1/4"-20 Locknuts | McMaster-Carr

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Material

Grade 5 Titanium

Stainless Steel

Locking Type

Distorted Thread

Finish

Black Zinc Plated

Corrosion-Resistant Coated

Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Hex Nut Profile

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Performance

Corrosion Resistant

Vibration Resistant

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Washer Material

400 Series Stainless Steel

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Cap Nut Profile

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Flange Diameter

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DFARS Specialty Metals

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Unified Standard Class 2B

Unified Standard Class 3B

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106 Products

Locknuts

Nylon-Insert Locking About Nylon-Insert Locking

About Nylon-Insert Locking

Nylon-Insert Locknuts

Nylon-Insert Locknuts

Versatile and economical—the most commonly used locknuts

Thin-Profile Nylon-Insert Locknuts

About half the height of standard nuts to fit in spaces with low clearance

Heavy-Profile Nylon-Insert Locknuts

About 10% wider and taller than standard nuts to handle heavier loads

Thin-Heavy-Profile Nylon-Insert Locknuts

Fit in low-clearance spaces and handle heavier loads than standard nuts

Mil. Spec. Nylon-Insert Locknuts

Mil. Spec. Nylon-Insert Locknuts

Meet strict U.S. military standards for material and construction

Nylon-Insert Locknut Assortments

Nylon-Insert Locknut Assortments

A range of sizes to fasten a variety of parts

Distorted-Thread Locking About Distorted-Thread Locking

About Distorted-Thread Locking

Top-Lock Distorted-Thread Locknuts

Top-Lock Distorted-Thread Locknuts

Irregularly shaped threads at the top grip screws tighter than a nylon insert

Center-Lock Distorted-Thread Locknuts

Center-Lock Distorted-Thread Locknuts

Thread on from either side so there’s no risk of damaging screws

Left-Hand-Thread Center-Lock Distorted-Thread Locknuts

Left-Hand-Thread Center-Lock Distorted-Thread Locknuts

Secure parts that rotate counterclockwise, such as the propeller on a mixer

Lock Washer About Lock Washer

About Lock Washer

Locknuts with External-Tooth Lock Washer

Locknuts with External-Tooth Lock Washer

Twist into place by hand to save on assembly time

Locknuts with Spring-Lock Washer

Locknuts with Spring-Lock Washer

Grip more tightly than external-tooth washers to better resist vibration

Assortments of Locknuts with External-Tooth Lock Washer

Assortments of Locknuts with External-Tooth Lock Washer

A range of sizes to fasten a variety of parts

Cotter-Pin Lockable About Cotter-Pin Lockable

About Cotter-Pin Lockable

Locknuts for use with Cotter Pins

Locknuts for use with Cotter Pins

Secure rotating parts subjected to mild vibration, such as wheels on carts

Flex-Top Locking About Flex-Top Locking

About Flex-Top Locking

Flex-Top Locknuts for Heavy Vibration

Flex-Top Locknuts for Heavy Vibration

Stronger hold than nylon-insert and distorted-thread locknuts

Thin-Profile Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard nuts to fit in spaces with low clearance

Heavy-Profile Flex-Top Locknuts for Heavy Vibration

About 10% wider and taller than standard nuts to handle heavier loads

Thin-Heavy-Profile Flex-Top Locknuts for Heavy Vibration

Fit in low-clearance spaces and handle heavier loads than standard nuts

Serration Locking About Serration Locking

About Serration Locking

Serrated Locknuts

Serrated Locknuts

Easiest to install but least effective against vibration

Thread-Forming Lock About Thread-Forming Lock

About Thread-Forming Lock

Thread-Forming Locknuts

Thread-Forming Locknuts

Form threads into these nuts for a tight fit that won't loosen under vibration

Other Products

Flange Nuts

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

Cap Nuts

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

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

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