Couplings | McMaster-Carr

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68,427 Products

Most Likely Products

Pipe Fittings

Form threaded, barbed, flanged, and other types of connections between lengths of pipe

12,695 products

Shaft Couplings

Connect two shafts to transfer rotary motion from one to the other

2,123 products

Tube Fittings

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

14,511 products

Hose Fittings

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

6,111 products

Pipe Nipples and Pipe

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

7,400 products

All Results

Fluid Handling

Pipe Fittings

Form threaded, barbed, flanged, and other types of connections between lengths of pipe

12,695 products

Pipe Nipples and Pipe

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

7,400 products

Pipe Flanges

Create an access point in a line by bolting two same-size flanges together with a gasket

1,173 products

Expansion Joints

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

159 products

Pipe Plugs

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

73 products

Pipe Fitting Clamps

Connect easy-access and grooved-end pipe fittings to pipe

20 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

67 products

Pipe Collars

Clamp pipe passing through floors and walls

24 products

Pipe Bushings

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

12 products

Tube Fittings

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

14,511 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

353 products

Tube Fitting Clamps

Quickly secure connections between tube fittings, including sanitary and high-vacuum fittings

145 products

Tube Fitting Sleeves

Pair with nuts and fittings to form a secure connection on tubing

300 products

Tube Supports

Slip into plastic and rubber tubing to prevent them from collapsing

60 products

Tube Fitting Rings

Prevent leaks at tubing connection points

33 products

Tube End Plugs

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

35 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

39 products

Hose Fittings

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

6,111 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

38 products

Hose Fitting Retaining Chains

Ensure hose end caps and plugs stay connected to the line

2 products

Pipe Repair Clamps

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

244 products

Tube Repair Clamps

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

18 products

Air Chucks

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

18 products

Duct Hose and Fittings

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

12 products

Hose Kink Absorbers

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

6 products

Orifice Valves

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

102 products

Float Valve Bodies

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

36 products

On-Off Valves

Start and stop flow through a line

24 products

Flow-Adjustment Valves

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

2 products

Power Transmission

Shaft Couplings

Connect two shafts to transfer rotary motion from one to the other

2,123 products

U-Joints

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

174 products

Shaft Adapters

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

54 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

Shear Couplings

Sever the connection between shafts when there's too much torque to protect parts from breaking

22 products

Flexible Shafts

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

41 products

Rod Ends

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

1,646 products

Rod End Seals

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

16 products

Rod End Inserts

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

29 products

Rod End Nuts

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

8 products

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

725 products

Shaft Collars

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

2,803 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

Torque Limiters

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

112 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

Chain and Belt Torque Limiters

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

80 products

Bearing Adapter Sleeves

Close gaps between your bearing and shaft for a tight fit

29 products

Fastening and Joining

Coupling Nuts

Connect and extend threaded rods

620 products

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

5,265 products

Thread Adapters

Join threads of a different type, size, and gender

3,607 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

95 products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

2 products

Socket Adapters

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

208 products

Brazing Rings

Snap into metal pipe and tubing to form leak-resistant joints more quickly than with hand-fed alloys

11 products

Electrical

Conduit-to-Conduit Connectors

Join pieces of conduit

235 products

Conduit Box Connectors

Attach conduit to a knockout in electrical boxes

487 products

Conduit

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

287 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

292 products

Material Handling

Shackles

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

307 products

Chain Rings

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

149 products

Chain Connecting Links

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

51 products

Quick Links

Screw the nut closed to join lengths of chain and add connectors

116 products

Swivels

Rotate loads to keep rope and chain from twisting and knotting

70 products

Ring Links

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

47 products

Tow Eyes

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

6 products

Hitch-Ball Couplers

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

6 products

Hitch Inserts

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

19 products

Hitch Balls

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

9 products

Hitch Pins

Secure hitch inserts to hitch receivers for towing

5 products

Hitch Receivers

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

2 products

Hitch-Ball Coupler Locks

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

4 products

Drawbar Couplers

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

12 products

Trailer Couplers

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

2 products

Tow Hooks

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

1 product

Forklift Hitch Receivers

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

1 product

Building and Machinery Hardware

Slip-On Framing and Fittings

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

433 products

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

277 products

Clamp-On Framing and Fittings

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

171 products

Press-Fit Framing and Fittings

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

88 products

Flush-Fit Framing Rail Ends

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

3 products

Locking-Slotted Framing and Fittings

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

3 products

Control Cables

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

84 products

Joint Covers

Shield rotating joints to keep lubricants in and contaminants out

24 products

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

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

1,052 products

Diffuser Collars

Connect diffusers to duct

4 products

Lubricating

Grease Gun Nozzles

Replace nozzles on grease guns

64 products

Grease Gun Tips

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

45 products

Grease Gun Tip Adapters

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

16 products

Grease Gun Accessory Kits

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

2 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 Fitting Adapters

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

41 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

Communication

Tag Rings

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

59 products

Containers, Storage, and Furniture

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

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

Safety Equipment

Chain Barrier Links

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

6 products