2 3/4" Wrenches | McMaster-Carr

Your go-to wrenches for routine maintenance. With two different ends, you need fewer tools to tighten and loosen nuts and bolts. The open end slides onto the side of fasteners for adjustments in tight spots. When nuts and bolts won't budge, the box end fully encircles them to apply maximum torque. Drop forged for added strength, these wrenches will be part of your toolbox for life.

12-Point Opening—The most common opening, these wrenches work on hex and 12-point nuts and bolts. They slide onto hex heads at more angles than 6-point fasteners for quicker engagement, but they're more likely to slip when you apply more torque.

Chrome-Plated Steel—The most popular finish, these wrenches won't rust or chip. Although they withstand moisture better than black oxide, they don't hold up to harsh chemicals as well as stainless steel.

Black-Oxide Steel—The dark, matte coating protects these wrenches from wear and won't flake off. They offer minimal corrosion resistance, though, so they're best for dry environments.

Dull—With a textured finish, these wrenches won't slip out of your hands, even when greasy or oily.

			Box End		Open End
	Drive Size	Overall Lg.	Head Offset Angle	Head Thick.	Opening Angle	Head Thick.	Appearance		Each
12-Point Opening







				Chrome-Plated Steel

				2 3/4"	30"	15°	1 11/16"	15°	1"	Dull	5441A97	0000000




						Black-Oxide Steel

						2 3/4"	32"	15°	1 5/8"	15°	1 7/32"	Dull	7242A58	000000

Strikable Open-End Wrenches

Round

Opening

Don't wrestle with stuck fasteners. Strike the handle with a hammer to break them free. Designed to take the hits, these wrenches are drop forged for added strength and will be part of your toolbox for life. Also known as slugging wrenches.

Round Opening—The rounded edges spread force evenly to prevent stripping your fasteners. Use them on hex-head fasteners.

Steel—Best for dry environments since moisture will cause these wrenches to rust.

	Head Thk.	Specs. Met		Each
Round Opening







	Steel

	2 3/4"	14 3/4"	15°	1 3/16"	DIN 133	55555A56	0000000

Deep-Offset High-Leverage Box Wrenches

A 45° offset head provides clearance for reaching over obstructions. These wrenches have a long handle for extra leverage—add an extension to increase it even more.

Extension Handles—Extension handles (sold separately) fit securely over the end of the wrench.

	Box Wrenches								Extension Handles
	Drive Size	Overall Lg.	Head Offset Angle	Overall Lg. with Extension Handle	Head Thk.	Material		Each		Each
12-Point Opening



		2 3/4", 70 mm	14"	45°	44"	1 19/32"	Black-Oxide Steel	54555A43	0000000	54555A82	0000000

Wheel Bearing Locknut Socket Sets

Shaped and sized for compatibility with wheel bearing locknuts on trucks and trailers, the sockets in these sets make it easy to install and remove locknuts. They ensure the proper torque setting when you reinstall a locknut on your wheel, so you know it's safe and secure. These are square drive sockets for use with hand-driven tools, not impact wrenches. Made of steel, they grip locknuts tightly and prevent rounding.

Sockets—Chrome-Plated Steel

Plastic Case

4-Pin

6-Pin

6-Point

Rounded

Spindle Puller Adapter—Spindle puller adapters remove the front spindle on four-wheel drive trucks so you can access the needle bearing when lubricating and aligning the front wheels.

6-Point Rounded: 2 3/8", 2 1/2", 2 9/16", 2 3/4"—6-point rounded sockets fit the special rounded hex nuts found on some trucks.

Plastic Case—Carry sets with a plastic case from one location to the next.

4-Pin Socket and 6-Pin Socket—4-pin and 6-pin sockets fit around retaining locknuts with slots or holes in the side. Also known as spanner sockets, they’re similar to tri-groove sockets but have four or six pins instead of three.

6-Point Socket—6-point sockets are designed for use with hex locknuts.

