27 mm Wrenches | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

Forward

How can we improve?

49 Products

About Torque Tools


12-Point Box Opening
12-Point Box 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.

Polished wrenches have a mirror-like finish.

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

		Box End		Open End				Dull Chrome Plated		Polished Chrome Plated
Drive Size	Overall Lg.	Head Offset Angle	Head Thick.	Opening Angle	Head Thick.	Material	Specifications Met		Each		Each
12-Point Box Opening
27 mm	14 1/2"	15°	21/32"	15°	15/32"	Steel	ASME B107.100	0000000	000000	000000	00
27 mm	15 1/4"	15°	39/64"	15°	5/8"	Steel	ASME B107.100	000000	00	0000000	000000

Corrosion-Resistant Combination Wrenches

These wrenches are made of stainless steel for excellent corrosion resistance.

12-Point Box Opening
Size	Overall Lg.	Head Thick.	Box-End Head Offset Angle	Open-End Opening Angle	Material	Specifications Met		Each
27 mm	11 7/16"	15/32"	15°	15°	420 Stainless Steel	DIN 3113	000000000	0000000

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
Size	Overall Lg.	Head Thick.	Turn Required to Ratchet	Opening Angle	Head Thick.	Material	Appearance		Each
12-Point Box Opening
27 mm	14 1/4"	1/2"	5°	10°	1/2"	Chrome-Plated Steel	Polished	0000000	000000

Spline Ratcheting Combination Wrenches

A spline-shaped box end turns spline, hex, and 12-point fasteners with minimal effort. This shape also gets a better grip on rounded fasteners that can be difficult to turn with a traditional wrench. These wrenches have a ratchet mechanism that allows you to turn fasteners in tight spaces without removing and repositioning. Flip over to ratchet in the opposite direction. Wrenches are polished for a mirror-like finish.

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

Box End
External Hex/12-Point Size	External Spline Size	Head Offset Angle	Head Thick.	Turn Required to Ratchet	Size	Head Thick.	Opening Angle	Overall Lg.	Material	Appearance		Each
27 mm	No. 27	15°	39/64"	5°	27 mm	15/32"	15°	14 15/16"	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.

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

Metric Wrench Sets—12-Point Box Opening
Size	Overall Lg.	Box-End Head Offset Angle	Open-End Opening Angle	Material	Finish	Appearance	Container Type		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 29 mm 30 mm 32 mm	5 3/8"-17"	15°	15°	Steel	Chrome Plated	Polished	Fabric Pouch	0000000	0000000

Open-End Wrenches

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

Metric
Drive Size	Overall Lg.	Opening Angle	Head Thick.	Material	Finish	Specifications Met		Each
Rounded Opening
27 mm	9 3/8"	15°	25/64"	Steel	Black Phosphate Coated	DIN 894	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.

					Dull Chrome Plated
Size	Overall Lg.	Opening Angle	Head Thick.	Material		Each
Rounded Openings
24 mm × 27 mm	11"	15°	21/64" × 21/64"	Steel	0000000	000000
27 mm × 30 mm	11 7/8"	15°	3/8" × 3/8"	Steel	0000000	00000

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
27 mm × 27 mm	10"	15° × 60°	5/16" × 5/16"	Steel	ASME B107.100	0000000	000000

Tight-Clearance Open-End Wrenches

Fit the narrow head into tight spaces and around thin fasteners.

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

						Dull Chrome Plated		Black Oxide
Drive Size	Overall Lg.	Opening Angle	Head Thick.	Material	Specifications Met		Each		Each
Rounded Opening
Metric
27 mm	6 7/8"	30°	1/4"	Steel	ASME B107.100	000000	000000	000000	00
27 mm	8 1/2"	15°	1/4"	Steel	ASME B107.100	000000	00	0000000	000000

Two-Head Tight-Clearance Open-End Wrenches

These tools have narrow heads that fit into tight spaces and around thin fasteners. They are also known as tappet wrenches.

