Straight Couplings | McMaster-Carr

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Compressed Non-Asbestos Synthetic Fiber

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33,628 Products

Fluid Handling

Pipe and Pipe Fittings

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

16,059 products

Tube Fittings

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

8,612 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

357 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

316 products

Tube Supports

Slip into plastic and rubber tubing to prevent them from collapsing

93 products

Tube Fitting Rings

Prevent leaks at tubing connection points

33 products

Tube Fitting Sleeve and Nut Kits

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

31 products

Hose Fittings

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

5,475 products

Hose Fitting Nuts

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

59 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 hose from kinking to ensure maximum 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

10 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 Fittings

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

505 products

Duct Downdraft Diverters

Prevent downdrafts from blowing back into ductwork while allowing air and fumes to vent

8 products

Diffuser Collars

Connect diffusers to duct

4 products

Duct Turning Vanes

Guide air smoothly around sharp bends in rectangular duct

4 products

Barometric Draft Dampers

Maintain consistent airflow in your furnace to improve its performance

6 products

Duct Airflow Dampers

Regulate airflow to sections of duct

90 products

Duct Fire Dampers

Automatically close at high temperatures to help prevent the spread of fire through duct

13 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

Power Transmission

Shaft Collar Adapters

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

12 products