5/8"-18 Nuts | McMaster-Carr

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181 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Flange Nuts

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

Coupling Nuts

Connect and extend threaded rods

Cap Nuts

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

Socket Nuts

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

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Easy to tighten and loosen by hand for making frequent adjustments

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Weld Nuts

Weld to metal surfaces to add permanent threads

Fluid Handling

Tube Fitting Nuts

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

Hose and Hose Fittings

Hose and Hose Fittings

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

Material Handling

Turnbuckles

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

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)