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Small steel lock nut with external tooth washer, #8-32 thread

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 03817 External Tooth Lock Washer Lock Nut #8-32 Steel Grade

SKU CH-N5X5-68Z8T

#8-32 steel lock nut with external tooth washer resists loosening from vibration

  • Product typeNuts
  • External tooth design resists vibration loosening
  • #8-32 thread fits compatible fasteners securely
  • Steel construction provides durable fastening strength
  • Lock washer integrated for reliable grip
  • Grade rated for consistent performance quality

Product identity

The MIDWEST FASTENER 03817 is a #8-32 steel lock nut with an external tooth lock washer integrated into the flange. It is intended for mechanics, maintenance technicians and DIY builders who need a single fastener that resists loosening on vibrating assemblies.

Sustained vibration resistance

The external teeth bite into the mating surface when the nut is torqued, creating a mechanical lock that holds under continuous vibration and torque cycles. Unlike a plain nut with a separate washer, the one-piece design cannot shift or fall off during repeated thermal expansion and contraction.

Thread standard limits

The #8-32 Unified Fine thread governs the fit; it determines the pitch diameter, minor diameter and class of fit that the nut will accept. Mating hardware must match this exact thread series or the locking action will not engage and the joint may fail.

How it compares

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

Price $8.99
Cheaper than about 85% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

How much vibration and torque can the #8-32 external tooth lock washer lock nut resist before loosening?

The lock nut is designed to resist loosening under vibrations and torque, with the external tooth lock washer biting into the mating surface to maintain clamping force in dynamic assemblies.

What thread size and driver do I need to install the #8-32 steel lock nut?

You need a matching #8-32 male thread and a standard hex driver or wrench sized for a #8 nut; no special tools are required beyond common hand tools.

Will the steel #8-32 lock nut gall or seize when reused on older stainless or plated fasteners?

The steel nut can be reused on compatible threads, but applying a light lubricant reduces galling risk when mating with stainless or plated hardware of the same #8-32 pitch.

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