38 mm 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.

Corrosion-Resistant Wear-Resistant 420 Stainless Steel—The most corrosion-resistant wrenches we offer. Stronger than other types of stainless steel, they'll withstand years of use without breaking or warping.

			Box End		Open End
	Drive Size, mm	Overall Lg.	Head Offset Angle	Head Thick.	Opening Angle	Head Thick.	Specs. Met		Each
12-Point Opening







				Corrosion-Resistant Wear-Resistant 420 Stainless Steel

				38	16 5/16"	15°	13/16"	15°	5/8"	DIN 3113	91827A118	0000000

Tight-Clearance Open-End Wrench Sets

Round

Opening

Twist various sizes of thin fasteners in cramped spots where other wrenches are too bulky. With a head and handle about half as thick as standard wrenches, it's easier to grip nuts found in electrical enclosures and small machinery. These wrenches are ASME certified—they handle more torque than run-of-the-mill alternatives and precisely fit fasteners so they don't round them off. Drop forged for added strength, they will be part of your toolbox for life. Also known as check nut or service wrenches.

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

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.

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

	Opening Angle	Appearance	Container Type	Specs. Met		Each
Round Opening







	Chrome-Plated Steel

	11	19 mm 21 mm 22 mm 24 mm 27 mm 30 mm 32 mm 36 mm 37 mm 38 mm 40 mm	6 3/8" to 8"	30°	Dull	Plastic Roll-Up Pouch	ASME B107.100	5746A21	0000000

Tight-Clearance Open-End Wrenches


		Round Opening

Twist thin fasteners in cramped spots where other wrenches are too bulky. With a head and handle about half as thick as standard wrenches, it's easier to grip nuts found in electrical enclosures and small machinery. These wrenches are ASME certified—they handle more torque than run-of-the-mill alternatives and precisely fit fasteners so they don't round them off. Drop forged for added strength, they will be part of your toolbox for life. Also known as check nut or service wrenches.

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

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.

	Head Thk.	Appearance	Specs. Met		Each
Round Opening







	Black-Oxide Steel

	38	11 3/8"	15°	7/16"	—	ASME B107.100	5742A21	000000




			Chrome-Plated Steel

			38	7 3/4"	30°	9/32"	Dull	ASME B107.100	5746A11	00000

Wrench Heads


Wrench and Socket Extension Not Included

Reach nuts obstructed by a fluid line or other barrier with these wrench heads. Connect them to your socket extension and ratchet wrench to turn fasteners where clearance is limited from both the top and side. You can also attach one directly to your ratchet wrench to convert it into an open-ended ratcheting wrench. Also known as crowfoot wrenches.

	Overall Lg.	Thk.	Ctr.-to-Ctr. Lg.	Material	Wrench Opening Shape		Each
1/2" Square Drive



	38	3 7/16"	3/8"	2"	Chrome-Plated Steel	Round	1882N56	000000

High-Leverage Box Wrenches

The long handle provides 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.	Overall Lg. with Extension Handle	Head Thk.	Material		Each		Each
12-Point Opening



		1 1/2", 38 mm	13 3/4"	31 7/8"	7/8"	Black-Oxide Steel	54555A54	0000000	54555A81	000000

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



		1 1/2", 38 mm	10 7/8"	45°	32 5/8"	15/16"	Black-Oxide Steel	54555A27	0000000	54555A81	000000

Budd Wheel Impact Socket Sets

4-Point

Socket

6-Point

Socket

Retaining Rings

Remove and install dual wheels on trucks and trailers with the sockets in these sets. The sockets are extra deep for use with Budd wheels, so you can remove both the nut and the stud with a single socket. Sets include sockets for hex drives to access lug nuts and sockets for square drives to turn the threaded shafts on inner wheels. All are impact sockets, made to withstand the high torque and force of impact tools. Use them 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
	No. of Pieces	Includes	Color	Overall Lg.	Container Type	Socket Shape		Each		Each
1" Square Drive—Phosphate-Coated Steel



		5	Square Sockets: 17 mm, 20 mm, 21 mm, 13/16" Hex Sockets: 35 mm, 38 mm, 41 mm, 33 mm, 1 1/2"	Black	5 5/8"	Plastic Case	4-Point, 6-Point	90479A110	0000000	5550A611	00000

12-Point Socket Sets

Made in the U.S.A., these tools handle the toughest industrial applications, provide the best grip on fasteners, and have a superior finish. The 12-point shape quickly positions on hex fasteners.

