Hillman Fasteners 300018 Split Lock Washer 1/4 in 100 Pack

Product Description

The HILLMAN FASTENERS 300018 is a split lock washer designed to resist fastener loosening caused by vibration and torque relaxation. Each washer is zinc plated steel, providing corrosion resistance in general-purpose applications. The split design creates a spring-loaded bite between the fastener head and the mating surface, maintaining clamping force over time. This 100-pack format suits trade professionals who install hardware in volume, including HVAC equipment mounting, electrical panel work, plumbing fixture installation, and general mechanical assemblies. The 1/4 inch nominal size fits standard 1/4-20 and 1/4-28 fastener threads.

These split lock washers are suited for light to medium-duty indoor and sheltered outdoor installations where a zinc plated finish provides adequate corrosion protection. Common applications include equipment mounting, junction box assembly, ductwork hardware, and structural fastening in residential and light commercial construction. Electricians, HVAC technicians, plumbers, and general contractors commonly stock this size for field use. The 100-piece pack is appropriate for both single-job supply and shop inventory replenishment.

Key Features

• Split lock design resists loosening from vibration and thermal cycling
• Zinc plated steel construction for corrosion resistance in general-purpose environments
• 1/4 inch nominal size compatible with standard 1/4 inch fasteners
• 100-piece pack supports volume installs and shop stocking
• Hardened steel spring action maintains clamping load after installation

Compatibility

Designed as a standard split lock washer for use with 1/4 inch diameter fasteners across residential and light commercial trade applications.

Installation Notes

Install split lock washers between the fastener head or nut and the mating surface, with the split ends oriented to bite into both surfaces as the fastener is tightened. Do not reuse lock washers that have been fully compressed flat, as they will no longer provide spring tension. Follow applicable NEC, IPC, or IFGC torque guidance for the fastener being used in the assembly. A standard socket set or wrench is sufficient for installation.