Click for larger image and other views Image is representative of the product family. Select individual products in the table below for more specific images and product specifications

How can we improve our images or Product Specifications?

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

Be the first to review this item

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

This item is no longer available

These items ship for FREE with 2-Day Shipping on orders over $50. (Details)

Want it delivered on Tue, Apr 28? Order in-stock items in the next 1 day 10 hrs 31 mins and choose One-Day Shipping at checkout.

  • Share
Currently showing 1-20 of 37 Next 17 »
Measurement system Size name ASIN

The Amazon Standard Item Number (ASIN) uniquely identifies
the item in the (and Amazon) catalog.


If an item is currently out of stock, but has an estimated lead time, you can place an order now and we will ship it as soon as it is available.
You can also order more than we currently have in stock.
Read more about back orders in our help section.

All All      
Currently showing 1-20 of 37 Next 17 »
Inch 1 in B003JY6PJE yes $129.91 Buy Options
Inch 1/2 in B003JY6PSK yes $20.87 Buy Options
Inch 2 in B003JY6PX0 yes $290.88 Buy Options
Inch 3/8 in B003JY6Q0W yes $66.18 Buy Options
Inch 1-1/16" B003JY6PJY yes $127.54 Buy Options
Inch 1-1/2" B003JY6PKI yes $210.76 Buy Options
Inch 1-1/32" B003JY6PL2 Usually ships in 24 hours $129.52 Buy Options
Inch 1-1/4" B003JY6PLM yes $172.86 Buy Options
Inch 1-1/8" B003JY6PM6 yes $41.15 Buy Options
Inch 1-3/16" B003JY6PMQ yes $160.71 Buy Options
Inch 1-3/32" B003JY6PNK yes $40.31 Buy Options
Inch 1-3/4" B003JY6PO4 yes $68.28 Buy Options
Inch 1-3/8" B003JY6POE yes $55.28 Buy Options
Inch 1-5/16" B003JY6PP8 yes $49.47 Buy Options
Inch 1-5/32" B003JY6PPS yes $153.24 Buy Options
Inch 1-5/8" B003JY6PQC yes $218.85 Buy Options
Inch 1-7/16" B003JY6PQW yes $54.78 Buy Options
Inch 1-7/32" B003JY6PRG yes $171.52 Buy Options
Inch 1-7/8" B003JY6PS0 yes $278.06 Buy Options
Inch 11/16" B003JY6PT4 yes $25.58 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.

How can we improve our Product Description?

Customer Reviews

There are no customer reviews yet.

Be the first to review this item

Go to the HomePage

Order by Phone
M-F 8am-10pm ET, Sat-Sun 8am-5pm ET 800-220-4242

My Account| Returns| Help

Website Feedback| Contact Us| Sell on AmazonSupply| Become an Affiliate

Privacy Notice| Conditions of Use

Follow Us 

© 2015, Inc. and its affiliates.