20 mm Wrenches | McMaster-Carr

		Box End		Open End
Drive Size	Overall Lg.	Head Offset Angle	Head Thick.	Opening Angle	Head Thick.	Material	Specifications Met		Each
Dull Chrome Plated
12-Point Box Opening
20 mm	10 13/16"	15°	1/2"	15°	27/64"	Steel	ASME B107.100	0000000	000000
Polished Chrome Plated
12-Point Box Opening
20 mm	10 7/8"	15°	1/2"	15°	27/64"	Steel	ASME B107.100	0000000	00000
Black Oxide
12-Point Box Opening
20 mm	10 13/16"	15°	1/2"	15°	27/64"	Steel	ASME B107.100	00000000	00000

Ratcheting Combination Wrenches

A ratchet mechanism in the box end allows you to turn fasteners in tight spaces without removing and repositioning the wrench. Flip these wrenches over to ratchet in the opposite direction. The smaller the turn required to ratchet, the less clearance you need to engage the ratchet. Wrenches are polished for a mirror-like finish.

For technical drawings and 3-D models, click on a part number.

		Box End		Open End
Drive Size	Overall Lg.	Head Thick.	Turn Required to Ratchet	Opening Angle	Head Thick.	Material	Appearance		Each
Metric—12-Point Box Opening
20 mm	11"	1/2"	5°	10°	3/8"	Chrome-Plated Steel	Polished	0000000	000000

Premium Combination Wrench 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. Wrenches with a 12-point opening are easier to position on hex fasteners than wrenches with a 6-point opening but make less contact. Polished wrenches have a mirror-like finish.

Metric Wrench Sets—12-Point Box Opening
Drive Size	Overall Lg.	Box-End Head Offset Angle	Open-End Opening Angle	Material	Finish	Appearance	Container Type	Specifications Met		Each
15-Piece Sets
7 mm 8 mm 10 mm 12 mm 14 mm 16 mm 18 mm 20 mm 22 mm 24 mm 26 mm 27 mm 30 mm 32 mm	5 3/8"-17"	15°	15°	Steel	Chrome Plated	Polished	Fabric Pouch	__	0000000	0000000
17-Piece Sets
6 mm 7 mm 8 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 18 mm 19 mm 20 mm 21 mm 22 mm	5"-11 3/4"	15°	15°	Steel	Chrome Plated	Dull	Fabric Pouch	__	0000000	000000
18-Piece Sets
7 mm 8 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 18 mm 19 mm 20 mm 21 mm 22 mm 23 mm 24 mm	5 1/4"-12 3/4"	15°	15°	Steel	Chrome Plated	Polished	Fabric Roll-Up Pouch	ASME B107.100	0000000	000000

Two-Head Open-End Wrenches

Rounded Openings

Wrenches with square openings provide the best grip on square fasteners.

For technical drawings and 3-D models, click on a part number.

				Polished Chrome Plated
Drive Size	Opening Angle	Material	Specifications Met		Each
Metric
Rounded Openings
20 mm × 22 mm	15°	Steel	ASME B107.100	0000000	000000

60° Angle Open-End Wrenches

One head is angled 60° for access to hard-to-reach fasteners. These tools are also known as ignition wrenches.

For technical drawings and 3-D models, click on a part number.

						Dull Chrome Plated
Drive Size	Overall Lg.	Opening Angle	Head Thick.	Material	Specifications Met		Each
Metric
Hex Openings
20 mm × 20 mm	7 1/4"	15° × 60°	9/32" × 9/32"	Steel	ASME B107.100	0000000	000000

Open-End Wrench Sets

For technical drawings and 3-D models, click on a part number.

Metric Wrench Sets
Sizes Included	Overall Lg.	Opening Angle	Material	Appearance	Container Type	Specifications Met		Each
10-Piece Sets
6 mm × 7 mm 8 mm × 9 mm 10 mm × 11 mm 12 mm × 13 mm 14 mm × 15 mm 16 mm × 17 mm 18 mm × 19 mm 20 mm × 22 mm 21 mm × 23 mm 24 mm × 26 mm (Dull Appearance)	4 1/2"-12 3/8"	15°	Chrome-Plated Steel	Polished	Fabric Roll-Up Pouch	ASME B107.100	0000000	0000000
12-Piece Sets
6 mm × 7 mm 8 mm × 9 mm 10 mm × 11 mm 12 mm × 13 mm 14 mm × 15 mm 16 mm × 17 mm 18 mm × 19 mm 20 mm × 22 mm 21 mm × 23 mm 24 mm × 26 mm 25 mm × 28 mm 27 mm × 30 mm	4 1/2"-11 7/8"	15°	Chrome-Plated Steel	Dull	Plastic Roll-Up Pouch	__	0000000	000000

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.

For technical drawings and 3-D models, click on a part number.

Metric
Drive Size	Overall Lg.	Thick.	Center-to-Center Lg.	Material		Each
3/8" Square Drive
20 mm	1 7/8"	1/4"	1"	Chrome-Plated Steel	0000000	000000
1/2" Square Drive
20 mm	2 5/8"	3/8"	1 5/8"	Chrome-Plated Steel	0000000	00000

6-Point Sockets

Standard

Deep

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

For technical drawings and 3-D models, click on a part number.

