2.4 mm Reamers | McMaster-Carr

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





				Metric

				2.5 mm	3.4600	2.4000	High-Speed Steel	53	79	3	Left Hand	-0.0254 to 0.0254	1:48	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30025A62	000000

Square Shank

Straight Flute

Turn these reamers by hand with an adjustable wrench, straight-handle tap wrench, or pin vise (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.

						Lg., mm
	For Taper Pin No.	Reamer Dia. (A), mm	Reamer Dia. (B), mm	Material	Square Shank Size, mm	Flute	Overall	No. of Flutes	Cutting Dia. Tolerance, mm	Rate of Taper	For Use On		Each
Straight Flute





				Metric

				2.5 mm	3.3600	2.4000	High-Speed Steel	2.8	48	68	4	0 to 0.075	1:50	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	30165A62	000000

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.

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





				Metric

				2.4000 mm	High-Speed Steel	19.1	76.2	4	0 to 0.005	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	8851A132	000000