1/2"-20 Nuts | McMaster-Carr

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Hex Nut Profile

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513 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

59 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

44 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

24 products

Coupling Nuts

Connect and extend threaded rods

15 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

9 products

Lug Nuts

Secure pneumatic wheels to axles

1 product

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

4 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

3 products

Weld Nuts

Weld to metal surfaces to add permanent threads

23 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

1 product

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

1 product

Threaded Inserts

Create new threads or repair stripped threads

51 products

Thread Adapters

Join threads of a different type, size, and gender

223 products

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

Power Transmission

Shock Absorber Mounting Nuts

Secure shock absorbers after threading them into mounting blocks

1 product

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

4 products

Fluid Handling

Tube and Tube Fittings

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

7 products

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

3 products

Material Handling

Turnbuckles

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

1 product