Automotive Holiday Deals Books Gift Guide Books Gift Guide Shop Men's Athletic Shoes Learn more nav_sap_SWP_6M_fly_beacon Indie for the Holidays egg_2015 All-New Amazon Fire TV Grocery Gifts Under $50 May The Best Garden Be Yours Amazon Gift Card Offer bf15 bf15 bf15 $30 Off Amazon Echo $15 Off All-New Fire Kindle Black Friday Deals Black Friday Video Game Deals Outdoor Deals on DOTD

0 items added

To add items, choose from the table below

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

Union Butterfield 4531 High-Speed Steel Expansion Chucking Reamer, Straight Flute, Round Shank, Uncoated (Bright)

Available in multiple versions

2 customer reviews

Price: $56.95 - $261.80
Product Specifications
Brand Name Precision Twist
Material Type High Speed Steel
Finish Types Uncoated (Bright)
Cutting Direction Right-Hand
Cutting Length 1.1/8  inches
Shank Type Round
UNSPSC Code 23241611

The Union Butterfield 4531 high-speed steel straight flute expansion chuck... Read full product description

Currently showing 1-20 of 41 Next »
System of Measurement Size Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
Inch 1 in B003JY6OX6
Inch 1-1/16" B003JY6OXQ
Inch 1-1/2" B003JY6OYA
Inch 1-1/32" B003JY6OYU
Inch 1-1/4" B003JY6OZ4
Inch 1-1/8" B003JY6OZY
Inch 1-11/16" B003JY6P0I
Inch 1-13/16" B003JY6P12
Inch 1-15/16" B003JY6P1C
Inch 1-3/16" B003JY6P1W
Inch 1-3/32" B003JY6P2G
Inch 1-3/4" B003JY6P30
Inch 1-3/8" B003JY6P3U
Inch 1-5/16" B003JY6P44
Inch 1-5/32" B003JY6P4O
Inch 1-5/8" B003JY6P58
Inch 1-7/16" B003JY6P62
Inch 1-7/32" B003JY6P6C
Inch 1-7/8" B003JY6P76
Inch 1-9/16" B003JY6P7G
Currently showing 1-20 of 41 Next »
Could not load your selection

We're sorry. An error occured when we tried to load your product family table. Rest assured, we're working to resolve the problem as soon as possible. Please refresh the page.

Product 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 Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B003TO4VRW
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (2 customer reviews)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description

The Union Butterfield 4531 high-speed steel straight flute expansion chucking reamer (also called a machine reamer) is an uncoated (bright) round 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 using a screw in the center of the reamer 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. This tool can be used in a drill press, screw machine, or lathe, or other good-quality toolholders.

Straight flute reamers make small, circular, and precise enlargements to through and blind holes. They can be used on a wide variety of materials. Round shanks aid accurate centering; they are designed to be held in a chuck or collet for high-torque applications. High-speed steel (HSS) 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. This reamer has a 45-degree bevel lead at the cutting tip to facilitate entry to pre-drilled holes.

In the Union Butterfield 4531 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 1.8125” in diameter have ten flutes, and 1.8750” to 2.0000” in diameter have 12 flutes. Tolerances for 0.3750” to 1.0000” reamers are +0.0001” to +0.0005” and tolerances for 1.0312” to 2.0000” 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.

Customer Reviews

5 star
4 star
3 star
2 star
1 star
See both customer reviews
Share your thoughts with other customers

Most Helpful Customer Reviews

By Gary Mast on October 17, 2015
Size: 3/8 inSystem of Measurement: Inch Verified Purchase
Just what was needed to finish the job
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
By Tazy on October 23, 2015
Size: 1 inSystem of Measurement: Inch Verified Purchase
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse