Mechanical Joints | McMaster-Carr

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37,936 Products

Most Likely Products

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

23,546 products

Flow-Adjustment Valves

Gradually open and close to control the volume of air and liquids through a line

71 products

Pipe Joiners

Connect heavy and difficult-to-position gasketed pipe without powered equipment

1 product

U-Joints

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

181 products

Rod Ends

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

1,613 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

1,653 products

All Results

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

23,546 products

Pipe Expansion Joints

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

197 products

Pipe Locknuts

Thread onto the male end of a pipe fitting so it won't loosen from vibration

120 products

Rotary Joints

Transfer air, water, oil, and steam from supply lines to continuously revolving drums and rollers

102 products

Pipe Collars

Clamp pipe passing through floors and walls

24 products

Pipe Traps

Create a seal that prevents the backflow of gas

59 products

Pipe Stub Ends

Connect a pipe flange to a pipe without needing to weld it in place

154 products

Pipe Joiners

Connect heavy and difficult-to-position gasketed pipe without powered equipment

1 product

Tube Fittings

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

144 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

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

24 products

Flow-Adjustment Valves

Gradually open and close to control the volume of air and liquids through a line

71 products

Manual On-Off Valves

Start and stop flow through a line

458 products

Drain Valves

Vent air or discharge liquids to remove excess fluid from your system

11 products

Air-Actuated On-Off Valves

Operate on compressed air to start and stop flow faster than motor-driven valves

8 products

Solenoid On-Off Valves

A solenoid withstands rapid cycling for applications with frequent opening and closing

2 products

Power Transmission

U-Joints

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

181 products

Shaft Adapters

Increase or reduce your shaft's diameter to fit equipment, or replace damaged shaft ends

54 products

Flexible Shafts

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

41 products

Rigid Shaft Couplings

Join two shafts that are aligned and handle higher torque than flexible shaft couplings

696 products

Machinable Shaft Ends

Mill custom pulleys, threaded hubs, sprockets, collars, and sensor targets and mount them to shafts

56 products

Bore Reducers

Adapt the bore of a component to a smaller size for mounting on a shaft

31 products

Flexible Shaft Couplings

Connect two shafts that are misaligned to transfer rotary motion from one to the other

1,632 products

Rod Ends

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

1,613 products

Rod End Nuts

Attach to rods, pipe, and tubing to make pivot and hinge points

8 products

Swivel Joints

Handle shaft misalignment where ball joint rod ends won’t fit; also known as spherical bearings

136 products

Pulley and Sprocket Bushings

Mount between a rotating shaft and equipment to secure the shaft and reduce vibration

79 products

Gas Spring End Fittings

Connect gas springs to mounting studs and brackets

73 products

Bearing Adapter Sleeves

Close gaps between your bearing and shaft for a tight fit

29 products

Torque Limiters

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

67 products

Air Flow Control Valves

Control the speed of air-powered equipment by adjusting the volume of airflow entering or exiting

199 products

Pivot Bearings

Best for applications that require small, precise oscillating motion with limited twisting

20 products

Building and Machinery Hardware

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

1,653 products

T-Slotted Framing and Fittings

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

860 products

Flush-Fit Framing and Fittings

Create smooth stair and platform railings by sliding fittings into rails and tightening the screws

10 products

Connectors for Telescoping Tubes

Lock tubes in place to create adjustable structures, such as folding stands and extension poles

15 products

Clamp-On Framing and Fittings

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

202 products

Locking-Slotted Framing Brackets

Connect locking-slotted rails and reinforce joints to build strong platforms and machine bases

6 products

Press-Fit Framing and Fittings

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

38 products

Slip-On Framing and Fittings

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

374 products

Prop Rods

Prop hood, trunk, and other lids open at a variety of angles

1 product

Positioning Arms

Mount and position tools and other small equipment

191 products

Hinges

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

1,590 products

Lid Supports

Keep lids on cabinets, hatches, and chests open and then close them smoothly or softly

61 products

Positioning Arm Mounts

Add a mounting surface to positioning arms

4 products

Monitor Mounts

Mount monitors to walls, benches, ceilings, and other surfaces

18 products

Torque-Absorbing Arms

Built to handle the torque of small power tools so you don’t have to

5 products

Tablet, Laptop, and Mobile Device Mounts

Hold and position your electronic devices so they're in sight and within reach

24 products

Door Installation Kits

Complete your door installation with a handle or knob, strike plate, and hinges

12 products

Brackets

Connect surfaces in an assembly

351 products

Mechanical Control Cables

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

97 products

Hasps

Swing the arm over the strike plate and secure with a padlock or key to lock doors and containers

