Steel Couplings | McMaster-Carr

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36,741 Products

Most Likely Products

Pipe Fittings

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

6,691 products

Shaft Couplings

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

1,233 products

Pipe Nipples and Pipe

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

4,821 products

Hose Fittings

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

2,633 products

All Results

Fluid Handling

Pipe Fittings

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

6,691 products

Pipe Nipples and Pipe

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

4,821 products

Pipe Flanges

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

905 products

Pipe Plugs

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

57 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

65 products

Pipe Collars

Clamp pipe passing through floors and walls

24 products

Pipe Fitting Clamps

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

4 products

Expansion Joints

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

15 products

Hose Fittings

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

2,633 products

Hose Fitting Nuts

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

4 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

23 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

4,961 products

Tube Fitting Clamps

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

107 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

66 products

Tube Fitting Sleeves

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

65 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

20 products

Tube End Plugs

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

8 products

Tube Fitting Sleeve and Nut Kits

Everything you need to create a tight seal between a metal tube and a Yor-Lok fitting

16 products

Pipe Repair Clamps

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

242 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

1 product

Orifice Valves

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

24 products

Flow-Adjustment Valves

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

2 products

Float Valve Bodies

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

10 products

Power Transmission

Shaft Couplings

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

1,233 products

U-Joints

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

156 products

Shaft Adapters

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

54 products

Machinable Shaft Ends

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

56 products

Bore Reducers

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

25 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

1,508 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

Shaft Collars

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

2,155 products

Rod Alignment Couplers

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

51 products

Hydraulic Cylinder Mounts

Restrain cylinders and secure loads to the end of the rod

4 products

Lead Screws and Nuts

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

169 products

Clutches

Start and stop the transmission of power to machinery

50 products

Torque Limiters

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

24 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

542 products

Thread Adapters

Join threads of a different type, size, and gender

2,872 products

Standoffs

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

2,586 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

95 products

Socket Adapters

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

207 products

Brazing Rings

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

3 products

Electrical

Conduit-to-Conduit Connectors

Join pieces of conduit

92 products

Conduit Box Connectors

Attach conduit to a knockout in electrical boxes

150 products

Conduit

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

183 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

4 products

Material Handling

Shackles

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

290 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

60 products

Ring Links

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

43 products

Tow Eyes

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

6 products

Drawbar Couplers

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

12 products

Hitch Inserts

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

19 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

3 products

Hitch Pins

Secure hitch inserts to hitch receivers for towing

2 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

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

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

1,070 products

Diffuser Collars

Connect diffusers to duct

4 products

Building and Machinery Hardware

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

52 products

Slip-On Framing and Fittings

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

22 products

Press-Fit Framing and Fittings

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

9 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

67 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

Lubricating

Grease Gun Nozzles

Replace nozzles on grease guns

17 products

Grease Gun Filler Pump Dispensing Tips

Switch out dispensing tips on grease gun filler pumps

2 products

Grease Gun Couplers

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

2 products

Grease Fitting Adapters

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

29 products

Communication

Tag Rings

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

56 products

Containers, Storage, and Furniture

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products