Knuckles | McMaster-Carr

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System of Measurement

Shaft Diameter

Shape

Tube OD

Pipe Size

Shank Thread Size

Thread Type

UN/UNF (SAE Straight)

Thread Size

Shaft Type

Gender

Rod End Type

Shank Gender

Overall Length

RoHS

Compliant with Exemptions

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REACH

Compliant

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

DFARS Specialty Metals

Fitting Connection

Shaft Mount Type

For Shaft Misalignment Type

Construction

Length

8,732 Products

Power Transmission

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

Rod End Seals

Keep dirt out and lubrication in to extend the life of rod ends

16 products

Rod End Inserts

Attach to rod ends to increase the amount of misalignment they can handle

29 products

Swivel Joints

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

136 products

U-Joints

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

181 products

Shaft Couplings

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

2,110 products

Shear Couplings

Sever the connection between shafts when there's too much torque to protect parts from breaking

21 products

Shaft Adapters

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

54 products

Machinable Shaft Ends

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

56 products

Hydraulic Cylinder Mounts

Restrain cylinders and secure loads to the end of the rod

4 products

Gas Spring End Fittings

Connect gas springs to mounting studs and brackets

73 products

Gas Spring Mounts

Attach gas springs to panels, lids, and doors using a bracket or stud

139 products

Torque Limiters

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

71 products

Measuring and Inspecting

Probe Stylus Accessories

Add components that extend length, adapt threads, or hold multiple styli at once

1 product

Building and Machinery Hardware

Hinges

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

2 products

Rotary Latches

Open doors around corners and other obstructions; adjust for misalignment when closing

24 products

Push-to-Close Latches

Automatically hold doors shut when you push them closed

79 products

Leveling Mounts

Level machines and workbenches on uneven surfaces, reduce vibration, and protect floors

19 products

T-Slotted Framing and Fittings

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

127 products

Joint Covers

Shield rotating joints to keep lubricants in and contaminants out

25 products

Material Handling

Screw Jack End Fittings

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

4 products

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

246 products

Wire Rope End Fittings

Finish wire rope ends with threaded stud, eye, clevis, ball, hook, and other connections

12 products

Scaffold Clamps

Construct scaffolding and secure supports, such as railings

2 products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

21 products

Fluid Handling

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

2,352 products

Pipe and Pipe Fittings

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

93 products

Hose and Hose Fittings

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

387 products

Safety Equipment

Bandages

Cover wounds to keep them clean and protected

6 products

Gloves

Shield your hands from cuts, heat, cold, chemical splashes, and electrical and welding sparks

60 products

Lubricating

Grease Fitting Adapters

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

2 products