Couplings | McMaster-Carr

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83,255 Products

Most Likely Products

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

23,540 products

Flexible Shaft Couplings

Connect two shafts that are misaligned to transfer rotary motion from one to the other

1,632 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

6,015 products

All Results

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

23,540 products

Pipe Expansion Joints

Reduce stress, vibration, and noise in piping systems by absorbing movement

197 products

Rotary Joints

Transfer air, water, oil, and steam from supply lines to continuously revolving drums and rollers

102 products

Pipe Collars

Clamp pipe passing through floors and walls

24 products

Pipe Stub Ends

Connect a pipe flange to a pipe without needing to weld it in place

154 products

Pipe Traps

Create a seal that prevents the backflow of gas

59 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

6,015 products

Hose Fitting Nuts

Connect fittings and compressed-gas nipples to pressure regulators and torches

59 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

155 products

Hose End Plugs

Insert into the ends of hose to keep out dirt and debris

41 products

Hose Fitting Retaining Chains

Ensure hose end caps and plugs stay connected to the line

2 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

17,552 products

Tube Repair Clamps

Mend small holes, cracks, and full-circle breaks in tubing without dismantling your system

18 products

Pipe Repair Clamps

Fix small holes and cracks in pipe without taking your system apart

244 products

Air Chucks

Connect air hose to Schrader valves, which are common on tires and hydraulic systems

28 products

Duct Hose

Connect to blowers and vacuums to move air, fumes, dust, chips, and liquid

12 products

Hose Kink Absorbers

Prevent hose from kinking to ensure maximum flow and extend hose life

6 products

Manual On/Off Valves

Start and stop flow through a line

3,215 products

Orifice Valves

Restrict the flow of liquids and gases to precisely control rate and pressure

989 products

Valve Union Fittings

Mating parts join valves to a line for quick connection and removal

35 products

Float Valve Bodies

Pair with floats and rods to create float valves that meet your needs

77 products

Flow-Adjustment Valves

Gradually open and close to control the volume of air and liquids through a line

2 products

Solenoid On/Off Valves

A solenoid withstands rapid cycling for applications with frequent opening and closing

562 products

Sampling Valves

Drain a small amount of liquid or gas for inspection without disrupting flow

10 products

Air-Actuated On/Off Valves

Operate on compressed air to start and stop flow faster than motor-driven valves

224 products

Liquid-Dispensing Metering Valves

Program to dispense a specific amount of liquid every time and shut off when set amount is reached

3 products

Motor-Actuated On/Off Valves

An electric motor handles higher flow rates and pressures than solenoid valves

85 products

Power Transmission

Flexible Shaft Couplings

Connect two shafts that are misaligned to transfer rotary motion from one to the other

1,632 products

Rigid Shaft Couplings

Join two shafts that are aligned and handle higher torque than flexible shaft couplings

696 products

Shaft Adapters

Increase or reduce your shaft's diameter to fit equipment, or replace damaged shaft ends

54 products

U-Joints

Transfer torque between shafts at an angle; handle more torque and misalignment than flexible shafts

181 products

Bore Reducers

Adapt the bore of a component to a smaller size for mounting on a shaft

31 products

Machinable Shaft Ends

Mill custom pulleys, threaded hubs, sprockets, collars, and sensor targets and mount them to shafts

56 products

Rigid Shaft Coupling Covers

Shield rigid shaft couplings from dirt, water, and lubricants to extend their life

13 products

Flexible Shafts

Snake around curves and obstructions to transmit rotary motion along any path

41 products

Shaft Collars

Hold and position parts on a shaft, or limit shaft movement

2,723 products

Rod Alignment Couplers

Reduce wear on bearings and seals by flexing when the cylinder and load aren't precisely even

94 products

Hydraulic Cylinder Mounts

Restrain cylinders and secure loads to the end of the rod

4 products

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

1,613 products

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

808 products

Rod End Seals

Keep dirt out and lubrication in to extend the life of rod ends

16 products

Rod End Nuts

Attach to rods, pipe, and tubing to make pivot and hinge points

8 products

Rod End Inserts

Attach to rod ends to increase the amount of misalignment they can handle

29 products

Lead Screw Nuts

Mate with lead screws to move components in a straight line

335 products

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

434 products

Torque Limiters

Keep torque at or below a set limit to control tension or braking or protect machinery from overload

