0.2500" Reamers | McMaster-Carr

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

Spiral Flute—Since these reamers clear chips better than straight flutes, they leave holes with a smoother finish. They're better for holes with breaks in the surface, such as a keyway, because they cut continuously across the breaks instead of moving in and out.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Titanium Nitride (TiN)-Coated High-Speed Steel—Coated to create less friction than uncoated high-speed steel reamers, these run faster and last twice as long.

Cobalt Steel—With better heat and wear resistance than high-speed steel, these reamers run up to 25% faster, last longer, and perform better on hard materials, such as cast iron, hardened steel, titanium, and stainless steel.

Carbide—For the highest level of accuracy when cutting hard materials, these are our hardest, strongest, and most wear-resistant reamers. They're used on materials such as iron, hardened steel, steel alloys, and plastic. Their hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the reamer from breaking.

Carbide-Tipped Tool Steel—Since these reamers retain a sharper, harder edge at higher temperatures than high-speed steel and cobalt steel, they can be used on hard materials, such as iron, hardened steel, and steel alloys. They aren't as brittle as solid carbide reamers, so they can be used in less rigid setups, such as a hand-held drill.

Right-Hand Spiral—These reamers pull chips upward as they cut, so they're often used in blind holes.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

			Lg.
	Reamer Dia.	Material	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	For Use On	Mfr.		Each
Straight Flute







				Inch

				0.2500" (1/4")	High-Speed Steel	1 1/2"	6"	6	—	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	2995A65	000000


				0.2500" (1/4")	Cobalt Steel	1 1/2"	6"	6	—	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	Yankee	2975A24	00000
				0.2500" (1/4")	Carbide	1"	3"	4	—	0" to 0.0002"	Aluminum, Brass, Bronze, Fiberglass, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	Morse Cutting Tools	3026A27	00000
				0.2500" (1/4")	Carbide-Tipped Tool Steel	1 1/2"	6"	4	—	0" to 0.0003"	Aluminum, Brass, Bronze, Fiberglass, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	Rock River Tool	3025A15	00000




						Letter Size

						0.2500" (E)	High-Speed Steel	1 1/2"	6"	6	—	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	89485A45	00000


						0.2500" (E)	Cobalt Steel	1 1/2"	6"	6	—	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	Alvord-Polk Tool	26885A45	00000


						Spiral Flute







										Inch

										0.2500" (1/4")	High-Speed Steel	1 1/2"	6"	6	Right Hand	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3106A24	00000


										0.2500" (1/4")	High-Speed Steel	1 1/2"	6"	6	Left Hand	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3106A74	00000
										0.2500" (1/4")	Titanium Nitride (TiN)-Coated High-Speed Steel	1 1/2"	6"	6	Right Hand	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	28435A166	00000

Square Shank

Straight Flute

Spiral Flute

Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

				Lg.
	Reamer Dia.	Material	Square Shank Size	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	For Use On	Mfr.		Each
Straight Flute







				Inch

				0.2500" (1/4")	High-Speed Steel	0.185"	2"	4"	6	—	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	2989A15	000000


				Spiral Flute







								Inch

								0.2500" (1/4")	High-Speed Steel	0.185"	2"	4"	6	Left Hand	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	2989A51	00000

Expandable Flutes, Square Shank


Straight Flute	Spiral Flute

Unlike standard reamers, which are unusable once they become worn, these can be returned to their original size for finishing holes. After the reamer is worn down, tighten the set screw to expand the diameter, grind the reamer to its original size, and get back to work.

These are not designed for producing holes larger than the listed diameter or for producing holes of various sizes. The set screw should not be loosened.

Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

	Reamers													Optional Straight-Handle Tap Wrenches
				Lg.
	Reamer Dia.	Material	Square Shank Size	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	Recommended Expansion Limit	For Use On	Mfr.		Each		Each
Straight Flute







				Inch

				0.2500" (1/4")	High-Speed Steel	0.185"	1 7/16"	3 7/8"	6	—	-0.0005" to 0"	0.010"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Republic Drill	2993A56	000000	2546A15	0000000


				Spiral Flute







								Inch

								0.2500" (1/4")	High-Speed Steel	0.185"	1 7/16"	3 7/8"	6	Left Hand	-0.0005" to 0"	0.010"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Republic Drill	2993A79	00000	2546A15	000000

Threaded Shank

Straight Flute

These reamers fit power drills that have a _1/4"-28 threaded spindle or adapter. Using a powered hand tool can affect alignment, so these have a built-in pilot that guides the reamer into the hole and keeps it straight.

