3/8" Square Drive Sockets | McMaster-Carr

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System of Measurement

Drive Size

Square Drive Size

Bolt Clearance Type

Socket Shape

Drive Style

External 12-Point

External Pentagon

External Square

External Torx Plus

Tamper-Resistant Hex

Tamper-Resistant Torx

Tamper-Resistant Torx Plus

OD

Socket Style

Sold As

Overall Length

31/32" to 3 1/16"

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

Finish

Magnesium Phosphate Coated

Manganese Phosphate Coated

Phosphate Coated

Thread Size

Drive Type

Material

Stainless Steel

Tip Style

Length

31/32" to 3 1/16"

Nut Diameter

Number of Pieces

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

RoHS

Container Type

Fabric Roll-Up Pouch

Metal Clip Rail

Plastic Clip Rail

REACH

DFARS Specialty Metals

Export Control Classification Number (ECCN)

Wrench Style

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1,404 Products

Sockets

Sockets

6-Point Sockets

6-Point Sockets

Get the tightest grip possible on hex fasteners to prevent rounding their points

12-Point Sockets

12-Point Sockets

Grip hex fasteners quickly

4-Point Sockets

4-Point Sockets

Provide the tightest grip on square fasteners and prevent rounding

Stubby 6-Point Sockets

Stubby 6-Point Sockets

Fit short sockets into spaces where height clearance is limited

Spanner Sockets

Spanner Sockets

Pins grip the slotted sides on bearing nuts for easy tightening and loosening

8-Point Sockets

8-Point Sockets

Quickly position these sockets on square and external 8-point fasteners

Fastener-Holding 6-Point Sockets

Fastener-Holding 6-Point Sockets

Hold fasteners securely in place as you drive them in

Extra-Deep 6-Point Sockets

Extra-Deep 6-Point Sockets

Double the clearance of standard sockets to access nuts on extra-long bolts

6-Point Flex Sockets

6-Point Flex Sockets

Pivot the head to access hex fasteners from an angle

Open-End 6-Point Sockets

Open-End 6-Point Sockets

Slide the open side over a tube or hose to adjust a nut that’s already installed

Tri-Groove Sockets

Tri-Groove Sockets

Grip the indentations around the outside of tri-groove fasteners

Wing Nut Sockets

Wing Nut Sockets

Tighten or loosen wing nuts with more force than fingers can apply

Universal-Fit Sockets

Universal-Fit Sockets

Turn multiple shapes and sizes of fasteners with a single socket

5-Point Sockets

5-Point Sockets

Turn the nuts found on water and gas valves

External Torx-Plus Sockets

External Torx-Plus Sockets

Grasp external Torx-Plus fasteners using squared lobes that resist slipping

12-Point Flex Sockets

12-Point Flex Sockets

Pivot the head to access fasteners from an angle and the 12-point shape quickly grips them

External Torx Sockets

External Torx Sockets

Tighten and loosen fasteners with an external Torx drive

Electrically Insulating 12-Point Sockets

Electrically Insulating 12-Point Sockets

Tested to 1,000 volts for protection against accidental contact with live electrical circuits

Impact Sockets

6-Point Impact Sockets

6-Point Impact Sockets

Achieve the tightest grip on hex fasteners and prevent rounding

Thin-Wall 6-Point Impact Sockets

Thin-Wall 6-Point Impact Sockets

Fit these sockets in between tightly spaced fasteners

Fastener-Holding 6-Point Impact Sockets

Fastener-Holding 6-Point Impact Sockets

A magnet holds fasteners securely enough to drive self-tapping screws

6-Point Flex Impact Sockets

6-Point Flex Impact Sockets

Pivot the head on these sockets to access hex fasteners from an angle

8-Point Impact Sockets

8-Point Impact Sockets

Quickly position on square fasteners

Wing Nut Impact Sockets

Wing Nut Impact Sockets

The slotted shape fits over wing nuts to tighten and loosen with more force than by hand

