UNC Locknuts | McMaster-Carr

Filter by

System of Measurement

Nut Type

Tamper Resistant

With Sight Hole

Material

Grade 5 Titanium

Stainless Steel

Locking Type

Distorted Thread

Finish

Black Zinc Plated

Cadmium Yellow-Chromate Plated

Corrosion-Resistant Coated

Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Hex Nut Profile

Fastener Strength Grade/Class

Width

Height

Thread Type

Performance

Corrosion Resistant

High Temperature

Vibration Resistant

Thread Spacing

Thread Direction

Fastener Strength Rating

Washer Material

400 Series Stainless Steel

Flange Diameter

Thread Fit

Unified Standard Class 2B

Unified Standard Class 3B

Color

Specifications Met

DFARS Specialty Metals

Cap Nut Profile

Sold As

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

How can we improve?

942 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. Thin-Profile Nylon-Insert Locknuts

Meet U.S. military standards and are half the height of standard nuts to fit in low-clearance spaces

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

Narrow-Profile Locknuts with External-Tooth Lock Washer

20% narrower than other nuts to fit in cramped spaces

Locknuts with Spring-Lock Washer

Locknuts with Spring-Lock Washer

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

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

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

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

Steel-Insert Locking About Steel-Insert Locking

About Steel-Insert Locking

Steel-Insert Locknuts for Extreme Vibration

Steel-Insert Locknuts for Extreme Vibration

The most vibration-resistant hold we offer

Thin-Profile Steel-Insert Locknuts for Extreme Vibration

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

Heavy-Profile Steel-Insert Locknuts for Extreme Vibration

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

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

Press-Fit Nuts

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

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.)