	Components Included	Includes	Container Type	Socket Shape	Drive Size		Each
1/2" Square Drive



	6	1 Adapter 5 Sockets	4-Pin: 2", 2 1/4", 2 3/4" 6-Pin: 2 1/4" Spindle Puller Adapter	Plastic Case	4-Pin, 6-Pin	2", 2 1/4", 2 5/16", 2 3/4"	99939A120	0000000


	7	7 Sockets	6-Point: 2 3/8", 2 1/2", 55 mm 6-Point Rounded: 2 3/8", 2 1/2", 2 9/16", 2 3/4",	Plastic Case	6-Point	2 3/8", 2 1/2", 2 9/16", 2 3/4", 55 mm	99939A140	000000

Deep-Offset Striking Box Wrenches

The head is offset 45° to provide clearance for reaching over obstructions. Also known as slugging wrenches, strike the handle with a hammer to break stuck fasteners free.

	Overall Lg.	Head Offset Angle	Head Thk.	Material	Specs. Met		Each
12-Point Opening



	2 3/4"	15"	45°	1 5/8"	Black-Oxide Steel	ASME B107.100	5455A28	0000000

Backup Wrenches


	Head and Handle Sold Separately

When you’re working with high torque, these wrenches keep the nut from turning as you tighten a bolt. You'll need a head and a handle to form a complete wrench. The head goes around the nut you want to hold stationary and the handle braces against an adjacent nut, absorbing the torque. They're often used when sealing large pipe flanges with a hydraulic torque wrench. Safer than striking wrenches, they stay securely on the nut until you release them.

Heads

	Overall Lg.	Head Thk.	Material		Each
12-Point Opening



	2 3/4"	6"	1"	Black-Oxide Steel	9586N114	0000000

6-Point Impact Sockets

Achieve the best possible grip on hex fasteners and prevent rounding. These sockets are made to withstand the high torque and force of impact tools.

Standard Clearance


		6-Point Socket

3/4" Square Drive, 1" Square Drive, and 1 1/2" Square Drive—_3/4", 1", and 1 _1/2" square drive size sockets require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.

	Sockets									Retaining Rings
		Clearance Dp.
	Drive Size	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
3/4" Square Drive



		2 3/4"	2"	2 1/2"	2"	Black-Oxide Steel	3 1/2"	6-Point	5552A341	0000000	5552A182	00000


		1" Square Drive



				2 3/4"	1 3/4"	2 13/32"	2 1/2"	Black-Oxide Steel	3 9/16"	6-Point	5550A81	000000	5550A613	0000


				1 1/2" Square Drive



						2 3/4"	1 3/4"	2 1/2"	3 3/8"	Black-Oxide Steel	4 3/8"	6-Point	7196A64	000000	7196A614	0000

Deep Clearance


		6-Point Socket

3/4" Square Drive and 1" Square Drive—_3/4", 1", and 1 _1/2" square drive size sockets require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.

	Sockets									Retaining Rings
		Clearance Dp.
	Drive Size	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
3/4" Square Drive



		2 3/4"	3"	3 1/2"	2"	Black-Oxide Steel	4 1/2"	6-Point	5552A441	0000000	5552A182	00000


		1" Square Drive



				2 3/4"	1 3/4"	3 1/2"	2 1/2"	Black-Oxide Steel	5"	6-Point	5550A754	000000	5550A613	0000

12-Point Sockets

The 12-point shape quickly positions on hex fasteners. These sockets are for hand-driven use only.

Chrome-Plated Steel


Standard Clearance	12-Point Socket

					Standard Clearance
	Drive Size	OD	Socket Shape	For Drive Style	Overall Lg.		Each
1" Square Drive



		2 3/4"	3 23/32"	12-Point	External 12-Point, External Hex	3 13/16"	5546A43	0000000

Striking Box Wrenches

6-Point Opening

Also known as slugging wrenches, strike the handle with a hammer to break stuck fasteners free.

	Overall Lg.	Head Thk.	Material	Specs. Met		Each
6-Point Opening



	2 3/4"	14 1/2"	1 5/8"	Painted Steel	ASME B107.410	8341A501	0000000