21 mm Wrenches | McMaster-Carr

Filter by

System of Measurement

Drive Size

Wrench Style

Wrench Opening Shape

Head Style

Number of Pieces

Sold As

Ratcheting or Nonratcheting

Overall Length

Finish

Drive Style

Appearance

Container Type

Opening Angle

Material

Square Drive Size

Number of Heads

Wrench Type

RoHS Compliance

For Use With

Head Thickness

DFARS Compliance

REACH Compliance

Forward

How can we improve?

77 Products

Combination Wrenches

Corrosion-Resistant Combination Wrenches

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

Ratcheting Combination Wrenches

Flip these wrenches over to ratchet in the opposite direction.

Reversible Ratcheting Combination Wrenches

A lever reverses the ratchet direction.

Spline Ratcheting Combination Wrenches

A spline-shaped box end turns spline, hex, and 12-point fasteners. This shape also gets a better grip on rounded fasteners that can be difficult to turn with a traditional wrench.

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.

Economy Reversible Ratcheting
Combination Wrench Sets

Suitable for occasional maintenance work, these sets are imported.

Open-End Wrenches

Two-Head Open-End Wrenches

60° Angle Open-End Wrenches

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

Tight-Clearance Open-End Wrenches

The slim head fits into tight spaces and around thin fasteners.

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.

Open-End Wrench Sets

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.

Tight-Clearance Open-End Wrench Sets

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

Square Drive Sockets and Ratchet Wrenches

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.

6-Point Sockets

The hex shape achieves the best possible grip on hex fasteners to prevent rounding their points.

12-Point Sockets

Universal-Fit Sockets

Turn multiple shapes and sizes of fasteners with a single socket.

6-Point Impact Sockets

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

Nonmarring 6-Point Impact Sockets

Tighten or loosen nuts and bolts without damaging the finish.

12-Point Impact Sockets

The 12-point shape quickly positions on hex fasteners.

Impact Hex Bit Sockets

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.

Economy 6-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported.

Fastener-Holding 6-Point Socket Sets

Two spring-loaded balls inside these sockets firmly hold nuts and bolts in place as you turn them, including nonmagnetic fasteners like stainless steel screws.

Economy 12-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported.

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.

6-Point Impact Socket Sets

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

Nonmarring 6-Point Impact Socket Sets

Tighten or loosen nuts and bolts without damaging the finish.

Budd Wheel Impact Socket Sets

Remove and install dual wheels on trucks and trailers with the sockets in these sets.

Box Wrenches

Deep-Offset Box Wrenches

The heads are angled to provide clearance around obstructions.

Two-Head Ratcheting Box Wrenches

Ratchet mechanisms allow you to turn fasteners in tight spaces without removing and repositioning the tool.

Two-Head Deep-Offset Ratcheting Box Wrenches

The 25° offset heads give you additional clearance to turn hard-to-reach fasteners.

Lug Wrenches

Turn lug bolts on car and truck wheels. These wrenches have a different socket size at each end.