Best Expansion Reamers (Sep. 2026) - Rated by CherryPicks' Experts

At a Glance: Our Top Picks

Top 1

KnKut 3 Piece Hole Expansion Step Reamer Set

9.8
CPR Score
Top 2

Drill America 3/4" High Speed Steel Straight Shank Machine Expansion Reamer, ...

9.8
CPR Score
Top 3

Drill America DWRRHDE2INCH HSS Hand Expansion Reamer, 2"

9.7
CPR Score
Tips


Our team has analyzed 261 products of different Cutting Tools brands, including Generic, Drill America, Super Tool And KnKut. The following list of top 28 Expansion Reamers is prepared for the customers by analyzing 261 Expansion Reamers reviews and comparing different features. 

* CherryPicks.Reviews is reader-supported, Our editor review, and recommend the best products based on extensive data analysis, if you click on the product links, we may earn a commission through qualifying products purchased.

The Best Expansion Reamers Rated by CherryPicks

Market Overview
Expansion Reamers Reviewed
  • Reviews Analyzed: 14 Items
  • CPR Avg. Rating: 8.6 / 10
28 Products Evaluated
  • Highest Price: $704.39
  • Lowest Price: $20.99
  • Avg. Price: $113.17
Price Disclaimer

Top 28 Expansion Reamers on Amazon (Verified You can Buy)

Top 1

KnKut 3 Piece Hole Expansion Step Reamer Set

KnKut
3KK4SR
5.5 x 3.85 x 1.75 inches
1.0 Pounds

Ratings for KnKut (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Tooldom Tools -

Features

Size Range: 3 Piece Set Includes 5/16" - 9/16", 9/16" - 13/16", 13/16" - 1-1/16"
90° Notch Point starts holes easily
Show More
Top 2

Drill America 3/4" High Speed Steel Straight Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRE3/4
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Empire Rigging & Supply -
Amazon.com -

Features

High Speed Steel
Machine Expansion Reamer
Show More
Top 3

Drill America DWRRHDE2INCH HSS Hand Expansion Reamer, 2"

Drill America
DWRRHDE2INCH
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Hand Reamer
Show More
Top 4

Drill America 1-1/4" High Speed Steel Straight Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRE1-1/4
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Package Dimensions: 6.0 L x 2.0 H x 3.0 W (inches)
Package Weight : 1 pounds
Show More
Top 5

Drill America 9/32" High Speed Steel Straight Flute Hand Expansion Reamer, DWR Series

Drill America
DWRRHDE9/32
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Empire Rigging & Supply -

Features

High Speed Steel
Hand Reamer
Show More
Top 6

KnKut 5/16" - 9/16" Hole Expansion Step Reamer

KnKut
KK4SR-5-16-9-16
1.0 x 1.0 x 1.0 inches
1.0 Pounds

Ratings for KnKut (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Crimp Supply Inc 2,292

Features

Size Range: 5/16" - 9/16"
90° Notch Point starts holes easily
Show More
Top 7

Drill America 1/2" High Speed Steel Straight Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRE1/2
6.0 x 4.0 x 2.0 inches

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Package Dimensions: 6.0 L x 2.0 H x 3.0 W (inches)
Package Weight : 1 pounds
Show More
Top 8

Drill America DWRRHDE7/32 HSS Hand Expansion Reamer, 7/32"

Drill America
DWRRHDE7/32
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Hand Reamer
Show More
Top 9

.6492 (16.5mm-) X .555 X 1-3/8 X 8" OAL 6 Straight Flute RHC HSS Expansion Reamer

Generic

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -

Features

THIS IS A SELLER REFURBISHED .6492 (16.5mm) OD X .555 SHANK X 1-3/8 LENGTH OF CUT X 8" OVER ALL LENGTH 6 STRAIGHT FLUTE RIGHT HAND CUT HSS EXPANSION REAMER
THIS TOOL HAS BEEN REGROUND IN OUR SHOP, TO REMOVE NICKS AND OR DINGS.
Top 10

.4916 X #1 MTS X 1 X 8" OAL 6 Straight Flute RHC HSS Carbide Tipped Expansion Reamer

Generic

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -

Features

THIS IS A SELLER REFURBISHED .4916 OD X #1 MORSE TAPER SHANK X 1" LENGTH OF CUT X 8" OVER ALL LENGTH 6 STRAIGHT FLUTE RIGHT HAND CUT HSS CARBIDE TIPPED EXPANSION REAMER
THIS TOOL HAS BEEN REGROUND IN OUR SHOP, TO REMOVE NICKS AND OR DINGS.
Top 11

Drill America 5/16" High Speed Steel Spiral Flute Hand Expansion Reamer, DWR Series

