3/8" Square Drive Ratchets | McMaster-Carr

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System of Measurement

Square Drive Size

Head Shape

Head Style

Overall Length

31/32" to 3 1/16"

Finish

Magnesium Phosphate Coated

Manganese Phosphate Coated

Phosphate Coated

Drive Size

Wrench Style

Turn Required to Ratchet

Length

31/32" to 3 1/16"

Material

Stainless Steel

Bolt Clearance Type

Power Source

Drive Style

External 12-Point

External Pentagon

External Square

External Torx Plus

Tamper-Resistant Hex

Tamper-Resistant Torx

Tamper-Resistant Torx Plus

Sold As

Socket Shape

Socket Retainer Style

Number of Heads

Wrench Grade

Wrench Opening Shape

12-Point Sure Grip

Ratcheting

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

REACH

Export Control Classification Number (ECCN)

RoHS

DFARS Specialty Metals

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1,373 Products

Ratchet Wrenches

Ratchet Wrenches

Ratchet Wrenches

Turn fasteners without removing and repositioning the wrench

Sealed-Head Ratchet Wrenches

Sealed-Head Ratchet Wrenches

A gasket seals lubrication in and keeps dirt, dust, and moisture out

Quick-Release Ratchet Wrenches

Quick-Release Ratchet Wrenches

Push a button to release the socket from the wrench

Flex-Head Ratchet Wrenches

Flex-Head Ratchet Wrenches

The head pivots 180° to reach fasteners in tight spots

Sealed-Head Quick-Release Ratchet Wrenches

Sealed-Head Quick-Release Ratchet Wrenches

A gasket protects against debris and a button releases the socket

Fold-Up Ratchet Wrenches

Fold-Up Ratchet Wrenches

Bend the handle to reach over obstructions or fold to create a palm ratchet

Quick-Release Flex-Head Ratchet Wrenches

Quick-Release Flex-Head Ratchet Wrenches

The head pivots to reach tight spots and a button releases the socket

Quick-Release Fold-Up Ratchet Wrenches

Quick-Release Fold-Up Ratchet Wrenches

The convenience of quick socket changes with the versatility of a folding wrench

Adjustable-Length Ratchet Wrenches

Adjustable-Length Ratchet Wrenches

The shaft extends and locks for further reach

Air-Powered Ratchet Wrenches

Air-Powered Ratchet Wrenches

Run on air to turn fasteners quicker than manual ratchet wrenches

Cordless Ratchet Wrenches

Cordless Ratchet Wrenches

The motor stops when the fastener is tight

Sealed Flex-Head Ratchet Wrenches

Sealed Flex-Head Ratchet Wrenches

The head pivots to access tight places and the gasket keeps out debris

Fingertip Ratchet Wrenches

Fingertip Ratchet Wrenches

Feel resistance in your fingers to prevent overtightening

Tight-Clearance Ratchet Wrenches

Tight-Clearance Ratchet Wrenches

Rollers silently engage the ratchet to work in the tightest of spaces

Sealed-Head Ratchet Wrenches with Tether Ring

Sealed-Head Ratchet Wrenches with Tether Ring

Hook to a carabiner or lanyard to prevent drops

Foreign Object Damage (FOD) Prevention Ratchet Wrenches

Foreign Object Damage (FOD) Prevention Ratchet Wrenches

There are no internal screws or small parts that can fall into equipment

Adjustable-Length Quick-Release Ratchet Wrenches

Adjustable-Length Quick-Release Ratchet Wrenches

Extend the length and lock in place at set increments for more reach

Dual-Size Ratchet Wrenches

Dual-Size Ratchet Wrenches

Flip between 1/4″ and 3/8″ drive-size sockets without switching out your wrench

Sealed Offset Flex-Head Ratchet Wrenches

Sealed Offset Flex-Head Ratchet Wrenches

Reach over obstructions and keep debris out of the ratchet head

Swivel-Head Ratchet Wrenches

Swivel-Head Ratchet Wrenches

The head swivels for more flexibility than flex-head ratchets

Tapered-Handle Ratchet Wrenches

Tapered-Handle Ratchet Wrenches

Line up holes to insert bolts, then flip the wrench around to tighten

Adjustable-Length Quick-Release Flex-Head Ratchet Wrenches

Adjustable-Length Quick-Release Flex-Head Ratchet Wrenches

Pivot the head and extend the handle to reach fasteners in challenging spots

Sealed-Head Air-Powered Ratchet Wrenches

Sealed-Head Air-Powered Ratchet Wrenches

The enclosed steel head seals lubrication in and keeps dirt, dust, and moisture out

Electrically Insulating Ratchet Wrenches

Electrically Insulating Ratchet Wrenches

Protect against accidental contact with live electrical circuits

Adjustable-Length Flex-Head Ratchet Wrenches

Adjustable-Length Flex-Head Ratchet Wrenches

The handle extends and the head pivots to access fasteners in hard-to-reach spots

Offset Flex-Head Ratchet Wrenches

Offset Flex-Head Ratchet Wrenches

Offset Flex-Head Ratchet Wrenches

Twist-Handle Ratchet Wrenches

Twist-Handle Ratchet Wrenches

Rotate the grip to tighten a socket

Other Products

Ratchet Wrench/Screwdrivers

Ratchet Wrench/Screwdrivers

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

Sockets

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

Socket Adapters

Socket Adapters

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

Bit Sockets

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

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

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

Wrench Heads

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

Oil Filter Sockets

Oil Filter Sockets

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

Bit Adapters

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

Speeder Handles

Speeder Handles

Crank the handle to fasten nuts and bolts quickly

Socket Drivers

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

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

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