Decimal Reamers | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Shank Diameter Shank Diameter

1/16"

	Reach Length Reach Length

	For Taper Pin Number For Taper Pin Number

0
1
3/0
4/0
5/0
7/0
6/0
2/0
2
3
4
5
6
7
8
9
10
11
12
13
14
2 mm
2.5 mm
3 mm
4 mm
5 mm
6 mm
8 mm
10 mm
12 mm
13 mm
16 mm
20 mm

	Application Application

For Taper Pin Holes

For Dowel Pin Holes

For Hole Alignment

For Morse Taper Socket
Holes

For Pipe

	Spiral Direction Spiral Direction

Left Hand

Right Hand

	Rate of Taper Rate of Taper

1/4" per 12"

1 mm per 50 mm

	Cut Direction Cut Direction

Right Hand

Left Hand

	For Dowel Pin Diameter For Dowel Pin Diameter

	Square Shank Size Square Shank Size

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2,586 Products

About Reamers

High-Speed Steel Round-Shank Reamers

These are standard inch‐sized reamers.

Oversized High-Speed Steel Round-Shank Reamers

Create a looser fit than standard reamer sizes.

Undersized High-Speed Steel Round-Shank Reamers

Use these reamers to create a tighter fit than standard reamer sizes.

Wire Gauge Size High-Speed
Steel Round-Shank Reamers

These standard reamers come in wire gauge sizes.

Metric Size High-Speed Steel Round-Shank Reamers

These are standard metric-sized reamers.

Letter Size High-Speed Steel Round-Shank Reamers

These letter size cobalt steel reamers offer good performance on hard-to-machine materials.

Carbide Round-Shank Reamers

These are standard inch‐sized reamers.

Oversized Carbide Round-Shank Reamers

These reamers create looser fit than standard reamer diameters.

Undersized Carbide Round-Shank Reamers

Create a tighter fit than standard reamer diameters.

Metric Size Carbide Round-Shank Reamers

These are standard metric-sized reamers.

Wire Gauge Size Carbide Round-Shank Reamers

These standard reamers come in wire gauge sizes.

Cobalt Steel Round-Shank Reamers

Choose these cobalt steel reamers for good performance on hard-to-machine materials.

Oversized Cobalt Steel Round-Shank Reamers

These reamers have a looser fit than reamers with standard diameters.

Undersized Cobalt Steel Round-Shank Reamers

Choose these reamers to create a tighter fit than standard reamer diameters.

Wire Gauge Cobalt Steel Round-Shank Reamers

Available in wire gauge sizes, these reamers perform well on hard-to-machine materials.

Letter Size Cobalt Steel Round-Shank Reamers

These letter size cobalt steel reamers offer good performance on hard-to-machine materials.

Metric Size Cobalt Steel Round-Shank Reamers

Offering good performance on hard-to-machine materials, these cobalt steel reamers come in metric sizes.

Carbide-Tipped Round-Shank Reamers

More abrasion resistant than cobalt steel and high-speed steel reamers, these maintain a sharper, harder edge at high temperatures for excellent performance on hard and abrasive materials.

Inch Size Hand Reamers

Turn these inch size reamers by hand with a straight-handle tap wrench.

Metric Size Hand Reamers

Turn these metric reamers by hand with a straight-handle tap wrench.

Threaded-Shank Reamers

These reamers have a 1/4”-28 threaded shank.

Morse Taper-Shank Reamers

The tapered shank fits the spindle hole of machine tools with a Morse taper.

Arbor-Mount Reamers

Smooth and expand hole diameters that are 1 ¾" and larger with these reamers.

Expansion Reamers

Expansion Round-Shank Reamers

These reamers are designed for use in drill presses, turret lathes, screw machines, and other machine tools.

Expansion Hand Reamers

Use an adjustable wrench or straight-handle tap wrench to turn these reamers by hand.

Reamers for Hole Alignment

Round-Shank Reamers for Hole
Alignment with Safety Collar

A collar on the shank prevents you from reaming past the cutting edge.

Round-Shank Reamers for Hole Alignment

For use with hand-held electric and air tools, these ream, true, enlarge, align, and deburr holes.

Hex Nut-Shank Reamers for Hole
Alignment with Safety Magnets

Magnets on the hex nut hold the reamer in place in your tool and prevent it from accidentally falling.

Morse Taper-Shank Reamers for Hole Alignment

Use these reamers in stationary machines.

Reamers for Dowel Pins

Carbide Reamers for Dowel Pins

Solid carbide is harder, stronger, and more wear resistant than cobalt steel and high-speed steel for the highest accuracy and longest tool life. These reamers retain a sharp, hard edge at high temperatures for the best performance on hard and abrasive materials.

Cobalt Steel Reamers for Dowel Pins

Better abrasion and heat resistance than high-speed steel for up to 25% faster cutting.

High-Speed Steel Reamers for Dowel Pins

For general purpose applications.

