0.2810" 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.

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

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.

	Lg. Class	Container Type	For Use On		Each
Straight Flute







	Letter Size

	A-Z	26	High-Speed Steel	Jobbers	Metal Case	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3008A3	0000000

Reamers

Finish holes to precise inch, metric, wire gauge, or letter sizes with these reamers.

Round Shank

Straight 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.

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.

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.

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







				Inch

				0.2810"	Carbide	1 1/8"	3 3/4"	6	0" to 0.0002"	Aluminum, Brass, Bronze, Fiberglass, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	8307A581	000000




						Letter Size

						0.2810" (K)	High-Speed Steel	1 1/2"	6"	6	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	89485A52	00000


						0.2810" (K)	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	26885A52	00000

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.

Hex Shank

Spiral Flute

The shank fits hex impact sockets, so you can use an impact wrench to both ream the hole and install a fastener.

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.

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

Strong Hold—Magnets on the shank’s end keep these reamers from accidentally falling out of your tool.

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







				Inch

				0.5000" (1/2")	0.2810"	High-Speed Steel	1 1/16"	4"	5 1/2"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A103	0000000