Drill America
DWRRHDES5/16
6.0 x 4.0 x 2.0 inches

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Hand Reamer
Show More
Top 12

Drill America 3/16" High Speed Steel Straight Flute Hand Expansion Reamer, DWR Series

Drill America
DWRRHDE3/16
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Hand Reamer
Show More
Top 13

1/2" Expansion Reamer, Carbide Tipped, Straight Shank, 56005, USA Made

Super Tool
56005
8.0 x 0.5 x 0.5 inches
0.35 Pounds

Ratings for Super Tool (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Cutting Tool Depot -
Super Tool, Inc. -

Features

When the diameter wears down to the low limit, it may be expanded oversize, reground to size and recleared. The expansion screw should never be loosened in an attempt to use the reamer for a size smaller than that to which the tool was originally finish ground. These reamers are inteded to be used for 1 specific diameter, not multiple diameters.
8" overall length
Show More
Top 14

Drill America 1-3/8" High Speed Steel Spiral Flute Hand Expansion Reamer, DWR Series

Drill America
DWRRHDES1-3/8
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Package Dimensions: 6.0 L x 2.0 H x 3.0 W (inches)
Finish type: Bright
Show More
Top 15

3/8" Expansion Reamer, Carbide Tipped, Straight Shank, 56003, USA Made

Super Tool
56003
7.0 x 0.37 x 0.37 inches
0.16 Pounds

Ratings for Super Tool (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Cutting Tool Depot -
Super Tool, Inc. -

Features

When the diameter wears down to the low limit, it may be expanded oversize, reground to size and recleared. The expansion screw should never be loosened in an attempt to use the reamer for a size smaller than that to which the tool was originally finish ground. These reamers are inteded to be used for 1 specific diameter, not multiple diameters.
7" overall length
Show More
Top 16

.6040 CARBIDE TIPPED EXPANSION REAMER 9/16 SHANK, 1-1/4 LOC, 9 INCH OVERALL

Rock River
0.6875 Pounds

Ratings for Rock River (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -
Top 17

Keystone 1" O.D. HSS Adjustable Expansion Reamer 8 Flute 1.0 1.0000 USA Made - TH1047AJ3

M & J Tooling LLC

Ratings for M & J Tooling LLC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
M & J Tooling LLC -
Top 18

Drill America DWRRETS1-3/4 Taper Shank Machine Expansion Reamer, 1-3/4"

Drill America
DWRRETS1-3/4
0.99 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Machine Expansion Reamer
Show More
Top 19

LOT of HSS Reduced Shank Chucking & Expansion REAMERS Under 1" Straight Flutes - BT3350LVR

M & J Tooling LLC

Ratings for M & J Tooling LLC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
M & J Tooling LLC -
Top 20

Drill America 1-1/2" High Speed Steel Straight Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRE1-1/2
6.0 x 4.0 x 2.0 inches
0.9921 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Machine Expansion Reamer
Show More
Top 21

.4955 X #1 MTS" X 1 X 8" OAL 6 Straight Flute RHC HSS Carbide Tipped Expansion Reamer

Generic

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -

Features

THIS IS A SELLER REFURBISHED .4955 OD X #1 MORSE TAPER SHANK X 1" LENGTH OF CUT X 8" OVER ALL LENGTH 6 STRAIGHT FLUTE RIGHT HAND CUT CARBIDE TIPPED EXPANSION REAMER
THIS TOOL HAS BEEN REGROUND IN OUR SHOP, TO REMOVE NICKS AND OR DINGS.
Top 22

Drill America 3/8" High Speed Steel Taper Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRETS3/8
6.0 x 4.0 x 2.0 inches

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High Speed Steel
Machine Expansion Reamer
Show More
Top 23

.610 X .425 X 1-1/4 X 5-3/8 OAL 6 Straight Flute RHC Expansion Reamer HSS

GENERIC

Ratings for GENERIC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -

Features

THIS IS A SELLER REFURBISHED .610 OD DIAMETER X .425 SHANK DIA X 1-1/4 LENGTH OF CUT X 5-3/8 OVER ALL LENGTH 6 STRAIGHT FLUTE RIGHT HAND CUT EXPANSION REAMER HSS
THIS TOOL HAS BEEN REGROUND IN OUR SHOP FOR NICKS, DINGS OR SIMULAR ISSUES
Top 24

Morse 7/16 O.D. HSS Adjustable Expansion Reamer 6 Flute .4375 ONSIZE 11 mm USA - BR3224AR3

M & J Tooling LLC

Ratings for M & J Tooling LLC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
M & J Tooling LLC -
Top 25

.3940 Carbide Tipped Expansion Reamer

ROCK RIVER TOOL
0.1875 Pounds

Ratings for ROCK RIVER TOOL (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -
Top 26

