625" 12" 5011062 B003JY6V4I 1 $87.80 Buy Options
5/8" Inch 0.6250-0.9375" 12" 5011063 B003JY6V20 1 $74.54 Buy Options
11/16" Inch 0.6875" 12" 5011064 B003JY6UXK 1 $102.80 Buy Options
3/4" Inch 0.7500" 12" 5011065 B003JY6UYE 1 $108.18 Buy Options
13/16" Inch 0.8125" 12" 5011066 B003JY6UZ8 1 $120.91 Buy Options
7/8" Inch 0.8750" 12" 5011067 B003JY6UZS 1 $146.21 Buy Options
15/16" Inch 0.9375" 13" 5011068 B003JY6UYY 1 $149.69 Buy Options
1" Inch 1.0000" 13" 5011069 B003JY6V0C 1 $173.36 Buy Options

Key Features

  • Spiral construction protects interrupted cuts by preventing whole-flute contact with the leading edge of the interruption
  • Left-hand spiral design pushes chips ahead of the tool into the hole
  • Morse taper shank for accurate alignment and firm hold in the socket of a tool holder
  • Black oxide coating will not chip; improves lubricity, resists corrosion, and helps to prevent buildup and welding on the cutting edge
  • High-speed steel (HSS) is compatible with a variety of materials

Product Description

The Union Butterfield 4579 high-speed steel left hand spiral flute bridge reamer is a Morse taper shank tool with a black oxide finish, commonly used for reaming interrupted cuts in structural steel. Bridge reamers are tapered to allow the reamer to enter overlapping and misaligned holes where extremely precise tolerances are not necessary. Spiral construction prevents whole-flute contact with the leading edge in an interrupted cut, as in a keyway. This reduces the possibility of damage to the interruption and to the reamer flute. Left-hand spiral tools are good for use in through holes (extending through the workpiece) because they push chips ahead of the tip of the tool.

High-speed steel (HSS) is a common, general-purpose steel for cutting tools and is compatible with a variety of materials. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials and provide an economical alternative to coated tools. Taper shank tools can be self-holding or self-releasing based on the degree of taper: Small tapers are self-holding within a tool holder, while large tapers are self-releasing and will easily release from the tool holder. The shank end of a Morse taper shank tool is self-holding because friction between the tool and the tool holder prevents slippage. It is tapered to ensure accurate alignment of the tool in the socket of the tool holder. Black oxide improves lubricity, resists corrosion, and will not chip or flake; it also helps to prevent buildup and welding of material on the tool’s cutting edge when it is used on iron and steel.

In the Union Butterfield 4579 series, all reamers have three flutes. Tolerances for all reamers in this series are +0.0100” to -0.0000”.

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.

Precision Dormer manufactures cutting tools under the brands Precision Twist, Dormer, and Union Butterfield. The company has locations around the world, and makes tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut für Normung (DIN) standards.

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