2 Flute Reamers | McMaster-Carr

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37 Products

Reaming Drill Bits for Taper-Pin Holes

Drill and shape holes for taper pins in a single pass. The cutting edge of these bits also breaks chips into smaller pieces for easier removal to prevent clogging.

High-Speed Steel

Spiral Flute

Round Shank

Wear and heat resistant, these bits are versatile for use on a range of materials.

Round Shank—The most common shank type. These fit in the chuck of drill presses and portable drills.

						Reamer Diameter
For Taper Pin No.	Overall Lg.	Flute Type	Shank Type	No. of Flutes	Flute Lg.	(A)	(B)	Rate of Taper		Each





			Inch
			5/0	2 5/8"	Spiral	Round	2	1 3/8"	0.0950"	0.0664"	1:50	0000000	000000
			4/0	2 7/8"	Spiral	Round	2	1 5/8"	0.1110"	0.0772"	1:50	0000000	00000
			3/0	3 1/8"	Spiral	Round	2	1 7/8"	0.1270"	0.0879"	1:50	0000000	00000
			2/0	3 1/4"	Spiral	Round	2	2"	0.1430"	0.1013"	1:50	0000000	00000
			0	3 3/8"	Spiral	Round	2	2 1/8"	0.1580"	0.1137"	1:50	0000000	00000
			1	3 3/4"	Spiral	Round	2	2 3/8"	0.1740"	0.1245"	1:50	0000000	00000
			2	4 3/8"	Spiral	Round	2	3"	0.1950"	0.1325"	1:50	0000000	00000
			3	4 1/2"	Spiral	Round	2	3"	0.2200"	0.1575"	1:50	0000000	000000
			4	5 1/4"	Spiral	Round	2	3 5/8"	0.2530"	0.1775"	1:50	0000000	00000
			5	6 1/4"	Spiral	Round	2	4 1/2"	0.2920"	0.1983"	1:50	0000000	000000
			6	6 7/8"	Spiral	Round	2	4 7/8"	0.3470"	0.2455"	1:50	0000000	000000
			7	8 1/2"	Spiral	Round	2	6 1/4"	0.4120"	0.2818"	1:50	0000000	000000
			8	9 3/4"	Spiral	Round	2	7"	0.5060"	0.3600"	1:50	0000000	000000
			9	11 3/8"	Spiral	Round	2	8 1/8"	0.6330"	0.4638"	1:50	0000000	000000
			10	12 7/8"	Spiral	Round	2	9 3/8"	0.7600"	0.5647"	1:50	0000000	000000



					Metric
					2	65 mm	Spiral	Round	2	43 mm	2.8 mm	1.9 mm	1:50	0000000	00000
					2.5	89 mm	Spiral	Round	2	56 mm	3.4 mm	2.3 mm	1:50	0000000	00000
					3	98 mm	Spiral	Round	2	66 mm	4.1 mm	2.8 mm	1:50	0000000	00000
					4	119 mm	Spiral	Round	2	81 mm	5.4 mm	3.7 mm	1:50	0000000	00000
					5	138 mm	Spiral	Round	2	97 mm	6.6 mm	4.7 mm	1:50	0000000	00000
					6	179 mm	Spiral	Round	2	129 mm	8.2 mm	5.7 mm	1:50	0000000	00000
					8	211 mm	Spiral	Round	2	154 mm	10.7 mm	7.6 mm	1:50	0000000	000000
					10	246 mm	Spiral	Round	2	175 mm	13.1 mm	9.6 mm	1:50	0000000	000000
					12	275 mm	Spiral	Round	2	198 mm	15.7 mm	11.9 mm	1:50	0000000	000000
					14	310 mm	Spiral	Round	2	210 mm	18.0 mm	13.8 mm	1:50	0000000	000000
					16	335 mm	Spiral	Round	2	230 mm	20.4 mm	15.8 mm	1:50	0000000	000000

Reduced-Shank Hole-Enlarging Drill Bit Sets

An economical alternative to reamers, these sets include four bit sizes for enlarging existing drilled holes. Bits have four flutes that won’t catch on the inside of the hole like standard two-flute bits can, avoiding damage to the hole and your tool. The shank has a smaller diameter than the cutting tip, so you can ream large holes using tools that have small-capacity chucks. Sets also contain four hole-starting bits.

Tool Steel

Spiral Flute

	Container Type		Each
Black Oxide





	Inch
	8	1/4", 5/16", 25/64", and 15/32" Hole-Starting Bits, 3/8", 1/2", 5/8", and 3/4" Hole-Enlarging Bits	Spiral	Metal Case	00000000	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.

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





				Wire Gauge
				0.0135" (80 Ga.)	High-Speed Steel	3/8"	3/4"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	000000
				0.0135" (80 Ga.)	Cobalt Steel	3/8"	3/4"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	00000000	00000
				0.0145" (79 Ga.)	High-Speed Steel	3/8"	3/4"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	00000
				0.0145" (79 Ga.)	Cobalt Steel	3/8"	3/4"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	00000000	00000
				0.0160" (78 Ga.)	High-Speed Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	00000
				0.0160" (78 Ga.)	Cobalt Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	00000000	00000
				0.0180" (77 Ga.)	High-Speed Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	00000
				0.0180" (77 Ga.)	Cobalt Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	00000000	00000
				0.0200" (76 Ga.)	High-Speed Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	00000
				0.0200" (76 Ga.)	Cobalt Steel	3/8"	7/8"	2	0" to 0.0002"	Aluminum, Brass, Bronze, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened Steel	00000000	00000