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

				Lg.
	Reamer Dia.	Pilot Dia.	Material	Flute	Pilot	Overall	No. of Flutes	Cutting Dia. Tolerance	Pilot Cutting Dia. Tolerance	For Use On	Mfr.		Each
Straight Flute







				Inch

				0.2500" (1/4")	0.240"	High-Speed Steel	1 1/2"	1/2"	2 1/8"	6	0" to 0.0002"	-0.001" to 0"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	2585A33	000000

Reamer Sets

Keep a variety of reamer sizes on hand for finishing holes.

Round Shank

These reamers fit in the chuck of drill presses, turret lathes, and other machine and power tools, making them the most common shank type.

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Right-Hand Spiral—These reamers pull chips upward as they cut, so they're often used in blind holes.

Jobbers' Length—The same length as jobbers' drill bits, these reamers save setup time when you want to drill and ream on the same machine, such as a drill press or bench lathe.

	Spiral Direction	Lg. Class	Container Type	For Use On	Mfr.		Each
Straight Flute







	Inch

	1/16"-1/4" (Increments of 1/64")	13	High-Speed Steel	—	Jobbers	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A1	0000000


	1/16"-1/2" (Increments of 1/64")	29	High-Speed Steel	—	—	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A17	000000
	1/16"-1/2" (Increments of 1/64")	29	High-Speed Steel	—	—	Wood Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A8	000000
	1/16"-1/2" (Increments of 1/64")	29	High-Speed Steel	—	Jobbers	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A2	000000
	1/16"-1/2" (Increments of 1/32")	15	High-Speed Steel	—	—	Roll-Up Pouch	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A24	000000




			Letter Size

			A-Z	26	High-Speed Steel	—	Jobbers	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A3	000000


			Spiral Flute







							Inch

							1/16"-1/2" (Increments of 1/64")	29	High-Speed Steel	Right Hand	—	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A9	000000


							1/16"-1/2" (Increments of 1/32")	15	High-Speed Steel	Right Hand	Jobbers	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Yankee	3008A34	000000

Reamers for Hole Alignment

Enlarge holes to correct misalignment and overlap. Misaligned holes often have a narrow entry, so the tapered shape is easier to insert and makes more contact to remove the overlapping material. These are also known as bridge and car reamers.

Round Shank


Spiral Flute	Spiral Flute Depth Limiting

These reamers fit in the chuck of drill presses, turret lathes, and other machine and power tools, making them the most common shank type.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

Depth Limiting—A collar on the shank prevents these reamers from going too deep into material, protecting your tool's chuck from damage.

				Lg.
	Reamer Dia. (A)	Reamer Dia. (B)	Material	Flute	Overall	Spiral Direction	Cutting Dia. Tolerance	Performance	For Use On	Mfr.		Each
Spiral Flute







				Inch

				0.2500" (1/4")	0.1250"	High-Speed Steel	1 7/8"	4"	Left Hand	0" to 0.005"	Depth Limiting	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	2743A53	000000


				0.2500" (1/4")	0.1563"	High-Speed Steel	2 1/4"	4 3/8"	Left Hand	0" to 0.01"	—	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Drillco	3089A11	00000
				0.3750" (3/8")	0.2500"	High-Speed Steel	2 1/2"	4 5/8"	Left Hand	0" to 0.01"	—	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Drillco	3089A13	00000
				0.4375" (7/16")	0.2500"	High-Speed Steel	3 1/4"	5 3/8"	Left Hand	0" to 0.01"	—	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Drillco	3089A14	00000
				0.6250" (5/8")	0.2500"	High-Speed Steel	4 7/16"	6 9/16"	Left Hand	0" to 0.005"	Depth Limiting	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	2743A14	00000

Morse Taper Shank

Spiral Flute

These reamers work with machine tools that have a Morse taper-spindle hole, such as a drill press or lathe.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

					Lg.
	Reamer Dia. (A)	Reamer Dia. (B)	Material	Machine Taper No.	Flute	Overall	Spiral Direction	Cutting Dia. Tolerance	For Use On	Mfr.		Each
Spiral Flute







				Inch

				0.4375" (7/16")	0.2500"	High-Speed Steel	Morse 2	4 3/8"	8 1/4"	Left Hand	0" to 0.01"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Drillco	2992A17	0000000

Reamers for Deburring

Smooth the inside and edges of holes with these reamers. Often used to finish holes in sheet metal or to remove burrs from the ends of cut pipe and conduit, they're also known as repairmen's reamers.

