Straight Couplings | McMaster-Carr

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Export Control Classification Number (ECCN)

39,618 Products

Fluid Handling

Pipe and Pipe Fittings

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

16,042 products

Tube Fittings

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

8,595 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

354 products

Tube Fitting Clamps

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

144 products

Tube Fitting Sleeves

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

313 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

5,448 products

Hose Fitting Nuts

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

60 products

Tube Repair Clamps

Mend small holes, cracks, and full-circle breaks in tubing without dismantling your system

18 products

Pipe Repair Clamps

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

244 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

On-Off Valves

Start and stop flow through a line

3,616 products

Orifice Valves

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

24 products

Electrical Power, Networking, and Controlling

Conduit Straights

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

566 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

43 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

82 products

Power Connectors

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

1,413 products

Coaxial Adapters

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

21 products

Coaxial Plugs

Pair with sockets or receptacles to make coaxial connections

26 products

Coaxial Receptacles

Install in walls and panels and pair with plugs to make coaxial connections

1 product

Coaxial Sockets

Pair with plugs to make coaxial connections

7 products

Metric Circular Connectors

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

270 products

Fiber-Optic Connectors

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

10 products

HDMI Adapters

Convert one HDMI size or style to another

13 products

USB Connectors

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

63 products

Audio Connectors

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

20 products

Mini Connectors

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

73 products

D-Sub Connectors

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

107 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

Solenoid Valve Receptacles

Pair with plugs or sockets to connect solenoid components

6 products

Video Adapter Cords

Send video between devices with different connections

3 products

USB Cords

Transfer data between computers, printers, and mobile devices

2 products

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

5 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

Heating, Ventilation, and Air Conditioning

Duct and Fittings

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

505 products

Duct Airflow Dampers

Regulate airflow to sections of duct

90 products

Diffuser Collars

Connect diffusers to duct

4 products

Barometric Draft Dampers

Maintain consistent airflow in your furnace to improve its performance

6 products

Duct Turning Vanes

Guide air smoothly around sharp bends in rectangular duct

4 products

Duct Downdraft Diverters

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

8 products

Duct Fire Dampers

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

13 products

Lubricating

Grease Fitting Adapters

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

27 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

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

Power Transmission

Shaft Collar Adapters

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

12 products