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Box of fifty yellow zinc lock nuts with flanged base

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 50351 Lock Nut 1/2"-13 Grade 8 Yellow Zinc 50 PK

SKU CH-V471-9YPVR

Grade 8 steel lock nuts with yellow zinc finish, supplied in a 50-piece pack

  • Product typeNuts
  • Grade 8 strength handles heavy loads
  • Yellow zinc coating resists corrosion
  • 1/2"-13 thread fits standard bolts
  • 50-piece pack covers large projects
  • Flange design distributes pressure evenly

Product identity

These are Grade 8 steel lock nuts with a 1/2"-13 thread pitch and yellow zinc finish, supplied in a 50-piece pack. They suit mechanics, fabricators and maintenance teams who need high-strength fasteners that resist vibration loosening on heavy equipment, truck frames or structural steel assemblies.

Compatibility check

Verify that the mating bolts or studs are 1/2"-13 thread and that the application calls for Grade 8 strength before ordering. Confirm the yellow zinc coating meets your corrosion-resistance requirements and that a flange-style nut is acceptable where a standard hex nut was specified.

Build integration

The integrated flange distributes clamping force over a wider area, reducing surface damage and the need for separate flat washers. This simplifies the fastener stack and saves assembly time on high-vibration joints such as suspension mounts, engine brackets or trailer couplings.

How it compares

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

Price $30.99
Pricier than about 62% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

What comes in the 50351 pack and is anything else needed to use them?

The pack contains 50 lock nuts with a 1/2"-13 thread, Grade 8 steel and yellow zinc finish. No extra parts are required for installation.

How do I choose between the listed versions or capacities for this fastener?

Only one version is offered: 50 pieces of 1/2"-13 Grade 8 yellow zinc lock nuts. Select this pack when you need that exact quantity and specification.

What does the Grade 8 rating mean once the nut is installed in a real assembly?

Grade 8 indicates high tensile strength for heavy-duty clamping loads. The yellow zinc coating adds corrosion resistance, and the lock-nut design resists loosening under vibration.

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