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Hexagonal steel lock nut with external tooth lock washer base, 3/8"-16 thread, silver finish

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 03822 External Tooth Lock Washer Lock Nut 3/8"-16 Steel

SKU CH-9671-K1YDA

A lock nut with an external tooth lock washer resists loosening under vibration and torque

  • Product typeNuts
  • Resists vibration loosening with integrated lock washer
  • 3/8"-16 thread fits standard coarse bolts
  • Steel construction handles high-torque applications
  • External teeth bite into mating surfaces
  • MIDWEST FASTENER 03822 lock nut design

3/8"-16 Lock Nut for Vibration Resistance

This external tooth lock washer lock nut is designed to resist loosening caused by vibration and torque. The integrated toothed washer bites into the mating surface for a secure hold. It suits automotive, industrial and general mechanical assemblies where a 3/8"-16 thread is required. Builders needing a different thread pitch or a non-locking nut should look elsewhere.

Steel Construction with External Tooth Washer

The nut body is made from steel and features an external tooth lock washer formed into the flange. This single-piece design eliminates the need for a separate flat washer and lock washer stack. The teeth engage the joint face during tightening to maintain clamp load. Installations requiring a smooth bearing surface or a nylon insert lock nut will not match this profile.

Supplied as Individual Fastener Hardware

Each unit is sold as a single lock nut without additional components, lubricant or installation tools. The part arrives ready for use with standard 3/8"-16 bolts or studs. Projects requiring bulk quantities, assortment kits or pre-applied thread sealant will need supplementary sourcing.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $21.99
Typical for this category: the median of 2,607 items is $18.99.

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

What thread standard does the 3/8"-16 lock nut follow?

The nut uses a Unified National Coarse 3/8"-16 thread, so it mates with any standard 3/8"-16 bolt or stud.

What size wrench or socket fits the hex on this nut?

A standard 3/8"-16 hex nut takes a 9/16 inch wrench or socket across the flats.

Which way does the external-tooth washer face during installation?

Place the nut so the toothed washer face sits against the bearing surface; the teeth dig in when you tighten the nut.

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