Hillman Fasteners 300024 Split Lock Washer 3/8 Inch 100 Pack

Product Description

The HILLMAN FASTENERS 300024 is a split lock washer designed to prevent fastener loosening under vibration and torque load. Manufactured from zinc plated steel, this washer measures 3/8 inch and is sold in a 100-pack quantity. The split ring design bites into the mating surface and the fastener head, creating resistance against rotational loosening. This type of hardware is widely used by electricians, plumbers, HVAC technicians, and general contractors in both new construction and service work wherever reliable fastener retention is required.

This split lock washer is suited for residential and light commercial applications where 3/8 inch fasteners are used. Common installation scenarios include mechanical equipment mounting, electrical panel and junction box assembly, pipe hanger hardware, and structural connections subject to vibration. The 100-pack count makes this item practical for shop stock, service vans, and job-site hardware bins.

Key Features

• Split ring design resists fastener back-off under vibration and dynamic loads
• Zinc plated steel construction provides corrosion resistance in general indoor and sheltered outdoor environments
• 3/8 inch bore size fits standard 3/8 inch fasteners
• 100-pack quantity supports bulk stocking for service and construction trades
• Flat bearing surfaces on both sides for consistent clamp load distribution

Compatibility

Designed as an OEM-style replacement and general-use split lock washer for 3/8 inch fastener assemblies across mechanical, electrical, and plumbing trade applications.

Installation Notes

Install between the fastener head or nut and the mating surface with the split gap oriented to engage both surfaces as the fastener is tightened. Ensure mating surfaces are clean and free of debris before assembly. Follow applicable code requirements such as NEC or IPC for fastener specifications in electrical or plumbing installations. Do not reuse lock washers that have been fully compressed flat, as the locking action will be diminished.