94 products

Padlockable Eyes

Mount to a door and its frame and secure with a padlock to keep doors closed

4 products

Hasp Strike Plates

Receive the arm of your hasp and secure with a padlock to lock doors and containers

12 products

Door Track Brackets

Connect door track to ceilings, walls, and adjacent sections of track

38 products

Lubricating

Coolant Nozzle and Hose Adapters

Connect threaded coolant nozzles and hose to coolant supply ports on equipment such as CNC machines

4 products

Coolant Hose and Fittings

Build a custom system to deliver coolant, cutting oil, water, or air in any direction

207 products

Fastening and Joining

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

3 products

Weld Nuts

Weld to metal surfaces to add permanent threads

12 products

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

163 products

Socket Adapters

Make your socket more versatile, from converting the drive to limiting torque

34 products

Wood Joiners

Connect and repair wood pieces and joints

9 products

Socket Extensions

Lengthen sockets to turn hard-to-reach fasteners

7 products

Bit Sockets

Turn fasteners with an internal drive style without slipping and damaging the drive

12 products

Driver Extension Adapters

Create a tool that’s as long as you need to reach deeply recessed fasteners

44 products

Electrical Power, Networking, and Controlling

Weatherheads

Bring power into buildings and protect the entry point from rain and snow

10 products

Conduit and Fittings

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

380 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

10 products

Electrical Enclosure Panel Mounts

Add a secondary panel that swings to mount more components in your enclosure

2 products

Electrical Enclosure Positioning Arms

Hang your human-machine interface and swivel it around to save floor space and access equipment

12 products

Material Handling

Hitch Balls

Mount to hitch inserts and use with hitch receivers and couplers to tow trailers

9 products

Hitch Receivers

Use with hitch inserts and pins to create a complete hitch for towing

2 products

Tow Eyes

Mount to trailers and connect to tow hooks or drawbar couplers on vehicles for towing

14 products

Hitch-Ball Couplers

Bolt or weld to trailers and connect to hitch balls on vehicles for towing

11 products

Tow Hooks

Bolt to vehicles and connect to tow eyes on trailers for towing

9 products

Conveyor Track Brackets

Hang and join sections of enclosed conveyor track

1 product

Drawbar Couplers

Use with drawbar rings to connect trailers to vehicles; also known as pintle hitches

17 products

Vacuum Cup Swivels

Rotate and flex so your vacuum cups can grip items at an angle

2 products

Hitch Inserts

Fit into hitch receivers and secure with a hitch pin to create a connection for towing

32 products

Screw Jack End Fittings

Thread onto screw jacks to create pivot points with clevis rod ends and other linkages

4 products

Hitch-Ball Coupler Locks

Insert into the hitch-ball coupler latch or socket on your trailer to prevent theft

4 products

Scaffold Clamps

Construct scaffolding and secure supports, such as railings

2 products

Kingpins

Bolt or weld to a semi-trailer to connect it to your tractor

6 products

Hitch Kits

Everything you need to attach a hitch to your vehicle’s receiver

2 products

Robot Pedestal Adapter Kits

Attach to square pedestals to support accessories or build a custom cable management system

1 product

Containers, Storage, and Furniture

Table Leg Hinges

Add legs and mount to tabletops to create folding tables

4 products

Facility and Grounds Maintenance

Chain Link Fencing

Everything you need to build or repair a chain link fence, from posts to gates

5 products

Neutralization Tanks

Treat corrosive chemicals before they drain into sewer systems

4 products

Water Supply Stop Valves

Shut off water to faucets, toilets, and fountains

12 products

Heating, Ventilation, and Air Conditioning

Duct and Fittings

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

1,210 products

Duct Damper Handles

Replace an existing handle or pair with a blade to create your own damper

1 product

Duct Floor Sweeps

Get dust and debris off your floor and into your collection system

3 products

Duct Airflow Dampers

Regulate airflow to sections of duct

99 products

Duct Turning Vanes

Guide air smoothly around sharp bends in rectangular duct

4 products

Diffuser Collars

Connect diffusers to duct

4 products

Barometric Draft Dampers

Maintain consistent airflow in your furnace to improve its performance

6 products

Diffuser Dampers

Regulate the airflow coming out of drop-ceiling diffusers

10 products

Duct Fire Dampers

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

13 products

Chimney Pipe Fittings

Form straight, elbow, and tee connections between lengths of chimney pipe

15 products