127 products

Clutches

Start and stop the transmission of power to machinery

58 products

Brakes

Control how much and how quickly your drive system slows down

7 products

Bearing Adapter Sleeves

Close gaps between your bearing and shaft for a tight fit

29 products

Roller Chain Links

Join chain lengths together

446 products

Pulley and Sprocket Bushings

Mount between a rotating shaft and equipment to secure the shaft and reduce vibration

79 products

Chain and Belt Torque Limiters

Prevent chain or belt damage from overloading; loads above the set torque trigger a stop

109 products

V-Belt Connectors

Join ends of adjustable-length V-belting

4 products

Inverted-Tooth Chain Pins

Replace the pins in your inverted-tooth chain or link two chains together

6 products

Round Belt Connectors

Fasten the ends of round belts together

27 products

Shaft Collar Adapters

Sized specifically to adapt standard shaft collars to pipe, creating a tight fit

12 products

Linear Drive Nuts

Create a linear positioning system on a rotary shaft without a lead screw

3 products

Fastening and Joining

Coupling Nuts

Connect and extend threaded rods

620 products

Thread Adapters

Join threads of a different type, size, and gender

3,611 products

Standoffs

Separate, position, or connect components in assemblies

5,255 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

99 products

Threaded Rod Collars

Hold and position parts on a threaded rod

76 products

Connectors for Telescoping Tubes

Lock tubes in place to create adjustable structures, such as folding stands and extension poles

15 products

Socket Adapters

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

210 products

Driver Extension Adapters

Create a tool that’s as long as you need to reach deeply recessed fasteners

44 products

Brazing Rings

Snap into unthreaded pipe fittings for an extra-strong, leak-resistant connection

5 products

Electrical Power, Networking, and Controlling

Conduit and Fittings

Protect wiring from impact and the environment in runs indoors, outdoors, and underground

1,352 products

Electrical Enclosure Panel Mounts

Add a secondary panel that swings to mount more components in your enclosure

2 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

85 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

1,672 products

Coaxial Connectors

Plugs, sockets, receptacles, and adapters to make coaxial connections

59 products

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

333 products

USB Connectors

Plugs, sockets, receptacles, and adapters to make USB connections

76 products

HDMI Adapters

Convert one HDMI size or style to another

14 products

Fiber-Optic Connectors

Join fiber-optic cords that have the same gender and connection type

10 products

D-Sub Connectors

Plugs, sockets, receptacles, and adapters for connecting computers, monitors, and printers

145 products

Mini Connectors

Plugs, sockets, and receptacles send power and control signals to equipment and automated systems

78 products

Solenoid Valve Connectors

Sockets and receptacles to connect solenoid components, such as valves and motors

17 products

DisplayPort Connectors

Connect two DisplayPort cords of the same gender and connection type

1 product

Audio Connectors

Plugs, sockets, receptacles, and adapters to make audio connections

27 products

Video Adapters

Convert from one video connection to another

7 products

USB Cords

Transfer data between computers, printers, and mobile devices

260 products

Video Adapter Cords

Send video between devices with different connections

8 products

USB Chargers

Power up mobile devices and other electronics

27 products

USB Extenders

Increase the reach of USB devices with a transmitter and receiver

3 products

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

5 products

Material Handling

Tow Eyes

Mount to trailers and connect to tow hooks or drawbar couplers on vehicles for towing

14 products

Trailer Couplers

Push trailer-mounted rings into vehicle-mounted jaws for towing

2 products

Hitch-Ball Couplers

Bolt or weld to trailers and connect to hitch balls on vehicles for towing

11 products

Hitch Inserts

Fit into hitch receivers and secure with a hitch pin to create a connection for towing

32 products

Hitch-Ball Coupler Locks

Insert into the hitch-ball coupler latch or socket on your trailer to prevent theft

4 products

Hitch Balls

Mount to hitch inserts and use with hitch receivers and couplers to tow trailers

9 products

Hitch Receivers

Use with hitch inserts and pins to create a complete hitch for towing

2 products

Hitch Pins

Secure hitch inserts to hitch receivers for towing

12 products

Hitch Kits

Everything you need to attach a hitch to your vehicle’s receiver

2 products

Drawbar Couplers

Use with drawbar rings to connect trailers to vehicles; also known as pintle hitches