		Standard			Deep
Drive Size	Material	Overall Lg.		Each	Overall Lg.		Each
Metric
3/8" Square Drive
20 mm	Chrome-Plated Steel	1 3/16"	0000000	00000	2 3/4"	0000000	000000
1/2" Square Drive
20 mm	Chrome-Plated Steel	1 1/2"	0000000	00000	3 1/4"	00000000	0000

12-Point Sockets

Standard

Deep

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

For technical drawings and 3-D models, click on a part number.

		Standard			Deep
Drive Size	Material	Overall Lg.		Each	Overall Lg.		Each
Metric
Chrome Plated
3/8" Square Drive
20 mm	Steel	1 3/16"	0000000	00000	2 3/4"	0000000	000000
1/2" Square Drive
20 mm	Steel	1 1/2"	0000000	00000	3 1/4"	0000000	00000
3/4" Square Drive
20 mm	Steel	2"	0000000	00000	__	000000	00

Universal-Fit Sockets

Turn multiple shapes and sizes of fasteners with a single socket. Use these on hex, square, and other external-drive fasteners—even wing nuts. Place the socket over the nut or screw head and the 54 pins move to grip it securely. For use with hand-drive tools only.

For technical drawings and 3-D models, click on a part number.

Sockets

1/2" Square Drive
Drive Size	Overall Lg.	OD	Material		Each
7/16"-1 1/4", 11 mm-32 mm	3 1/2"	1 11/16"	Chrome-Plated Steel	00000000	000000

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.

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.

For technical drawings and 3-D models, click on a part number.

Standard

Sockets
	Clearance Depth								Retaining Rings
Drive Size	Nut	Bolt	Compatible Retaining Ring ID	Material	Finish	Overall Lg.		Each		Each
3/8" Square Drive
20 mm	17/32"	19/32"	__	Steel	Black Oxide	1 1/8"	0000000	000000	000000	00
1/2" Square Drive
20 mm	13/16"	27/32"	__	Steel	Black Oxide	1 1/2"	0000000	00000	000000	00
3/4" Square Drive
20 mm	9/16"	63/64"	1 7/16"	Steel	Black Oxide	1 15/16"	00000000	00000	0000000	00000

Deep

	Clearance Depth
Drive Size	Nut	Bolt	Material	Finish	Overall Lg.		Each
3/8" Square Drive
20 mm	15/32"	1 3/4"	Steel	Black Oxide	2 5/8"	0000000	000000
1/2" Square Drive
20 mm	35/64"	1 61/64"	Steel	Black Oxide	3 1/4"	0000000	00000

6-Point Flex Impact Sockets

Standard

Pivot the head to access fasteners from an angle. These sockets have a hex shape that grips hex fasteners and prevents rounding. They are made to withstand the high torque and force of impact tools.

For technical drawings and 3-D models, click on a part number.

	Clearance Depth
Drive Size	Nut	Bolt	Material	Finish	Overall Lg.		Each
Standard
1/2" Square Drive
20 mm	33/64"	5/8"	Steel	Black Oxide	2 9/16"	0000000	000000

12-Point Impact Sockets

The 12-point shape quickly positions on hex fasteners. These sockets are made to withstand the high torque and force of impact tools.

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.

For technical drawings and 3-D models, click on a part number.

Standard

	Clearance Depth
Drive Size	Nut	Bolt	Material	Finish	Overall Lg.		Each
1/2" Square Drive
Metric
20 mm	27/32"	21/32"	Steel	Black Oxide	1 1/2"	0000000	000000

6-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 hex shape grips hex fasteners and prevents rounding.

Sockets—Chrome-Plated Steel

3/8" Square Drive
No. of Pieces	Includes	Container Type		Each
18	20 mm, 21 mm, 22 mm, 23 mm Deep Sockets: 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm,	Metal Clip Rail	00000000	0000000
21	21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm Standard Sockets: 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm,	Metal Clip Rail	00000000	000000
1/2" Square Drive
15	Standard Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm	Metal Clip Rail	000000	000000
16	21 mm, 22 mm, 23 mm, 24 mm Deep Sockets: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm,	Metal Clip Rail	00000000	000000
24	23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm Deep Sockets: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm,	Metal Clip Rail	00000000	000000
24	24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm Standard Sockets: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm,	Metal Clip Rail	00000000	000000

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.

For technical drawings and 3-D models, click on a part number.

