3/8"-16 Cap Nuts | McMaster-Carr

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Stainless Steel

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Corrosion-Resistant Coated

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Corrosion Resistant

Metal Detectable

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Food and Beverage

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Unified Standard Class 2B

Unified Standard Class 3B

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34 Products

Cap Nuts

Cap Nuts

The most commonly used cap nuts

Cap Nut Assortments

Cap Nut Assortments

A range of sizes to fasten a variety of parts

Nylon-Insert Cap Nuts

Nylon-Insert Cap Nuts

A nylon insert prevents loosening from moderate vibration

Cap Nuts with Threadlocker

Cap Nuts with Threadlocker

A nylon patch on the threads resists loosening from mild vibration

Distorted-Thread Cap Nuts

Distorted-Thread Cap Nuts

Irregularly shaped threads grip better than a nylon insert

Sealing Cap Nuts

Sealing Cap Nuts

Keep out liquid, debris, and other contaminants

High-Profile Cap Nuts

Cover extra-long screws without cutting them

High-Heavy-Profile Cap Nuts

Large gripping area keeps wrenches from slipping off as you tighten

Sanitary Cap Nuts

Sanitary Cap Nuts

Free of crevices where bacteria can grow

Open-End Cap Nuts

Open-End Cap Nuts

Thread onto screws of any length

Other Products

Terminal Covers

Terminal Covers

Block out dirt and corrosion to protect battery terminals

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