Spiral Helix Reamers | McMaster-Carr

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EAR99

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Hex Shank Size

44 Products

Reamer Type

For Hole Alignment

Enlarge holes to correct misalignment and overlap

13 products

For Taper-Pin Holes

Shape holes to match the profile of taper pins

31 products

Shank Type

Round

Fit in the chuck of most machine and power tools

31 products

Hex

Often used with an impact wrench to ream a hole before installing a fastener

13 products

Reamers for Taper-Pin Holes

Shape holes to match the profile of taper pins. After drilling a hole that matches the size of the small end of the taper pin you want to install, use these reamers to taper and finish the hole.

Round Shank

Helix 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.

Helix Flute—Prevent clogging when removing excess material with helix flutes. They also leave a smoother finish than straight flutes.

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 Taper Pin No.	Reamer Dia. (A)	Reamer Dia. (B)	Material	Flute	Overall	No. of Flutes	Spiral Direction	Cutting Dia. Tolerance	Rate of Taper	For Use On		Each
Helix Flute







				Inch

				7/0	0.0666"	0.0497"	High-Speed Steel	13/16"	1 13/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A11	000000


				6/0	0.0806"	0.0611"	High-Speed Steel	15/16"	1 15/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A12	00000
				5/0	0.0966"	0.0719"	High-Speed Steel	1 3/16"	2 3/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A13	00000
				4/0	0.1142"	0.0869"	High-Speed Steel	1 5/16"	2 5/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A14	00000
				3/0	0.1302"	0.1029"	High-Speed Steel	1 5/16"	2 5/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A15	00000
				2/0	0.1462"	0.1137"	High-Speed Steel	1 9/16"	2 9/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A16	00000
				0	0.1638"	0.1287"	High-Speed Steel	1 11/16"	2 15/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A17	00000
				1	0.1798"	0.1447"	High-Speed Steel	1 11/16"	2 15/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A18	00000
				2	0.2008"	0.1605"	High-Speed Steel	1 15/16"	3 3/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A19	00000
				3	0.2294"	0.1813"	High-Speed Steel	2 5/16"	3 11/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A21	00000
				4	0.2604"	0.2071"	High-Speed Steel	2 9/16"	4 1/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A22	00000


				5	0.2994"	0.2409"	High-Speed Steel	2 13/16"	4 5/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A23	00000
				6	0.3540"	0.2773"	High-Speed Steel	3 11/16"	5 7/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A24	000000
				7	0.4220"	0.3297"	High-Speed Steel	4 7/16"	6 5/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A25	000000
				8	0.5050"	0.3971"	High-Speed Steel	5 3/16"	7 3/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A26	000000
				9	0.6066"	0.4805"	High-Speed Steel	6 1/16"	8 5/16"	3	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A27	000000
				10	0.7216"	0.5799"	High-Speed Steel	6 13/16"	9 5/16"	4	Left Hand	-0.001" to 0.001"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A28	000000
				11	0.8780"	0.7060"	High-Speed Steel	8 1/4"	11 1/4"	4	Left Hand	0" to 0.5"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A29	000000
				12	1.0500"	0.8420"	High-Speed Steel	10"	13 7/8"	4	Left Hand	0" to 0.5"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A31	000000
				13	1.2590"	1.0090"	High-Speed Steel	12"	16"	6	Left Hand	0" to 0.5"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A32	000000
				14	1.5420"	1.2500"	High-Speed Steel	14"	18 1/4"	6	Left Hand	0" to 0.5"	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	2991A33	00000000




						Metric

						2 mm	2.8600 mm	1.9000 mm	High-Speed Steel	48 mm	73 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A61	00000


						2.5 mm	3.4600 mm	2.4000 mm	High-Speed Steel	53 mm	79 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A62	00000
						3 mm	4.1600 mm	2.9000 mm	High-Speed Steel	63 mm	88 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A63	00000
						4 mm	5.4000 mm	3.9000 mm	High-Speed Steel	75 mm	100 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A64	00000
						5 mm	6.6400 mm	4.9000 mm	High-Speed Steel	87 mm	115 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A65	00000
						6 mm	8.2800 mm	5.9000 mm	High-Speed Steel	119 mm	150 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A66	00000
						8 mm	10.7200 mm	7.9000 mm	High-Speed Steel	141 mm	177 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A67	00000
						10 mm	13.1600 mm	9.9000 mm	High-Speed Steel	163 mm	205 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A68	000000
						12 mm	15.7400 mm	11.8600 mm	High-Speed Steel	194 mm	240 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A69	000000
						13 mm	16.7400 mm	12.8000 mm	High-Speed Steel	194 mm	240 mm	3	Left Hand	-0.0254 mm to 0.0254 mm	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A71	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.

Hex Shank

Helix Flute

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

Helix Flute—Prevent clogging when removing excess material with helix flutes. They also leave a smoother finish than straight flutes.

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
Helix Flute







				Inch

				0.8125" (13/16")	0.4688"	High-Speed Steel	1 1/4"	5"	7"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A68	0000000


				0.9375" (15/16")	0.5938"	High-Speed Steel	1 7/16"	5"	7"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A72	000000
				1.0625" (1 1/16")	0.8125"	High-Speed Steel	1 5/8"	5"	7"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A76	000000
				1.1250" (1 1/8")	0.8594"	High-Speed Steel	1 5/8"	5"	7"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A78	000000
				2.0000" (2")	1.7500"	High-Speed Steel	2"	7 3/8"	11 1/2"	Left Hand	0" to 0.01"	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A102	000000




						Metric

						16.0000 mm	7.9000 mm	High-Speed Steel	24 mm	114 mm	152 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A213	00000


						18.0000 mm	10.0000 mm	High-Speed Steel	24 mm	114 mm	165 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A214	00000
						20.0000 mm	11.9000 mm	High-Speed Steel	32 mm	114 mm	178 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A215	00000
						22.0000 mm	13.9000 mm	High-Speed Steel	36 mm	127 mm	178 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A216	000000
						28.0000 mm	21.5000 mm	High-Speed Steel	41 mm	127 mm	178 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A219	000000
						32.0000 mm	25.0000 mm	High-Speed Steel	46 mm	127 mm	178 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A222	000000
						36.0000 mm	30.0000 mm	High-Speed Steel	46 mm	127 mm	200 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A224	000000
						39.0000 mm	33.5000 mm	High-Speed Steel	50 mm	127 mm	200 mm	Left Hand	0 mm to 0.254 mm	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	3239A225	000000