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Hex lock nut with yellow zinc finish and nylon insert

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 8205 Nylon Insert Lock Nut 1/4"-20 Steel Grade 8 Yellow

SKU CH-P6HS-WE3CH

Resists loosening under vibration and torque with a nylon insert in Grade 8 steel

  • Product typeNuts
  • Resists loosening under vibration thanks to nylon insert
  • 1/4"-20 thread fits standard coarse bolts
  • Grade 8 steel delivers high tensile strength
  • Yellow zinc finish protects against corrosion
  • Manufacturer part 8205 for easy reordering

MIDWEST FASTENER Lock Nut 1/4"-20 Grade 8

This lock nut is a nut that resists loosening under vibrations and torque. It is built from steel with a yellow finish for corrosion resistance. The Grade 8 rating indicates high tensile strength for demanding fastening tasks. Suitable for automotive, machinery and general repair applications where vibration is a concern.

Vibration resistance with nylon insert

The nylon insert creates prevailing torque that keeps the nut tight without lock washers or adhesives. Steel construction handles high clamping loads in normal service conditions. Yellow plating provides a protective barrier against rust and environmental exposure. Designed for reliable performance where standard nuts may back off over time.

Upgrade from standard hex nuts

Replaces ordinary hex nuts in assemblies subject to vibration, shock or thermal cycling. The jump is worth it when joint integrity must be maintained without periodic re-torquing. Not for buyers who need a free-spinning nut for frequent adjustment or applications requiring a prevailing torque specification not listed here.

How it compares

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

Price $10.99
Cheaper than about 70% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

How do I install the 1/4"-20 Grade 8 nylon insert lock nut and what is the common mistake?

Thread the nut onto the bolt until the nylon insert engages the threads; the common mistake is reusing the nut after removal because the insert loses its grip.

What maintenance or replacement will the nylon insert lock nut need later?

Inspect the nylon insert for wear or deformation after each disassembly; replace the nut if the insert no longer resists turning by hand.

What limit appears first on the Grade 8 steel lock nut under sustained vibration?

The nylon insert reaches its temperature limit before the Grade 8 steel yields, causing loss of prevailing torque.

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