Drill America 13/16" High Speed Steel Taper Shank Machine Expansion Reamer, DWR Series

Drill America
DWRRETS13/16
6.0 x 4.0 x 2.0 inches
2.0 Pounds

Ratings for Drill America (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
Machine expansion reamer
Show More
Top 27

0.562 OD HSS Adjustable Expansion Reamer 6 FL .562 .5620 .5625 Undersize CNC - EA0260LVR

M & J Tooling LLC

Ratings for M & J Tooling LLC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
M & J Tooling LLC -
Top 28

.9943 X .487 X 1-5/8 X 5-3/4" OAL 8 Straight Flute RHC HSS Expansion Reamer

Generic

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
L&N ENTERPRISES -

Features

THIS IS A SELLER REFURBISHED .9943 OD X .487 SHANK X 1-5/8 LENGTH OF CUT X5-3/4" OVER ALL LENGTH 8 STRAIGHT FLUTE RIGHT HAND CUT HSS CHUCKING REAMER
THIS TOOL HAS BEEN REGROUND IN OUR SHOP, TO REMOVE NICKS AND OR DINGS.

Top 10 Expansion Reamers - Verified to Buy (September 2026)

Top 8 Expansion Reamers Brands on Amazon

Here is the list of top-rated brands that were evaluated by CherryPicks.

  • KnKut
  • Drill America
  • Generic
  • Super Tool
  • Rock River
  • M & J Tooling LLC
  • GENERIC
  • ROCK RIVER TOOL

Top 8 Expansion Reamers Sellers: CPR Seller Rank List

CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.

Rank Name Yearly Feedbacks Avg. Ratings
🥇 Crimp Supply Inc 25,878 4.7
🥈 Empire Rigging & Supply 4,861 4.0
🥉 Tooldom Tools 3,445 4.8
4 Amazon.com 386 4.7
5 Super Tool, Inc. 315 4.7
6 L&N ENTERPRISES 152 4.8
7 M & J Tooling LLC 95 4.7
8 Cutting Tool Depot 25 4.9
View or download top Expansion Reamers seller & rating report
Crimp Supply Inc [25878] Empire Rigging & Supply [4861] Tooldom Tools [3445] Amazon.com [386] Super Tool, Inc. [315] L&N ENTERPRISES [152] M & J Tooling LLC [95] Cutting Tool Depot [25] Crimp Supply Inc 74% Empire Rigging & Supply 14% Tooldom Tools 10% Amazon.com 1% Super Tool, Inc. 1% L&N ENTERPRISES 0% M & J Tooling LLC 0% Cutting Tool Depot 0%

[Get] Expansion Reamers Deals (✅Exclusively for Prime)

What does "Amazon Fulfilled" Mean?

Amazon Fulfilled refers to products handled by Amazon's logistics, which indicates that the product is stored, packed, and shipped by Amazon from one of its fulfillment centers.

When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.

What does "Prime" Mean?

"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are  an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.

Prime members also have access to other benefits, including 2-Day ShippingExclusive Member DealsPrime VideoBuy With PrimeAmazon MusicPrime Gaming, and more.

Shop Prime Expansion Reamers Deals

What does "Free Shipping" Mean?

"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.

Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.


Why Should You Trust Us?

Now hundreds and thousands of Cutting Tools supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Expansion Reamers to buy for new September 2026?

CherryPicks’s Methodology for Evaluating Expansion Reamers

We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Cutting Tools items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.

We collected and analyzed 261 of Expansion Reamers reviews based on our selection criteria. It helped us shortlist the top qualified and rated Expansion Reamers for Cutting Tools, We found that most customers choose Expansion Reamers with an average price of $113.17, and the top brands are Generic, Drill America, Super Tool And KnKut

Then our expert-level editors reviewed all those quality items and selected the top 28 Expansion Reamers for you, We have researched hundreds of sellers and picked the top sellers for Cutting Tools, including Crimp Supply Inc, Empire Rigging & Supply, Tooldom Tools, Amazon.com, Super Tool, Inc., L&N ENTERPRISES, M & J Tooling LLC And Cutting Tool Depot. The KnKut 3 Piece Hole Expansion Step Reamer Set are available for purchase right now, and The seller of #1 rank product has received honest feedback from 2 consumers with an average rating of 5.0.

We've helped a lot of satisfied users get the right Industrial & Scientific product based on their needs, and save lots of time for them to pick Expansion Reamers to buy.


Written By Brandi W. Cortright

Brandi is a woman in tech who loves to write about the electronics and gadgets she has used. On this site, she would be providing you unbiased reviews of electronics as they are released into the market to make you know what to expect before making a purchase.