Square Wrenches | McMaster-Carr

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4,907 Products

Most Likely Products

Sockets

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

Socket Wrenches

Socket Wrenches

Apply torque to turn nuts, bolts, and other fasteners without rounding the heads

Lathe Chuck Keys

Lathe Chuck Keys

A long T-handle gives leverage to open tight lathe chucks

Wrench Handles

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

Box Wrenches

Grip all sides of a fastener to prevent slipping

Open-End Wrenches

Open-End Wrenches

Tighten and loosen fasteners from the top or the side

All Results

Fastening and Joining

Sockets

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

Socket Wrenches

Socket Wrenches

Apply torque to turn nuts, bolts, and other fasteners without rounding the heads

Wrench Handles

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

Box Wrenches

Grip all sides of a fastener to prevent slipping

Open-End Wrenches

Open-End Wrenches

Tighten and loosen fasteners from the top or the side

Shut-Off Valve Wrenches

Shut-Off Valve Wrenches

Turn hard-to-reach valves on gas lines, faucets, toilets, and sinks

Bit Sockets

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

Fire Hose and Hydrant Wrenches

Fire Hose and Hydrant Wrenches

Open and close hydrant caps, install sprinkler heads, and fasten fire hose fittings

Ratchet Wrenches

Ratchet Wrenches

Adjust fasteners in tight spaces without removing and repositioning the wrench

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Combination Wrenches

Combination Wrenches

Use the open end when tightening in cramped spaces and the box end when you need extra grip

Socket Adapters

Socket Adapters

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

Socket Drivers

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

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

Ball Joint Sockets

Ball Joint Sockets

Install and remove ball joints in suspension and steering systems

Drain Wrenches

Install and remove drain traps and fittings, overflow outlets, and toilet inlet spuds

Valve Wheel Wrenches

Valve Wheel Wrenches

Supply the leverage needed to turn hand wheels on large valves

Spanner Wrenches

Spanner Wrenches

Grab onto holes and slots to turn collars, bearings, and other machine tool components

Strap Wrenches

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

Chain Wrenches

Grasp and twist pipe, tubing, and conduit, as well as irregularly shaped objects

Oil Filter Sockets

Oil Filter Sockets

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

Screwdrivers

Tighten and loosen screws

Speeder Handles

Speeder Handles

Crank the handle to fasten nuts and bolts quickly

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

Screw, Pipe, and Stud Extractors

Screw, Pipe, and Stud Extractors

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

Fabricating and Machining

Lathe Chuck Keys

Lathe Chuck Keys

A long T-handle gives leverage to open tight lathe chucks

Building and Machinery Hardware

Ratchet Handles

Ratchet Handles

Quickly adjust machine components and valves in tight spaces

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