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Hexagonal steel lock nut with nylon insert, zinc finish, M12 thread

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 53668 Nylon Insert Lock Nut M12-1.75 Steel Class 8 Zinc

SKU CH-S23W-5B1KS

M12-1.75 nylon insert lock nut resists loosening under vibration and torque

  • Product typeNuts
  • M12-1.75 thread fits metric applications
  • Class 8 steel handles high-stress loads
  • Zinc finish resists corrosion in harsh environments
  • Nylon insert prevents loosening under vibration
  • 53668 part number ensures exact reorder match

Product identity

This is a steel lock nut with a nylon insert, thread size M12-1.75 and strength Class 8. It is supplied by Midwest Fastener Corp under part number 53668 and comes with a zinc finish.

Fit and alternatives

The nut suits assemblies that need vibration-resistant fastening on M12 threads. Buyers who require a different thread pitch, a higher strength class or a non-metallic locking element should look at other fastener types.

Capacity and headroom

The nylon insert provides prevailing torque that resists loosening under vibration and torque loads. The Class 8 rating defines the proof load limit for the M12-1.75 thread; beyond that limit the fastener can yield or the insert can overheat.

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 thread size bolt do I need to use with the M12-1.75 nylon insert lock nut?

You need a bolt or stud with an M12 diameter and 1.75 mm thread pitch to match this nut.

Will the Class 8 zinc-plated steel nut hold up against a Grade 8 bolt I already have?

Yes, the Class 8 rating pairs correctly with a Grade 8 bolt for comparable strength.

How can I confirm the nylon insert is gripping properly after I tighten the nut?

You should feel increasing resistance during the last few turns and the nut should not spin freely by hand once seated.

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