Hillman Fasteners 300027 Split Lock Washer 7/16 in 50 Pack

Product Description

The HILLMAN FASTENERS 300027 is a 7/16-inch split lock washer supplied in a 50-piece pack. Split lock washers are hardened, split-ring fastener components that apply spring tension against a nut or bolt head, resisting loosening caused by vibration and dynamic loads. This zinc-plated steel construction provides corrosion resistance suitable for general indoor and light outdoor fastening applications. Electricians, plumbers, HVAC technicians, and general contractors use split lock washers as a standard component in equipment mounting, panel work, and structural fastening tasks where fastener retention is a code or best-practice requirement.

This washer is suited for residential and light commercial applications involving 7/16-inch fastener assemblies. Common install scenarios include securing equipment brackets, electrical enclosures, pipe hangers, conduit straps, and mechanical components where vibration or thermal cycling may otherwise allow fasteners to back out over time. The zinc plating makes these appropriate for dry or occasionally damp environments, though they are not rated for continuous immersion or highly corrosive settings.

Key Features

• 7/16-inch bore size fits standard 7/16-inch bolts and screws
• Split lock design applies spring tension to resist vibration-induced loosening
• Zinc-plated steel construction provides general-purpose corrosion resistance
• 50-piece pack quantity suited for job-site and service-van stocking
• Compatible with standard hex nuts and bolt heads in common fastener assemblies

Compatibility

Designed as a standard 7/16-inch split lock washer for use in general fastener assemblies across HVAC, plumbing, electrical, and mechanical trade applications.

Installation Notes

Split lock washers are installed between the fastener head or nut and the mating surface before final torque is applied. Ensure the fastener, washer bore, and mating hardware are all the same nominal size before assembly. Do not reuse split lock washers that have been fully compressed flat, as they will no longer provide effective spring tension. Follow applicable NEC, IPC, or IFGC guidelines when using fasteners in code-governed installations.