Round Shank

Spiral Flute

These reamers fit in the chuck of drill presses, turret lathes, and other machine and power tools, making them the most common shank type.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

				Lg.
	For Pipe Size	Reamer Dia. (B to A)	Material	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	For Deburring	For Use On	Mfr.		Each
Spiral Flute







				Inch

				1/4 to 1 1/4	0.2500" to 1.4688" (1/4" to 1 15/32")	High-Speed Steel	3"	5"	10	Left Hand	-0.003" to 0.003"	Inner Pipe Edges, Inner Tube Edges, Inner Conduit Edges, Sheet Edges	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	3017A12	0000000


				1/4 to 2	0.2500" to 2.2656" (1/4" to 2 17/64")	High-Speed Steel	3 7/8"	5 7/8"	12	Left Hand	-0.003" to 0.003"	Inner Pipe Edges, Inner Tube Edges, Inner Conduit Edges, Sheet Edges	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	3017A13	000000

T-Handle Shank

Spiral Flute

No additional tools required, these reamers have an integrated handle that's easy to grip and turn.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

				Lg.
	For Pipe Size	Reamer Dia. (B to A)	Material	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	For Deburring	For Use On	Mfr.		Each
Spiral Flute







				Inch

				1/4 to 2	0.2500" to 2.2656" (1/4" to 2 17/64")	High-Speed Steel	3 7/8"	5 7/8"	12	Left Hand	-0.003" to 0.003"	Inner Pipe Edges, Inner Tube Edges, Inner Conduit Edges, Sheet Edges	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Alvord-Polk Tool	3017A18	0000000

L-Handle Shank

Straight Flute

Turn these reamers with the long ratcheting handle, which provides more leverage than a T-handle.

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

Hardened Steel—Typically more economical but less durable than high-speed steel, these are for general purpose reaming.

				Lg.
	For Pipe Size	Reamer Dia. (B to A)	Material	Flute	Reamer Handle	Ratcheting Handle	No. of Flutes	For Deburring	For Use On	Mfr.		Each
Straight Flute







				Inch

				1/8 to 2	0.2500" to 2.2500" (1/4" to 2 1/4")	Hardened Steel	6 3/8"	6 5/8"	16"	5	Inner Pipe Edges, Inner Tube Edges, Inner Conduit Edges	Aluminum, Brass, Bronze, Copper, Iron, Plastic, Stainless Steel, Steel	Greenlee	3678N12	0000000

Round-Shank Reamer Drill Bits

Drill and finish holes in a single pass with these dual-purpose tools. The tapered tip gradually pierces your material to reduce friction, and the straight flutes make clean cuts without chipping or peeling the edge of the hole. Made from solid carbide, these reamer drill bits are strong and heat resistant. The flutes stay sharp even when cutting abrasive materials such as carbon fiber, fiberglass, and graphite. Use them in drill presses or other machines—carbide is brittle, and will break if used to drill by hand.

		Dia.			Lg.
	Reamer Size	Reamer	Shank	Max. Drilling Dp.	Flute	Overall	No. of Flutes	Flute Type	Cutting Dia. Tolerance	For Use On	Mfr.		Each
Carbide







				Inch

				1/4"	0.2500"	1/4"	2.13"	2.125"	4"	4	Straight	0" to 0.0005"	Carbon Fiber, Fiberglass, Graphite	OSG USA	3436N24	0000000

Reamers for Morse Taper-Socket Holes

Use these reamers to turn straight holes into Morse taper-socket holes that can hold cutting tools or adapters in machine spindles. They're also good for finishing existing Morse taper holes and removing nicks and burrs from spindles.

Square Shank

Straight Flute

Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).

Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

	Reamers													Optional Straight-Handle Tap Wrenches
						Lg.
	For Machine Taper No.	Reamer Dia. (A)	Reamer Dia. (B)	Material	Square Shank Size	Flute	Overall	No. of Flutes	Cutting Dia. Tolerance	For Use On	Mfr.		Each		Each
Straight Flute







				Inch

				Morse 0	0.3670"	0.2500"	High-Speed Steel	0.2350"	2 1/4"	3 3/4"	6	-0.0005" to 0.0005"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	F&D Tool	2996A11	000000	2546A13	000000