Size	Overall Lg.	Opening Angle	Head Thick.	Material	Appearance		Each
27 mm × 30 mm	12 1/4"	15°	15/64" × 15/64"	Chrome-Plated Steel	Polished	00000000	000000

Secure-Grip Open-End Wrenches

The opening shape makes more contact with fasteners for a better grip than standard open-end wrenches. These tools are also known as flare-nut or line wrenches.

12-Point Secure-Grip Openings

Size	Overall Lg.	Opening Angle	Head Offset Angle	Head Thick.	Material	Appearance	Specifications Met		Each
24 mm × 27 mm	10 1/8"	15°	15°	45/64" × 43/64"	Chrome-Plated Steel	Dull	DIN 3118	00000000	000000

Striking Open-End Wrenches

Strike the handle with a hammer to break stuck fasteners free. These are also known as slugging wrenches.

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

Rounded Opening
Drive Size	Overall Lg.	Opening Angle	Head Thick.	Material		Each
Metric
27 mm	7 1/8"	15°	5/8"	Steel	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		Each
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	0000000

60° Angle Open-End Wrench Sets

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

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

						Dull Chrome Plated
Sizes Included	Overall Lg.	Opening Angle	Material	Container Type	Specifications Met		Each
Metric Wrench Sets
15-Piece Sets
10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 18 mm 19 mm 21 mm 22 mm 24 mm 27 mm 30 mm	4 3/4"-11"	15° × 60°	Steel	Plastic Roll-Up Pouch	ASME B107.100	0000000	0000000

Tight-Clearance Open-End Wrench Sets

Fit the narrow head into tight spaces and around thin fasteners.

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

Metric Wrench Sets
Sizes Included	Overall Lg.	Opening Angle	Material	Finish	Appearance	Container Type	Specifications Met		Each
11-Piece Sets
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"-8"	30°	Steel	Chrome Plated	Dull	Plastic Roll-Up Pouch	ASME B107.100	0000000	0000000

6-Point Sockets

Standard

Deep

Achieve the best possible grip on hex fasteners and prevent rounding.

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

			Standard			Deep
Size	Material	Specifications Met	Overall Lg.		Each	Overall Lg.		Each
1/2" Square Drive
27 mm	Chrome-Plated Steel	ASME B107.110, SAE AS955	1 11/16"	0000000	000000	__	000000	00
27 mm	Chrome-Plated Steel	ASME B107.5M	__	000000	00	3 1/4"	00000000	000000

Extra-Deep 6-Point Sockets

Extra length allows access to fasteners on long bolts. These sockets have a hex shape that provides the best possible grip on hex fasteners and prevents rounding.

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

1/2" Square Drive
Size	Overall Lg.	OD	Material		Each
27 mm	6 1/4"	1 1/2"	Zinc-Plated Steel	00000000	000000

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
1/2" Square Drive
27 mm	Steel	1 11/16"	0000000	000000	3 1/4"	0000000	000000
3/4" Square Drive
27 mm	Steel	2 1/16"	0000000	00000	__	000000	00

Universal-Fit Sockets

Turn many sizes of square, hex, and 8-point fasteners with one socket. Place over the fastener and 54 pins move to grip it securely.

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

1/2" Square 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	0000000	000000

Tight-Clearance Offset Sockets

Often used with an extension, these sockets turn fasteners and fittings in obstructed areas that a regular socket can't reach. They are also known as crowfoot wrenches.

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

1/2" Square Drive
Size	Overall Lg.	Thick.	Center-to-Center Lg.	Material		Each
27 mm	2 15/16"	3/8"	1 3/4"	Chrome-Plated Steel	0000000	000000

Hex Bit Sockets

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

1" Square Drive
Size	Overall Lg.	Material	Bit Replaceable		Each
27 mm	3 9/16"	Chrome-Plated Steel	No	0000000	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.

