3/4"-16 Nuts | McMaster-Carr

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System of Measurement

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Fastener Strength Grade/Class

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Hex Nut Profile

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Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

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Unified Standard Class 2B

Unified Standard Class 3B

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Export Control Classification Number (ECCN)

2B999

EAR99

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

Threading

247 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

51 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

36 products

Flange Nuts

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

12 products

Coupling Nuts

Connect and extend threaded rods

14 products

Cap Nuts

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

4 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

1 product

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

Weld Nuts

Weld to metal surfaces to add permanent threads

22 products

Threaded Inserts

Create new threads or repair stripped threads

72 products

Thread Adapters

Join threads of a different type, size, and gender

3 products

Fluid Handling

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

10 products

Power Transmission

Shock Absorber Mounting Nuts

Secure shock absorbers after threading them into mounting blocks

2 products

Precision Lead Screws and Nuts

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

12 products

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

3 products