Plastic Couplings | McMaster-Carr

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20,269 Products

Most Likely Products

Pipe Fittings

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

Tube Fittings

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

Hose Fittings

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

Conduit-to-Conduit Connectors

Conduit-to-Conduit Connectors

Join pieces of conduit

All Results

Fluid Handling

Pipe Fittings

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

Pipe Nipples and Pipe

Pipe Nipples and Pipe

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

Expansion Joints

Expansion Joints

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

Pipe Flanges

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

Pipe Fitting Clamps

Pipe Fitting Clamps

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

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

Pipe Plugs

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

Pipe Bushings

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

Tube Fittings

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

Tube Supports

Slip into plastic and rubber tubing to prevent them from collapsing

Tube Fitting Nuts

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

Tube Fitting Sleeves

Tube Fitting Sleeves

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

Tube Fitting Clamps

Tube Fitting Clamps

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

Tube End Caps

Cover the ends of tube to keep out dirt and debris

Tube End Plugs

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

Hose Fittings

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

Hose End Caps

Cover the ends of hose to keep out dirt and debris

Hose End Plugs

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

Hose Fitting Nuts

Hose Fitting Nuts

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

Pipe Repair Clamps

Pipe Repair Clamps

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

Hose Kink Absorbers

Hose Kink Absorbers

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

Duct Hose and Fittings

Duct Hose and Fittings

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

Orifice Valves

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

On-Off Valves

Start and stop flow through a line

Valve Union Fittings

Valve Union Fittings

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

Float Valve Bodies

Float Valve Bodies

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

Electrical

Conduit-to-Conduit Connectors

Conduit-to-Conduit Connectors

Join pieces of conduit

Conduit Box Connectors

Conduit Box Connectors

Attach conduit to a knockout in electrical boxes

Conduit

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

Electrical Adapters

Electrical Adapters

Change electrical connectors to another type, size, or gender

Power Transmission

Shaft Couplings

Shaft Couplings

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

Flexible Shafts

Flexible Shafts

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

U-Joints

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

Rod Ends

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

Lead Screws and Nuts

Lead Screws and Nuts

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

Shaft Collars

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

Torque Limiters

Torque Limiters

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

Roller Chain Links

Roller Chain Links

Join chain lengths together

Round Belt Connectors

Round Belt Connectors

Fasten the ends of round belts together

Fastening and Joining

Standoffs

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

Coupling Nuts

Connect and extend threaded rods

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Building and Machinery Hardware

Clamp-On Framing and Fittings

Clamp-On Framing and Fittings

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

Slip-On Framing and Fittings

Slip-On Framing and Fittings

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

Press-Fit Framing and Fittings

Press-Fit Framing and Fittings

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

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

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

Control Cables

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

Hinges

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

Heating, Ventilation, and Air Conditioning

Duct and Fittings

Duct and Fittings

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

Duct Airflow Dampers

Duct Airflow Dampers

Regulate airflow to sections of duct

Material Handling

Shackles

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

Hitch Pins

Secure hitch inserts to hitch receivers for towing

Lubricating

Grease Gun Nozzles

Grease Gun Nozzles

Replace nozzles on grease guns

Grease Gun Tip Adapters

Grease Gun Tip Adapters

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

Facility and Grounds Maintenance

Air Admittance Valves

Air Admittance Valves

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

Safety Equipment

Chain Barrier Links

Chain Barrier Links

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

Communication

Tag Rings

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

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)