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
Size	Nut	Bolt	Compatible Retaining Ring ID	Material	Finish	Overall Lg.		Each		Each
1/2" Square Drive
27 mm	1 1/4"	1 9/32"	__	Steel	Black Oxide	2"	0000000	000000	000000	00
3/4" Square Drive
27 mm	13/16"	1 1/8"	1 7/16"	Steel	Black Oxide	2 1/16"	00000000	00000	0000000	00000
1" Square Drive
27 mm	5/8"	1 21/32"	1 3/4"	Steel	Black Oxide	2 9/16"	000000000	00000	0000000	0000

Deep

Sockets
	Clearance Depth								Retaining Rings
Size	Nut	Bolt	Compatible Retaining Ring ID	Material	Finish	Overall Lg.		Each		Each
1/2" Square Drive
27 mm	25/32"	2 7/64"	__	Steel	Black Oxide	3 1/2"	0000000	000000	000000	00
3/4" Square Drive
27 mm	7/8"	2 1/4"	1 7/16"	Steel	Black Oxide	3 1/4"	0000000	00000	0000000	00000
1" Square Drive
27 mm	5/8"	2 3/4"	1 3/4"	Steel	Black Oxide	3 9/16"	00000000	00000	0000000	0000

Impact Hex Bit Sockets

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

3/4" and 1” 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.

Sockets								Retaining Rings
Size	Overall Lg.	Compatible Retaining Ring ID	Material	Finish	Bit Replaceable		Each		Each
3/4" Square Drive
27 mm	3 1/2"	1 7/16"	Steel	Black Oxide	No	0000000	000000	0000000	00000

Premium 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—Chrome-Plated Steel

1/2" Square Drive
No. of Pieces	Includes		Each
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	0000000	0000000
3/4" Square Drive
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	0000000	000000

Sockets with Drive Tools—Chrome-Plated Steel

1/2" Square Drive
No. of Pieces	Components Included	Includes		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	00000000	0000000

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

0000000

Each

0000000

6-Point Impact Socket Sets

Sockets

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 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.

1/2" Square Drive—Steel
No. of Pieces	Components Included	Includes	Finish		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	Black Oxide	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	Black Oxide	0000000	000000
3/4" Square Drive—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	Black Oxide	00000000	000000

Impact Hex Bit Socket Sets

Plastic Case

Use these sockets as an alternative to a screwdriver or L-key. They are made to withstand the high torque and force of impact tools.

1" Square Drive—Black-Oxide Steel
No. of Pieces	Includes	Overall Lg.	Container Type		Each
6	Bit Sockets: 14 mm, 17 mm, 19 mm, 22 mm, 24 mm, 27 mm (4" O'all Lg.)	4"	Plastic Case	0000000	0000000

Ratcheting Box Wrenches

12-Point Opening

A ratchet mechanism allows you to turn fasteners in tight spaces without removing and repositioning the wrench. The smaller the turn required to ratchet, the less clearance you need to engage the ratchet.

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

Metric
Drive Size	Overall Lg.	Head OD	Head Thick.	Turn Required to Ratchet	Material	Grip Material	Specifications Met		Each
12-Point Opening
27 mm	12"	1 15/16"	9/16"	20°	Chrome-Plated Steel	Plastic	Fed. Spec. GGG-W-001405	0000000	000000

Changeable-Head Torque Wrenches

Change heads to use these tools as an open-end, box, square drive, or hex-key wrench. When the set torque is reached, these wrenches indicate with an audible click and a momentary release. To reverse torque-limiting direction, remove head, turn handle over, and reattach head. The handle and head combination you choose may have different maximum torque values. Do not exceed the lower value.

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

Open-End Heads

Hex

Hex
Drive Size	Max. Torque	Opening Angle	Material	Finish		Each
27 mm	2,248 in.-lbs.	15°	Steel	Black	00000000	000000

L-Keys

Standard Tip

Hex

Turn fasteners from either end and reach into tight spots.

	Length
Drive Size	Overall	Long Leg	Short Leg	Material	Finish		Each
Standard Tip
Hex
27 mm	10 11/16"	9 3/8"	3 13/16"	Steel	Black Phosphate Coated	0000000	000000
27 mm	17 5/16"	16 1/4"	4 7/8"	Steel	Black Phosphate Coated	0000000	00000

High-Visibility L-Keys

Blue

Hex

A bright finish makes these tools stand out, so they’re less likely to be misplaced. They 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
Hex
Blue
27 mm	9 1/2"	9 1/2"	3 7/8"	Painted Steel	0000000	0000000