17 products

Hydraulic Jack Hose and Fittings

Convey hydraulic fluid between hydraulic jacks and their power source

21 products

Forklift Hitch Receivers

Secure to forklift forks and slide in a hitch to adapt a forklift for towing

2 products

Tow Hooks

Bolt to vehicles and connect to tow eyes on trailers for towing

9 products

Kingpins

Bolt or weld to a semi-trailer to connect it to your tractor

6 products

Shackles

Lift, pull, and anchor heavy loads while keeping them secure with a pin

307 products

Chain Connecting Links

Attach fittings to lift components or bind, tie down, and pull items

51 products

Quick Links

Join rope, cable, and chain to secure loads

116 products

Swivels

Rotate loads to keep rope and chain from twisting and knotting

70 products

Chain Rings

Join chains and add connectors for binding, towing, and lifting

135 products

Ring Links

Bend, hammer, or twist closed to connect chain links and attach fittings

47 products

E-Track Couplings

Connect the ends of E-Track straps

1 product

Webbing Rings

Add looped connection spots

50 products

Scaffold Clamps

Construct scaffolding and secure supports, such as railings

2 products

Conveyor T-Slot Bolts

Drop into the T-slot to mount components

12 products

Measuring and Inspecting

Hose Coupling Size-Identification Kits

Match your hose coupling to one of the plugs to determine its size without measuring

1 product

Heating, Ventilation, and Air Conditioning

Duct and Fittings

Circulate air through HVAC systems using round, rectangular, and fabric duct

1,044 products

Duct Airflow Dampers

Regulate airflow to sections of duct

99 products

Diffuser Collars

Connect diffusers to duct

4 products

Duct Damper Handles

Replace an existing handle or pair with a blade to create your own damper

1 product

Duct Turning Vanes

Guide air smoothly around sharp bends in rectangular duct

4 products

Barometric Draft Dampers

Maintain consistent airflow in your furnace to improve its performance

6 products

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system

3 products

Duct Fire Dampers

Automatically close at high temperatures to help prevent the spread of fire through duct

13 products

Duct Downdraft Diverters

Prevent downdrafts from blowing back into ductwork while allowing air and fumes to vent

8 products

Diffuser Dampers

Regulate the airflow coming out of drop-ceiling diffusers

10 products

Temperature-Controlled Outlet Adapters

Automatically turn heating and cooling devices on and off as temperatures rise and fall

3 products

Lubricating

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

41 products

Grease Gun Tips

Attach to grease gun nozzles and direct a stream of lubricant into grease fittings on machinery

63 products

Grease Gun Tip Adapters

Quickly switch between standard, button-head, and flush-style grease fittings

16 products

Grease Gun Nozzles

Replace nozzles on grease guns

103 products

Grease Gun Couplers

Extend the dispensing tip on grease guns to lubricate angled and hard-to-reach areas

6 products

Grease Gun Filler Pump Dispensing Tips

Switch out dispensing tips on grease gun filler pumps

2 products

Grease Gun Accessory Kits

Adapt and extend dispensing tips and install grease fittings with an assortment of tools

2 products

Building and Machinery Hardware

Slip-On Framing and Fittings

Insert rails into fittings and tighten screws to make guards, railings, and racks

434 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

181 products

Flush-Fit Framing Rail Ends

Secure flush-fit framing structures to floors, walls, and ceilings

3 products

T-Slotted Framing Fasteners

Secure brackets and other accessories to T-slotted rails

265 products

Press-Fit Framing and Fittings

Set up temporary partitions, guards, and displays using only a hammer

88 products

Locking-Slotted Framing and Fittings

Make platforms, bases, and other structures that stand up to more movement than T-slotted framing

10 products

Joint Covers

Shield rotating joints to keep lubricants in and contaminants out

25 products

Hinges

Mount to doors and panels so they can swing open and closed

1,590 products

Mechanical Control Cables

Weave around obstructions to operate valves, throttles, and other machinery from a distance

97 products

Safety Equipment

Fire Hose Fittings

Mount your fire hose to hydrants and washdown equipment, or join lengths of hose

86 products

Chain Barrier Links

Split in half and snap back together to securely connect lengths of chain

6 products

Facility and Grounds Maintenance

Faucet Spout Thread Adapters

Connect the female end of your garden hose to a faucet spout

4 products

Air Admittance Valves

Allow air into drain, waste, and vent systems so you don't have to vent plumbing to the outdoors

2 products

Garden Hose Valves

Start and stop the flow of water through your garden hose

30 products

Containers, Storage, and Furniture

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Communication

Tag Rings

Loop onto tags to attach them to lanyards, key rings, and other objects

73 products