3/8" Square Drive Wrenches | McMaster-Carr

Filter by

System of Measurement

Square Drive Size

Drive Size

Drive Style

External 12-Point

External Pentagon

External Square

External Torx Plus

Tamper-Resistant Hex

Tamper-Resistant Torx

Tamper-Resistant Torx Plus

Bolt Clearance Type

Socket Shape

Overall Length

31/32" to 3 1/16"

Sold As

Socket Style

Socket Type

Air Hammer Adapter

Finger-Tightening Adapter

Hex Head Adapter

Hex Shank-to-Square Drive Adapter

Quick-Change Adapter

Ratchet Adapter

Secure-Hold Extension

Secure-Hold Socket Adapter

Square Drive Size Adapter

Torque-and-Angle Measuring Adapter

Torque-Limiting Adapter

OD

Finish

Magnesium Phosphate Coated

Manganese Phosphate Coated

Phosphate Coated

Length

31/32" to 3 1/16"

Drive Type

Tip Style

Material

Stainless Steel

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

RoHS

Export Control Classification Number (ECCN)

DFARS Specialty Metals

REACH

Head Style

Wrench Style

Unit of Measure

Torque

0 in·lbf to 25 in·lbf

0 in·lbf to 50 in·lbf

0 in·lbf to 100 in·lbf

0 in·lbf to 150 in·lbf

0 in·lbf to 200 in·lbf

0 in·lbf to 300 in·lbf

0 ft·lbf to 50 ft·lbf

0 in·lbf to 800 in·lbf

0 ft·lbf to 220 in·lbf

0 ft·lbf to 200 ft·lbf

0 ft·lbf to 210 ft·lbf

0 ft·lbf to 400 ft·lbf

1.25 ft·lbf to 9.16 ft·lbf

Thread Size

How can we improve?

1,307 Products

Fastening and Joining

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Wrench Handles

Generate extra torque to loosen stubborn fasteners; also known as breaker bars

Wrench Heads

Attach to your ratchet wrench and socket extension to turn fasteners where clearance is limited

Strap Wrenches

Grip plastic and high-polished pipe, tubing, hand wheels, and filters without marring the surface

Socket Adapters

Socket Adapters

Make your socket more versatile, from converting the drive to limiting torque

Socket Extensions

Socket Extensions

Lengthen sockets to turn hard-to-reach fasteners

Impact Wrenches

Impact Wrenches

Maximize torque to break frozen bolts free and drive fasteners more quickly than other wrenches

Bit Sockets

Turn fasteners with an internal drive style without slipping and damaging the drive

Oil Filter Sockets

Oil Filter Sockets

Twist with a ratchet wrench to adjust filters and other round objects in tight spots

Socket Retaining Rings

Socket Retaining Rings

Secure sockets and adapters to impact tools

Socket Drivers

Tighten and loosen sockets from above when there isn't room to swing a standard wrench

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Impact Wrench Chucks

Impact Wrench Chucks

Harness torque to cut and prepare holes faster than any other method

Bit Adapters

Connect a variety of bits to drills, powered screwdrivers, ratchet wrenches, and other turning tools

Impact Drivers

More powerful than drills to drive screws through dense material and loosen stuck fasteners

Speeder Handles

Speeder Handles

Crank the handle to fasten nuts and bolts quickly

Screw, Pipe, and Stud Extractors

Screw, Pipe, and Stud Extractors

Remove broken screws, pipes, and studs without damaging the threads around them

Containers, Storage, and Furniture

Socket Organizers

Socket Organizers

Arrange sockets at your workstation or carry them neatly around your facility

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)