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Hexagonal stainless steel nut with nylon insert, 1/2"-20 thread, part 68493

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 68493 Nylon Insert Lock Nut 1/2"-20 18-8 Stainless Steel

SKU CH-11MW-EPV03

A nylon-insert lock nut in 18-8 stainless steel that resists loosening under vibration and torque

  • Product typeNuts
  • Resists loosening under vibration with nylon insert
  • 18-8 stainless steel resists corrosion in harsh environments
  • 1/2"-20 thread fits compatible bolts securely
  • New condition ensures reliable first-use performance
  • Manufacturer part 68493 for easy identification

Product Identity

The MIDWEST FASTENER CORP 68493 is a nylon insert lock nut built for 1/2"-20 threads. It uses 18-8 stainless steel for corrosion resistance in automotive and general hardware applications. The nylon insert provides a prevailing torque feature that resists loosening caused by vibration. This fastener suits mechanics and DIYers needing reliable locking performance.

Installation Notes

Thread the nut onto the bolt by hand until the nylon insert engages the threads. A standard wrench or socket completes the tightening without special tools. The insert creates friction so the nut will not spin freely like a standard hex nut. Cross-threading damages the nylon ring and reduces holding power; start straight and do not force it.

Fitment Guidance

This nut fits any 1/2"-20 bolt or stud where a reusable locking fastener is required. It is not suited for high-temperature environments that exceed the nylon insert's melting point. Buyers needing a prevailing torque nut for metric threads or a different inch pitch should select a matching specification. Applications requiring a free-spinning nut for frequent adjustment should use a standard hex nut instead.

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 confirm the 1/2"-20 nylon insert lock nut is working after installation?

Tighten the nut on the bolt and check that the nylon insert grips the threads firmly, resisting loosening when the assembly is subjected to vibration or torque.

What comes in the box with the MIDWEST FASTENER 68493 lock nut and what must be purchased separately?

The package contains the 1/2"-20 18-8 stainless steel nylon insert lock nut; matching bolts, washers or tools are not included and must be bought separately.

Which version of the 68493 nylon insert lock nut should I choose for my application?

Select the 1/2"-20 thread size in 18-8 stainless steel when your project requires that exact diameter, pitch and corrosion-resistant material.

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