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Union Butterfield 4532 High-Speed Steel Expansion Chucking Reamer, Straight Flute, Morse Taper Shank, Uncoated (Bright)

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Product Specifications
Cutting Direction
Cutting Length
1.5/8  inches
Finish Types
Uncoated (Bright)
Shank Type
Morse Taper
Material Type
High Speed Steel
Brand Name
Precision Twist

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3/8 " Inch 0.3750" 7" 5011206 B003JY6Q0W yes $66.16 Buy Options
13/32" Inch 0.4062" 7" 5011207 B003JY6PU8 yes $21.24 Buy Options
7/16" Inch 0.4375" 7" 5010820 B003JY6Q2K yes $20.31 Buy Options
15/32" Inch 0.4687" 7" 5010821 B003JY6PVC yes $20.66 Buy Options
1/2 " Inch 0.5000" 8" 5010822 B003JY6PSK yes $20.89 Buy Options
17/32" Inch 0.5312" 8" 5010823 B003JY6PVW yes $22.05 Buy Options
9/16" Inch 0.5625" 8" 5010824 B003JY6Q3Y yes $22.51 Buy Options
19/32" Inch 0.5938" 8" 5010825 B003JY6PWG yes $23.09 Buy Options
5/8" Inch 0.6250" 9" 5010826 B003JY6Q20 yes $80.67 Buy Options
21/32" Inch 0.6562" 9" 5010827 B003JY6PXK yes $24.14 Buy Options
11/16" Inch 0.6875" 9" 5010828 B003JY6PT4 yes $25.59 Buy Options
23/32" Inch 0.7188" 9" 5010829 B003JY6PY4 yes $25.76 Buy Options
3/4" Inch 0.7500" 9-1/2" 5010830 B003JY6Q0C yes $100.40 Buy Options
25/32" Inch 0.7812" 9-1/2" 5010831 B003JY6PYO yes $27.73 Buy Options
13/16" Inch 0.8125" 9-1/2" 5010832 B003JY6PTO yes $97.90 Buy Options
27/32" Inch 0.8438" 9-1/2" 5010833 B003JY6PZ8 yes $29.33 Buy Options
7/8" Inch 0.8750" 10" 5010834 B003JY6Q34 yes $108.34 Buy Options
29/32" Inch 0.9062" 10" 5010835 B003JY6PZS yes $31.88 Buy Options
15/16" Inch 0.9375" 10" 5010836 B003JY6PUS yes $32.54 Buy Options
31/32" Inch 0.9688" 10" 5010837 B003JY6Q1G yes $33.80 Buy Options

Key Features

  • Expandable as wear decreases its cutting diameter, so it can be reground and re-sharpened to its original dimensions for increased life
  • Morse taper shank for accurate alignment and firm hold in the socket of a toolholder
  • Straight flute for general-purpose reaming of uninterrupted cuts in through holes and blind holes
  • 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 pre-drilled holes

Product Description

The Union Butterfield 4532 high-speed steel straight flute expansion chucking reamer (also called a machine reamer) is an uncoated (bright) Morse taper shank tool with a 45-degree bevel lead, commonly used for reaming of uninterrupted cuts in high-production runs on abrasive materials. An expansion reamer can be expanded with a screw as wear decreases its cutting diameter, so it can be reground to its original dimensions and re-sharpened to prevent rapid loss of reamer size or finish.

Straight flute reamers 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. High-speed steel is a general-purpose steel for cutting tools that is compatible with many metalworking materials and is often lower in price than other cutting tool substrates. Taper shank tools can be self-holding or self-releasing based on the degree of taper: Small tapers are self-holding within a toolholder, while large tapers are self-releasing and will easily release from the toolholder. 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 toolholder. This reamer has a 45-degree bevel lead at the cutting tip that facilitates entry to pre-drilled holes.

In the Union Butterfield 4532 series, reamers 0.3750” to 0.9688” in diameter have six flutes, 1.0000” to 1.3750” in diameter have eight flutes, 1.4375” to 1.7500” in diameter have ten flutes, and 1.8750” to 2.5000” in diameter have 12 flutes. Tolerances for 0.3750 to 0.9688” reamers are +0.0001” to +0.0005” and tolerances for 1.0000” to 2.5000” reamers are +0.0002 to +0.0006.

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 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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