5/16"-24 Nuts | McMaster-Carr

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Hex Nut Profile

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Cadmium Yellow-Chromate Plated

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Compliant with Exemptions

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Flange Diameter

542 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

54 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

42 products

Flange Nuts

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

21 products

Coupling Nuts

Connect and extend threaded rods

17 products

Cap Nuts

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

10 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

9 products

Square Nuts

Flat sides won’t spin in channels and square holes

1 product

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

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

1 product

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

1 product

Weld Nuts

Weld to metal surfaces to add permanent threads

17 products

Rivet-Mount Nuts

Add threads in hard-to-reach areas and materials that are too thin to be tapped

5 products

Press-Fit Nuts

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

3 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

6 products

Threaded Inserts

Create new threads or repair stripped threads

60 products

Thread Adapters

Join threads of a different type, size, and gender

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

2 products

Material Handling

Turnbuckles

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

1 product

Fabricating and Machining

Fixturing Clamps

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

2 products