Plastic Couplings | McMaster-Carr

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Compressed Non-Asbestos Synthetic Fiber

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How can we improve?

26,111 Products

Fluid Handling

Pipe and Pipe Fittings

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

5,273 products

Tube Fittings

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

8,912 products

Tube Supports

Slip into plastic and rubber tubing to prevent them from collapsing

93 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

62 products

Tube Fitting Sleeves

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

55 products

Tube Fitting Clamps

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

11 products

Tube End Plugs

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

20 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

19 products

Hose Fittings

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

2,204 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

42 products

Hose End Plugs

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

25 products

Hose Fitting Nuts

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

6 products

Pipe Repair Clamps

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

195 products

Duct Hose and Fittings

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

4 products

Hose Kink Absorbers

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

6 products

On-Off Valves

Start and stop flow through a line

3,600 products

Valve Union Fittings

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

34 products

Orifice Valves

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

179 products

Float Valve Bodies

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

19 products

Electrical Power, Networking, and Controlling

Conduit Straights

Join conduit of different sizes and types, or attach conduit to a knockout in electrical boxes

151 products

Conduit Elbows

Join conduit with 45°, 90°, offset, and adjustable-angle connectors

114 products

Conduit

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

113 products

Conduit Grommets

Guard wiring from sharp edges at the ends of conduit

24 products

Conduit Bodies

Access wiring to pull, splice, or redirect it

24 products

Conduit Tees

Split or merge runs of plastic conduit

7 products

Conduit Locknuts

Secure threaded conduit fittings to knockouts in outlet boxes or enclosures

51 products

Conduit Wyes

Split or merge runs of conduit more gradually than tees

9 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

53 products

Power Connectors

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

1,189 products

HDMI Adapters

Convert one HDMI size or style to another

14 products

USB Connectors

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

59 products

Metric Circular Connectors

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

163 products

Fiber-Optic Connectors

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

7 products

Mini Connectors

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

73 products

Coaxial Adapters

Join coaxial cords that have the same gender or different connection types

6 products

DisplayPort Connectors

Connect two DisplayPort cords of the same gender and connection type

1 product

Video Adapters

Convert from one video connection to another

7 products

Audio Connectors

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

13 products

D-Sub Connectors

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

48 products

Solenoid Valve Connectors

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

17 products

USB Extenders

Increase the reach of USB devices with a transmitter and receiver

3 products

USB Cords

Transfer data between computers, printers, and mobile devices

63 products

Video Adapter Cords

Send video between devices with different connections

3 products

USB Chargers

Power up mobile devices and other electronics

2 products

Power Transmission

Shaft Couplings

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

42 products

Shaft Coupling Covers

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

13 products

U-Joints

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

7 products

Flexible Shafts

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

25 products

Shaft Collars

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

141 products

Shaft Collar Adapters

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

12 products

Precision Lead Screws and Nuts

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

208 products

Rod Ends

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

304 products

Torque Limiters

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

14 products

Roller Chain Links

Join chain lengths together

4 products

Round Belt Connectors

Fasten the ends of round belts together

4 products

Fastening and Joining

Standoffs

Separate, position, or connect components in assemblies

958 products

Coupling Nuts

Connect and extend threaded rods

14 products

Thread Adapters

Join threads of a different type, size, and gender

5 products

Heating, Ventilation, and Air Conditioning

Duct and Fittings

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

84 products

Duct Airflow Dampers

Regulate airflow to sections of duct

10 products

Temperature-Controlled Outlet Adapters

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

3 products

Building and Machinery Hardware

Mechanical Control Cables

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

88 products

Slip-On Framing and Fittings

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

24 products

Press-Fit Framing and Fittings

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

33 products

Clamp-On Framing and Fittings

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

35 products

T-Slotted Framing and Fittings

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

2 products

Hinges

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

171 products

Facility and Grounds Maintenance

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

Lubricating

Grease Gun Tip Adapters

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

1 product

Grease Gun Nozzles

Replace nozzles on grease guns

17 products

Material Handling

Webbing Rings

Add looped connection spots

3 products

Hitch Pins

Secure hitch inserts to hitch receivers for towing

4 products

Shackles

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

16 products

Communication

Tag Rings

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

1 product