2 1/2" Drill Bits | McMaster-Carr

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18 Products

Carbide-Insert Drill Bits

When you need to drill dozens or even hundreds of holes, use a bit with replaceable carbide inserts. Once the cutting edges wear down, just change the inserts instead of sharpening or throwing the bit away. The holes in the bit channel coolant through the tool for more efficient chip evacuation. Each drill bit requires two inserts—one on the inner cutting edge and one on the outer cutting edge. Replacement inserts are sold separately.

Steel


Spiral Flute Round Shank	Inner Drill Bit Inserts	Outer Drill Bit Inserts

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

					Shank				For Insert				Inner Drill Bit Inserts		Outer Drill Bit Inserts		Replacement Screws
Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type	No. of Flutes	Inner Inscribed Circle Dia.	Outer Inscribed Circle Dia.		Each		Each		Each		Each





			Inch
			2 1/2"	2.5"	12 1/4"	7 1/2"	Spiral	Round	1 1/2"	Carbide Insert	2	0.705"	0.732"	0000000	000000000	0000000	000000	0000000	000000	0000000	00000

Core Drill Bits for Masonry and Concrete

Remove a core of material with these hollow bits to make larger holes than fluted masonry bits. They're often used for installing pipe and conduit through brick and concrete. The carbide tip resists wear and heat to stay sharp.

Hex Shank for Rotary Only Drilling

The hex shape reduces the chance of the shank slipping in the chuck. Pair these bits with hand-held power drills and hammer drills set to rotary-only mode. Because they use rotary action only, they require more pressure to grind up material than other bits.

Pilot Drills—Cut a groove before drilling to make starting the hole easier.

									Pilot Drills
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Shank Size	Specs. Met		Each		Each
Uncoated Carbide-Tipped Steel


		2 1/2"	2.5"	12"	10"	1/2"	ANSI B212.15	0000000	0000000	0000000	000000

Changeable-Size Core Drill Bits for Masonry and Concrete

Instead of investing in multiple bits, change the bit body to drill a different-sized hole. These hollow bits remove a large core of material from concrete, brick, and masonry for installing pipe and conduit. The carbide tip resists wear and heat to stay sharp. Bits include a pilot drill to make starting holes easier.

SDS-Max Shank for Hammer and Rotary Drilling

SDS-Max

Shank

The slotted shank is compatible with SDS-Max-drive rotary hammers. These bits use simultaneous rotary and hammering action to penetrate material. Also known as percussion or impact bits.

Standard Point—The most common point type handles most jobs. However, for more aggressive cutting that generates a lot of heat, consider a multipoint or serrated bit.

	Max. Drilling Dp.	Specs. Met	Includes		Each
Uncoated Carbide-Tipped Steel





	Standard Point
	2 1/2"	2.5"	17"	12"	ANSI B212.15	Pilot Drill	00000000	0000000

Spline Shank for Hammer and Rotary Drilling

Spline

Shank

The shank has 12 splines for use with a spline-drive rotary hammer, which rotate and hammers bits simultaneously to penetrate material. Also known as percussion or impact bits.

Standard Point—The most common point type handles most jobs. However, for more aggressive cutting that generates a lot of heat, consider a multipoint or serrated bit.

	Max. Drilling Dp.	Specs. Met	Includes		Each
Uncoated Carbide-Tipped Steel





	Standard Point
	2 1/2"	2.5"	17"	12"	ANSI B212.15	Pilot Drill	00000000	0000000

Rebar Cutting Core Drill Bits for Concrete

Core out large holes in concrete, even if it's reinforced with rebar mesh. No need to switch bits, these have a diamond-coated edge that keeps on cutting and resists wear to stay sharp.

Threaded-Hub Shank for Rotary Only Drilling

Bits are designed for wet drilling on a drilling rig. To avoid damage to bits and tools, do not use for dry drilling or with portable drills or grinders.

Standard Point—The most common point type handles most jobs.

	Max. Drilling Dp.	Shank Size	Thread Size	Bit ID		Each
Diamond-Coated Steel





	Standard Point
	2 1/2"	2.5"	15 1/2"	13"	2 1/2"	1 1/4"-7	2 1/4"	0000000	0000000

Fast-Cutting Smooth-Finish Drill Bits for Wood

Round Shank

Not only do these bits bore holes faster than standard smooth-finish bits, they create less friction and heat buildup to last longer. The spurred teeth have a long life, but they're less effective at guiding the bit so cuts on angled and overlapping holes tend to be rougher. Also known as multispur bits.

Round Shank—Fit in the chuck of drill presses and portable drills.

	Max. Drilling Dp.	Shank Size	Drill Bit Point Type		Each
Uncoated Steel





	Round Shank
	2 1/2"	2.5"	6"	4"	1/2"	Standard	0000000	000000

Inserts for Carbide-Insert Drill Bits

Pair an inner and outer insert with a compatible drill bit body (sold separately) to drill a large number of holes with high precision. When the cutting edges dull, replace the carbide inserts instead of the entire bit.

Inner

	For Mfr.	For Mfr. Series	IC Dia.	Thk.	Hole Dia.	Tip Radius	For Use On	Features		Each
Titanium Aluminum Nitride (TiAlN)-Coated Carbide


	2 1/4", 2 1/2"	Sandvik Coromant	CoroDrill 880	0.705"	7/32"	3/16"	1/32"	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic	Chip Breakers	0000000	000000

Outer

	For Mfr.	For Mfr. Series	IC Dia.	Thk.	Hole Dia.	Tip Radius	For Use On	Features		Each
Titanium Nitride (TiN)-Coated Carbide


	2 1/4", 2 1/2"	Sandvik Coromant	CoroDrill 880	0.732"	7/32"	3/16"	3/64"	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Plastic	Chip Breakers	0000000	000000