Sockets

3/8" Square Drive—Steel
No. of Pieces	Includes	Finish		Each
21	Standard Sockets: 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm	Chrome Plated	00000000	0000000
1/2" Square Drive—Steel
15	Standard Sockets: 10 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm	Chrome Plated	0000000	000000
15	Deep Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 24 mm, 25 mm	Chrome Plated	0000000	000000
23	Deep Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 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	Chrome Plated	00000000	000000
24	Standard Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 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, 36 mm	Chrome Plated	00000000	000000
3/4" Square Drive—Steel
13	Standard Sockets: 19 mm, 20 mm, 22 mm, 24 mm, 27 mm, 30 mm, 32 mm, 36 mm, 41 mm, 46 mm, 50 mm, 55 mm, 60 mm	Chrome Plated	0000000	000000

Sockets with Drive Tools

1/2" Square Drive—Steel
No. of Pieces	Components Included	Includes	Finish		Each
20	17 Sockets 2 Drive Tools 1 Extension	Standard Sockets: 10 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm, 36 mm 10 3/8" Long Ratchet Wrench 15 1/2" Long Flex-Head Wrench Handle 5" Long Extension	Chrome Plated	00000000	0000000
28	26 Sockets 2 Drive Tools	Standard Sockets: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm Deep Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm 10" Long Ratchet Wrench 24" Long Flex-Head Wrench Handle	Chrome Plated	00000000	000000

Foam Socket Organizer for 22 Piece 3/4" Square Drive Size Set

0000000

Each

0000000

Economy 12-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported. The 12-point shape quickly positions on hex fasteners.

Sockets—Chrome-Plated Steel

1/2" Square Drive
No. of Pieces	Includes		Each
13	Standard Sockets: 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm	0000000	000000

Sockets with Drive Tools—Chrome-Plated Steel

1/2" Square Drive
No. of Pieces	Components Included	Includes		Each
14	11 Sockets 1 Drive Tool 2 Extensions	Standard Sockets: 10 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 24 mm 7" Long Ratchet Wrench 6" Long Extension 10" Long Extension	0000000	0000000

Wrench Head Sets

Wrench and Socket Extension Not Included

Wrench Head Set with Clip Rail

Reach nuts obstructed by a fluid line or other barrier with the wrench heads in these sets. Connect them to a 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.

Inch/Metric
Wrench Opening Shape	No. of Pieces	Includes	Material	Container Type		Each
3/8" Square Drive
Rounded	30	Wrench Heads (Inch): 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" Wrench Heads (Metric): 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm	Nickel-Plated Steel	Plastic Clip Rail	00000000	0000000

Secure-Grip Wrench Head Sets

Wrench and Socket Extension Not Included

Grip more of your fastener head with these wrench heads. They have a hex or 12-point opening with more surface area than rounded wrench heads, so they make more contact with fasteners for a better hold. Also known as flare-nut crowfoot wrenches or line wrenches, they're often used with flared tube fittings as well as fuel and hydraulic lines. Connect them to a 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.

3/8" Square Drive
No. of Pieces	Includes	Material	Wrench Opening Shape		Each
18	Wrench Heads: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Nickel-Plated Steel	Hex	00000000	0000000

6-Point Impact Socket Sets

Socket Set with Metal Rail Clip

Socket Set

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

1/2" Square Drive—Black-Oxide Steel
No. of Pieces	Components Included	Includes	Container Type		Each
16	16 Sockets	Standard Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Metal Clip Rail	0000000	0000000
16	16 Sockets	Deep Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Metal Clip Rail	0000000	000000
25	25 Sockets	Standard Sockets: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	000000000	000000
25	25 Sockets	Deep Sockets: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	000000000	000000
30	30 Sockets	Standard Sockets: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 24 mm Deep Sockets: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 24 mm	__	000000000	000000
3/4" Square Drive—Black-Oxide Steel
12	12 Sockets	Standard Sockets: 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm, 36 mm, 41 mm, 46 mm	Metal Clip Rail	00000000	000000

Budd Wheel Impact Socket Sets


Budd Wheel Impact Socket Set	4-Point Socket Shape	6-Point Socket Shape
Budd Wheel Impact Socket Set	Socket Retaining Ring

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.

For technical drawings and 3-D models, click on a part number.

Socket Sets							Socket Retaining Rings
Number of Pieces	Includes	Overall Length	Material	Container Type		Each		Each
1" Drive Size
5	Deep Sockets (Square): 17 mm, 20 mm, 21 mm, 13/16" Deep Sockets (Hex): 35 mm, 38 mm, 41 mm, 33 mm, 1 1/2"	5 5/8"	Black-Phosphate Steel	Plastic Case	000000000	0000000	00000000	00000

Deep-Offset Box Wrenches

The heads are angled to provide clearance around obstructions.

For technical drawings and 3-D models, click on a part number.

12-Point Openings
Drive Size	Overall Lg.	Head Offset Angle	Head Thick.	Material	Appearance	Specifications Met		Each
Metric
20 mm × 22 mm	12 3/4"	45°	17/32" × 17/32"	Chrome-Plated Steel	Dull	ASME B107.100	0000000	000000

L-Keys

Standard Tip

Hex

Turn fasteners from either end and reach into tight spots.

For technical drawings and 3-D models, click on a part number.

	Length
Drive Size	Overall	Long Leg	Short Leg	Material		Each
Standard Tip
Hex
20 mm	8 1/16"	7 1/4"	2 7/8"	Black-Oxide Steel	0000000	000000