Straight Couplings | McMaster-Carr

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32,703 Products

Fluid Handling

Pipe Fittings

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

7,521 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

961 products

Expansion Joints

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

159 products

Pipe Fitting Clamps

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

20 products

Pipe Bushings

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

12 products

Hose Fittings

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

5,456 products

Hose Fitting Nuts

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

59 products

Tube Fittings

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

7,856 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

344 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

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

1 product

Hose Kink Absorbers

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

1 product

Orifice Valves

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

24 products

On-Off Valves

Start and stop flow through a line

12 products

Electrical

Conduit-to-Conduit Connectors

Join pieces of conduit

205 products

Conduit Box Connectors

Attach conduit to a knockout in electrical boxes

298 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

193 products

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

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

583 products

Diffuser Collars

Connect diffusers to duct

4 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 Fitting Adapters

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

27 products

Fastening and Joining

Brazing Rings

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

8 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