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Hexagonal steel lock nut with zinc finish and nylon insert

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 03662 Nylon Insert Lock Nut 5/16"-24 Steel Grade 2 Zinc

SKU CH-ZAVB-B0VCJ

Nylon-insert lock nut with 5/16"-24 threads, steel Grade 2, zinc finish, resists vibration loosening

  • Product typeNuts
  • Nylon insert resists loosening from vibration
  • 5/16"-24 thread fits standard Grade 2 bolts
  • Zinc coating protects steel from corrosion
  • Manufacturer part number 03662 ensures correct replacement
  • New condition guarantees full locking performance

Steel lock nut for vibration resistance

This 5/16"-24 steel lock nut uses a nylon insert to resist loosening under vibration and torque. It is rated Grade 2 and finished in zinc for general-purpose fastening. The component suits automotive, machinery and maintenance tasks where a secure threaded joint is required.

Nylon insert prevents back-off under torque

The nylon insert creates prevailing torque that keeps the nut from rotating loose when the assembly vibrates or cycles under load. This single feature determines whether the fastener will hold in dynamic applications such as engine mounts, suspension links or equipment brackets.

Threads onto standard 5/16"-24 bolts

The nut fits any 5/16"-24 UNF bolt or stud, so it works with existing hardware in the same thread series. Zinc plating provides baseline corrosion protection for indoor or sheltered outdoor use. Buyers who need a higher proof load or a different thread pitch should select a different grade or size.

How it compares

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

Price $9.99
Cheaper than about 80% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

What does the 5/16"-24 thread size mean for fitting this nut on a bolt?

The nut fits a 5/16 inch diameter bolt with 24 threads per inch, so the bolt must match that exact diameter and fine-thread pitch to engage properly.

How does the zinc finish affect the nut in a real assembly?

The zinc coating provides a layer of corrosion resistance that protects the Grade 2 steel from rust in typical automotive or outdoor environments.

What physical space does the nylon insert need inside the nut?

The internal nylon ring sits at the top of the nut threads and requires the bolt to protrude fully through the nut so the insert can grip the threads and create the locking action.

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