Sockets with Drive Tools—Chrome-Plated Steel


	12-Point Socket

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
3/4" Square Drive



	30	24 Sockets 2 Drive Tools 3 Extensions Universal Joint	Standard: 19 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 35 mm; 36 mm, 38 mm, 41 mm Standard (cont.): 42 mm, 46 mm, 50 mm, 54 mm, 55 mm, 58 mm, 60 mm 17 1/2" Long Sliding-Head Wrench Handle 24" Long Ratchet Wrench 3 1/2" Long Extension 8" Long Extension, 16" Long Extension	Metal Case	12-Point	19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 35, 36, 38, 41, 42, 46, 50, 54, 55, 58, 60	7874N112	000000000

Socket Organizers

		Each
Foam Socket Organizer for 22 Piece 3/4" Square Drive Size Set	5243A22	0000000

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, mm	OD	Socket Shape	For Drive Style	Overall Lg.		Each
1/2" Square Drive



		38	2 1/32"	12-Point	External 12-Point, External Hex	2 1/4"	7149A93	000000


		3/4" Square Drive



				38	2 3/32"	12-Point	External 12-Point, External Hex	2 3/8"	7312A37	00000

6-Point Sockets

The hex shape achieves the best possible grip on hex fasteners to prevent rounding their points. For use with hand-drive tools only.

Chrome-Plated Steel


Deep Clearance	6-Point Socket

					Deep Clearance
	Drive Size, mm	OD	Socket Shape	For Drive Style	Overall Lg.		Each
3/4" Square Drive



		38	2 1/32"	6-Point	External Hex	3 1/2"	5543A207	000000

Spanner Sockets


Socket Shown With Wrench (Sold Separately)

4-Pin

For easy tightening and loosening, these sockets have pins that grip the slotted sides on bearing nuts. These sockets require less clearance around bearings than standard hook spanner wrenches, so they’re good in tight spaces. Use them with a square-drive wrench handle or a ratchet wrench; they’re not for use with impact wrenches.

							Clearance Dp., mm
	Drive Size, mm	Overall Lg., mm	OD, mm	For Nut Thread Size	For Bearing Nut Specs. Met	For Nut Dia., mm	Nut	Bolt	Material		Each
4-Pin Socket







				3/8" Square Drive

				38	76	49.5	M25	ISO 2982-2	38	—	52	Steel	5510N151	0000000




						1/2" Square Drive

						38	82	46	M25	DIN 981, ISO 2982	38	10.4	56	Steel	5510N181	000000

Economy 6-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported. The hex shape grips hex fasteners and prevents rounding.

Sockets—Chrome-Plated Steel


Metal Clip Rail	6-Point Socket

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
3/4" Square Drive



	15	15 Sockets	Deep: 19 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm, 35 mm, 36 mm, 38 mm, 41 mm, 46 mm, 50 mm, 55 mm, 60 mm	Metal Clip Rail	6-Point	19, 22, 23, 24, 27, 30, 32, 35, 36, 38, 41, 46, 50, 55, 60	5894A209	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 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, mm	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
1/2" Square Drive



		38	1 3/16"	1 11/32"	—	Black-Oxide Steel	2 1/4"	6-Point	7205A98	000000	———	0


		3/4" Square Drive



				38	1"	1 21/64"	1 5/8"	Black-Oxide Steel	2 3/8"	6-Point	54175A85	00000	5552A38	00000


				1" Square Drive



						38	7/8"	1 1/2"	2"	Black-Oxide Steel	2 11/16"	6-Point	54155A18	00000	5550A611	0000

Deep Clearance


		6-Point Socket

3/4" 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, mm	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
3/4" Square Drive



		38	2 3/8"	2 3/8"	1 3/4"	Black-Oxide Steel	3 1/2"	6-Point	54175A33	000000	5552A181	00000

Budd Wheel Impact Sockets

Remove and install dual wheels on trucks and trailers—these sockets have a hex recess for accessing lug nuts and a square recess to turn the threaded shafts found on inner wheels. They are made to withstand the high torque and force of impact tools.

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.

Zinc-Phosphate-Coated Steel

	Sockets									Retaining Rings
							Deep Clearance
	Drive Size, mm	Square Recess Size, mm	Compatible Retaining Ring ID	OD	Socket Shape	For Drive Style	Overall Lg.		Each		Each
1" Square Drive



		38	20	2"	2 13/64"	6-Point	External Hex	3 13/16"	90478A120	000000	5550A611	00000

6-Point Impact Socket Sets


	6-Point Socket

The hex shape grips hex fasteners and prevents rounding. These sockets are made to withstand the high torque and force of impact tools.

3/4" Square Drive—_3/4" 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.

	Components Included	Includes	Socket Shape		Each
3/4" Square Drive—Black-Oxide Steel



	14	14 Sockets	Deep: 19 mm, 21 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm, 33 mm, 35 mm, 36 mm, 38 mm, 41 mm	6-Point	53105A107	0000000

Impact Hex Bit Sockets


	For Hex Drives

These sockets are made to withstand the high torque and force of impact tools.

Compatible Retaining Ring ID—Sockets that list a compatible retaining ring ID 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.

	Bit Sockets								Retaining Rings
	Drive Size, mm	Overall Lg.	Compatible Retaining Ring ID	Material	Bit Replaceable	For Drive Style		Each		Each
1" Square Drive



		38	3 15/16"	1 3/4"	Black Oil-Coated Steel	No	Hex	54615A61	0000000	5550A68	00000


		1 1/2" Square Drive



				38	4 3/4"	2 7/8"	Black Oil-Coated Steel	No	Hex	54615A91	000000	7196A75	0000