3 7/8" Hex Drivers | McMaster-Carr

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7 Products

Combination Wrenches

12-Point

Opening

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.

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







				Black-Oxide Steel

				3 7/8"	40"	15°	2 1/4"	15°	1 1/2"	Dull	7242A69	000000000

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

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
1" Square Drive



		3 7/8"	2 1/2"	3 29/32"	3 1/8"	Black-Oxide Steel	5 1/4"	6-Point	5550A142	0000000	5550A156	00000

Deep Clearance


		6-Point Socket

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



		3 7/8"	2 1/2"	5"	3 1/8"	Black-Oxide Steel	6 3/8"	6-Point	5550A766	0000000	5550A156	00000

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



	3 7/8"	18"	45°	2 3/8"	Black-Oxide Steel	ASME B107.100	5455A64	0000000

Striking Box Wrenches

6-Point Opening

12-Point Opening

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

12-Point Opening—Wrenches with a 12-point opening are easier to position on hex fasteners than wrenches with a 6-point opening but make less contact.

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



	3 7/8"	14 1/2"	1 23/32"	Black-Oxide Steel	ASME B107.100	8341A55	0000000


	12-Point Opening



			3 7/8"	14 1/2"	1 23/32"	Black-Oxide Steel	ASME B107.100	5456A37	000000