Reamers for Taper-Pin Holes

Inch Size Round-Shank Reamers for Taper-Pin Holes

Use these inch size reamers in drill presses, turret lathes, screw machines, and other machine tools.

Metric Size Round-Shank Reamers for Taper-Pin Holes

Available in metric sizes, these reamers are used in drill presses, turret lathes, screw machines, and other machine tools.

Inch Size Hand Reamers for Taper-Pin Holes

Hand turn these inch size reamers with an adjustable wrench, straight-handle tap wrench, or pin vise to ream existing holes for use with standard taper pins.

Metric Size Hand Reamers for Taper-Pin Holes

Hand turn these metric reamers with an adjustable wrench, straight-handle tap wrench, or pin vise to ream existing holes for use with standard taper pins.

Reamers for Morse Taper-Socket Holes

Turn existing straight drilled holes into Morse taper holes.

Reamers for Taper-Pipe Holes

Use these reamers before tapping with taper-pipe taps.

Reamer Sets

Undersized/Oversized Cobalt Steel
Standard-Length Reamer Sets

More heat and abrasion resistant than high-speed steel, cobalt steel can run up to 25% faster and have a longer tool life.

Metric Size High-Speed Steel Reamer Sets

Use these metric size reamers for general purpose applications.

Undersized/Oversized High-Speed Steel Reamer Sets

These allow for a slightly tighter or looser fit than standard reamer diameters.

Letter Size High-Speed Steel Drill-Length Reamer Sets

Use these letter size reamers for general purpose applications.

Wire Gauge Size High-Speed Steel Reamer Sets

The reamers in these sets come in wire gauge sizes for general purpose applications.

Cobalt Steel Reamer Sets for Dowel Pins

With better heat and abrasion resistance than high-speed steel, cobalt steel can run up to 25% faster and has a longer tool life.

High-Speed Steel Reamer Sets for Dowel Pins

For general purpose applications.

Reamer Sets for Taper-Pin Holes

Ream existing holes for standard taper pins.

About Reamers

Reamers

High-Speed Steel Round-Shank Reamers

Oversized High-Speed Steel Round-Shank Reamers

Undersized High-Speed Steel Round-Shank Reamers

Wire Gauge Size High-SpeedSteel Round-Shank Reamers

Metric Size High-Speed Steel Round-Shank Reamers

Letter Size High-Speed Steel Round-Shank Reamers

Carbide Round-Shank Reamers

Oversized Carbide Round-Shank Reamers

Undersized Carbide Round-Shank Reamers

Metric Size Carbide Round-Shank Reamers

Wire Gauge Size Carbide Round-Shank Reamers

Cobalt Steel Round-Shank Reamers

Oversized Cobalt Steel Round-Shank Reamers

Undersized Cobalt Steel Round-Shank Reamers

Wire Gauge Cobalt Steel Round-Shank Reamers

Letter Size Cobalt Steel Round-Shank Reamers

Metric Size Cobalt Steel Round-Shank Reamers

Carbide-Tipped Round-Shank Reamers

Inch Size Hand Reamers

Metric Size Hand Reamers

Threaded-Shank Reamers

Morse Taper-Shank Reamers

Arbor-Mount Reamers

Expansion Reamers

Expansion Round-Shank Reamers

Expansion Hand Reamers

Reamers for Hole Alignment

Round-Shank Reamers for HoleAlignment with Safety Collar

Round-Shank Reamers for Hole Alignment

Hex Nut-Shank Reamers for HoleAlignment with Safety Magnets

Morse Taper-Shank Reamers for Hole Alignment

Reamers for Dowel Pins

Carbide Reamers for Dowel Pins

Cobalt Steel Reamers for Dowel Pins

High-Speed Steel Reamers for Dowel Pins

Reamers for Taper-Pin Holes

Inch Size Round-Shank Reamers for Taper-Pin Holes

Metric Size Round-Shank Reamers for Taper-Pin Holes

Inch Size Hand Reamers for Taper-Pin Holes

Metric Size Hand Reamers for Taper-Pin Holes

Reamers for Morse Taper-Socket Holes

Reamers for Morse Taper-Socket Holes

Reamers for Taper-Pipe Holes

Reamers for Taper-Pipe Holes

Reamer Sets

Undersized/Oversized Cobalt SteelStandard-Length Reamer Sets

Metric Size High-Speed Steel Reamer Sets

Undersized/Oversized High-Speed Steel Reamer Sets

Letter Size High-Speed Steel Drill-Length Reamer Sets

Wire Gauge Size High-Speed Steel Reamer Sets

Cobalt Steel Reamer Sets for Dowel Pins

High-Speed Steel Reamer Sets for Dowel Pins

Reamer Sets for Taper-Pin Holes

Wire Gauge Size High-Speed
Steel Round-Shank Reamers

Round-Shank Reamers for Hole
Alignment with Safety Collar

Hex Nut-Shank Reamers for Hole
Alignment with Safety Magnets

Undersized/Oversized Cobalt Steel
Standard-Length Reamer Sets