Aluminum Couplings | McMaster-Carr

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Zinc Yellow-Chromate Plated

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7,005 Products

Power Transmission

Shaft Couplings

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

1,098 products

Bore Reducers

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

6 products

Shaft Collars

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

495 products

Rod Alignment Couplers

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

7 products

Rod Ends

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

16 products

Torque Limiters

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

5 products

Lead Screws and Nuts

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

3 products

Fluid Handling

Pipe Fittings

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

682 products

Pipe Nipples and Pipe

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

619 products

Pipe Flanges

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

54 products

Hose Fittings

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

818 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

58 products

Hose Fitting Nuts

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

4 products

Tube Fittings

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

278 products

Tube Fitting Clamps

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

26 products

Tube Fitting Rings

Prevent leaks at tubing connection points

23 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

8 products

Tube Fitting Sleeves

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

7 products

Tube End Plugs

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

6 products

Pipe Repair Clamps

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

188 products

On-Off Valves

Start and stop flow through a line

1 product

Fastening and Joining

Standoffs

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

1,131 products

Thread Adapters

Join threads of a different type, size, and gender

699 products

Coupling Nuts

Connect and extend threaded rods

21 products

Electrical

Conduit-to-Conduit Connectors

Join pieces of conduit

33 products

Conduit

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

26 products

Conduit Box Connectors

Attach conduit to a knockout in electrical boxes

14 products

Building and Machinery Hardware

Slip-On Framing and Fittings

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

243 products

Press-Fit Framing and Fittings

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

44 products

Clamp-On Framing and Fittings

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

84 products

Flush-Fit Framing Rail Ends

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

3 products

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

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

27 products

Communication

Tag Rings

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

2 products

Material Handling

Hitch Pins

Secure hitch inserts to hitch receivers for towing

2 products

Hitch-Ball Coupler Locks

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

1 product