1/2"-20 Fasteners | McMaster-Carr

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Threaded on Both Ends

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Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

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Unified Standard Class 1A

Unified Standard Class 2A

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Less than 10,000 psi

30,000 psi to 99,999 psi

100,000 psi or greater

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

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Compliant with Exemptions

Performance

1,359 Products

Fastening and Joining

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

219 products

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

74 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

29 products

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

13 products

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

23 products

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

25 products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

81 products

T-Bolts

Turn by hand for easy fastening, use as a handle, or attach as a point for straps and clamps

2 products

Hex Nuts

Handle most general fastening needs

59 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

44 products

Lug Nuts

Secure pneumatic wheels to axles

1 product

Flange Nuts

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

24 products

Cap Nuts

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

9 products

Coupling Nuts

Connect and extend threaded rods

15 products

Socket Nuts

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

2 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

3 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

4 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Threaded Inserts

Create new threads or repair stripped threads

79 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 Rods

Anchor, connect, or hang components in a wide variety of applications

122 products

Standoffs

Separate, position, or connect components in assemblies

8 products

Thread Adapters

Join threads of a different type, size, and gender

223 products

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

3 products

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

16 products

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

Power Transmission

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

10 products

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

79 products

Shock Absorber Mounting Nuts

Secure shock absorbers after threading them into mounting blocks

1 product

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

4 products

Material Handling

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

8 products

Turnbuckles

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

15 products

Fabricating and Machining

Drill Bushings

Fit in holes to guide drill bits and other cutting tools for precise and repeatable holes and cuts

25 products

Fixture Clamps

Secure your workpiece to a fixture table so it won't move during machining

4 products

Fluid Handling

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

7 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

2 products

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

3 products