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Yellow steel lock nut with nylon insert, hexagonal form

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 08207 Nylon Insert Lock Nut 3/8"-16 Steel Grade 8 Yellow

SKU CH-31QS-QEQ6H

A 3/8"-16 Grade 8 steel lock nut with a nylon insert that resists loosening under vibration and torque

  • Product typeNuts
  • Resists vibration loosening with nylon insert
  • Grade 8 steel handles high-stress loads
  • Yellow finish adds corrosion protection
  • 3/8"-16 thread fits standard hardware
  • Model 8207 ensures correct replacement part

Product Identity

The Midwest Fastener 08207 is a nylon insert lock nut built from Grade 8 steel with a yellow finish. It uses a 3/8"-16 thread and is supplied new for general hardware applications.

Ideal Users and Limits

This nut suits anyone needing a vibration-resistant fastener that will not loosen under torque. It is not for buyers who require a different thread pitch, a non-locking hex nut, or a stainless steel option for corrosion resistance.

Build Integration

The nylon insert grips the mating threads to prevent back-off without extra washers or adhesives. The Grade 8 rating provides high tensile strength for structural joints, freeing the installer from secondary locking methods.

How it compares

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

Price $16.99
Cheaper than about 55% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

What bolt diameter and thread pitch does the 3/8"-16 lock nut fit?

The nut is cut for a 3/8 inch diameter bolt with 16 threads per inch, so it matches any Grade 8 bolt of that exact size.

Will the nylon insert stay effective if I reuse the nut on an older Grade 8 bolt?

The nylon collar is designed for a single tightening cycle; reusing it on a used bolt reduces prevailing torque and may not prevent loosening under vibration.

How can I confirm the nut is seated correctly after installation?

Run the nut until the nylon insert fully engages the bolt threads — you will feel a distinct rise in resistance — then torque to the Grade 8 specification for 3/8"-16.

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