External Torx Impact Sockets

External Torx Impact Sockets

Tighten and loosen fasteners with an external Torx drive

Socket Sets

6-Point Socket Sets

6-Point Socket Sets

Made in the U.S.A., these tools handle the toughest industrial applications

Economy 6-Point Socket Sets

Economy 6-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported

External Torx-Plus Socket Sets

External Torx-Plus Socket Sets

Securely grip external Torx-Plus fasteners at high torque

12-Point Socket Sets

12-Point Socket Sets

Made in the U.S.A., 12 points quickly grip hex fasteners in the toughest industrial applications

Economy 12-Point Socket Sets

Economy 12-Point Socket Sets

Suitable for occasional maintenance work, these are imported; 12 points quickly grip hex fasteners

Open-End 6-Point Socket Sets

Open-End 6-Point Socket Sets

A cutout and extra length help you reach and twist nuts without having to disconnect your line

8-Point Socket Sets

8-Point Socket Sets

Grab onto square-drive screws and nuts more quickly than with 4-point sockets

6-Point Flex Socket Sets

6-Point Flex Socket Sets

Access 6-point nuts and bolts in tight and awkward spaces

12-Point Flex Socket Sets

12-Point Flex Socket Sets

Pivot the head to access fasteners from an angle

Fastener-Holding 6-Point Socket Sets

Fastener-Holding 6-Point Socket Sets

Keep nuts and bolts in place as you turn them using two spring-loaded balls

Electrically Insulating 12-Point Socket Sets

Electrically Insulating 12-Point Socket Sets

Organize what you need when working around live electrical circuits

Threaded Rod Sockets

Threaded Rod Sockets

Threaded Rod Sockets

Grip threaded rod for quick installation and removal without damaging the threads

Continuous-Duty Sockets

Continuous-Duty 6-Point Sockets

Continuous-Duty 6-Point Sockets

Use in high-volume jobs when you need hardened steel to resist cracking and wear

Continuous-Duty Fastener-Holding 6-Point Sockets

Continuous-Duty Fastener-Holding 6-Point Sockets

A magnet holds the fastener securely enough to drive self-tapping screws

Spark Plug Sockets

Spark Plug Sockets

Spark Plug Sockets

A rubber insert grips the plug to prevent damage

Flex Spark Plug Sockets

Flex Spark Plug Sockets

Pivot the head to access fasteners from an angle

Impact Socket Sets

6-Point Impact Socket Sets

6-Point Impact Socket Sets

The hex shape grips hex fasteners and prevents rounding

External Torx Impact Socket Sets

External Torx Impact Socket Sets

Tighten and loosen fasteners with an external Torx drive

6-Point Flex Impact Socket Sets

6-Point Flex Impact Socket Sets

Pivot the head to access fasteners from an angle

Other Products

Bit Sockets

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

Socket Adapters

Socket Adapters

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

Wrench Heads

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

Ratchet Wrenches

Ratchet Wrenches

Adjust fasteners in tight spaces without removing and repositioning the wrench

Socket Extensions

Socket Extensions

Lengthen sockets to turn hard-to-reach fasteners

Ratchet Wrench/Screwdrivers

Ratchet Wrench/Screwdrivers

Switch between sockets and bits to turn a variety of fasteners with a single tool

Impact Drivers

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

Socket Retaining Rings

Socket Retaining Rings

Secure sockets and adapters to impact tools

Screw, Pipe, and Stud Extractors

Screw, Pipe, and Stud Extractors

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

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Wrench Handles

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

Oil Filter Sockets

Oil Filter Sockets

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

Socket Organizers

Socket Organizers

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

Bit Adapters

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

Impact Wrenches

Impact Wrenches

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

Socket Drivers

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

Speeder Handles

Speeder Handles

Crank the handle to fasten nuts and bolts quickly

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