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Yellow zinc steel lock nuts, 25 pieces, Grade 8

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 50352 Lock Nut 5/8"-11 Grade 8 Yellow Zinc 25 PK

SKU CH-Q6RD-YHBFF

Grade 8 steel lock nuts with yellow zinc finish, 25 pieces for secure 5/8"-11 fastening

  • Product typeNuts
  • Grade 8 strength handles heavy-duty loads
  • Yellow zinc finish resists corrosion
  • 25 nuts per pack for multiple jobs
  • 5/8"-11 thread fits standard bolts
  • Flange design distributes pressure evenly

5/8"-11 Grade 8 lock nuts, 25 pack

These MIDWEST FASTENER lock nuts feature a 5/8"-11 thread pitch and a Grade 8 steel construction for high-strength fastening. The yellow zinc finish provides corrosion resistance for automotive and industrial applications. The pack contains 25 pieces for multiple installation points.

Integrated flange distributes clamping force

The built-in flange acts as a non-spinning washer to spread pressure across the mating surface. This design reduces the risk of part damage and helps prevent loosening caused by uneven surfaces or vibration. No separate washer is required for assembly.

Grade 8 rating defines the load capacity

The Grade 8 classification indicates the tensile strength required for heavy-duty structural joints. Buyers needing a lower strength rating or a different thread size should select an alternative fastener. Verify the 5/8"-11 specification matches the bolt before purchase.

How it compares

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

Price $36.99
Pricier than about 66% 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 5/8"-11 Grade 8 lock nuts and what step is often missed?

Thread each nut onto the matching bolt by hand, then torque to the Grade 8 specification for the 5/8"-11 size; the step often missed is verifying the prevailing torque feel before final tightening.

What maintenance or replacement will the 25-pack of Grade 8 lock nuts need later?

Inspect the yellow zinc finish for corrosion and check prevailing torque at each service interval; replace any nut that shows thread damage or reduced locking resistance.

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

The prevailing torque feature of the lock nut design is the first limit; it can degrade with repeated thermal cycling and vibration, reducing clamp load retention.

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