2 1/4" Drill Bits | McMaster-Carr

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.

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





	Standard Point

	2 1/4"	2.25"	15 1/2"	13"	2 1/4"	1 1/4"-7	2"	2872A34	0000000

Fast-Cutting Smooth-Finish Drill Bits for Wood


Round Shank Standard Point	Quick-Change Hex Shank Screw Point

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.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

	Max. Drilling Dp.	Shank Size	Drill Bit Point Type		Each
Black Oxide





	Quick-Change Hex Shank

	2 1/4"	2.25"	5 1/8"	—	7/16"	Screw	3188A19	000000


	Uncoated





					Round Shank

					2 1/4"	2.25"	6"	4"	1/2"	Standard	2890A39	00000

Carbide-Insert Drill Bits

Shown with Carbide Inserts

(Sold Separately)

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. Also known as indexable drill bits.

Each drill bit requires two inserts—one on the inner cutting edge and one on the outer cutting edge. Replacement inserts are sold separately.

Drill Bits											Drill Bit Inserts			Replacement Insert Screws
				Shank			For Insert
Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Inner Inscribed Circle Dia.	Outer Inscribed Circle Dia.		Each	Pkg. Qty.		Pkg.		Each



	2 1/4"	2.25"	11 1/4"	6 3/4"	Round	1 1/2"	Carbide Insert	0.705"	0.732"	2769N39	000000000	10	2776N786	0000000	2780N16	00000

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

										Each		Package
	For Drill Bit Size	For Mfr.	For Mfr. Series	IC Dia.	Thk.	Hole Dia.	Tip Radius	For Use On	Features		Each	Pkg. Qty.		Pkg.
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	2776N28	000000	10	2776N786	0000000

Outer

										Each		Package
	For Drill Bit Size	For Mfr.	For Mfr. Series	IC Dia.	Thk.	Hole Dia.	Tip Radius	For Use On	Features		Each	Pkg. Qty.		Pkg.
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	2776N29	000000	10	2776N945	0000000