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Hexagonal stainless steel lock nut with nylon insert visible in threads

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 68494 Nylon Insert Lock Nut 5/8"-18 18-8 Stainless Steel hardware

SKU CH-Z7V2-PA7VS

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

  • Product typeNuts
  • Resists loosening under vibration and torque
  • 18-8 stainless steel construction for corrosion resistance
  • Nylon insert provides prevailing torque lock
  • Model 68494 ensures correct thread specification
  • Manufacturer direct shipping on orders over $75

Product identity

This MIDWEST FASTENER lock nut is a 5/8"-18 fastener made from 18-8 stainless steel. It suits mechanics and builders who need a vibration-resistant nut for general hardware assemblies.

Build and fit

The nylon insert creates prevailing torque that resists loosening when the joint vibrates. Stainless construction withstands corrosion in outdoor or damp environments, and the standard thread allows use with common bolts and studs.

Deciding specification

The 5/8"-18 thread pitch is the single detail that determines whether this nut fits your bolt. Verify the mating thread before ordering, because a mismatched pitch will not engage.

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

What does the 5/8"-18 thread standard mean for fit?

The 5/8"-18 designation indicates a 5/8 inch diameter with 18 threads per inch, so it mates only with bolts or studs cut to that exact pitch.

What physical clearance does the 18-8 stainless steel nut need?

A standard 5/8" wrench or socket fits the hex; the nylon insert adds a few millimetres of height, so allow extra thread length beyond the joint.

How is the nylon insert lock nut installed correctly?

Spin it on by hand until the insert contacts the threads, then torque with a wrench; the step often missed is ensuring full metal-to-metal contact before final tightening.

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