Hillman Fasteners 300036 Split Lock Washer 5/8 in 25 Pack

Product Description

The HILLMAN FASTENERS 300036 is a 5/8-inch split lock washer designed to prevent fastener loosening under vibration and dynamic loads. Constructed from zinc-plated steel, it delivers corrosion resistance suitable for general-purpose mechanical and structural assemblies. The split ring design bites into the fastener and mating surface as torque is applied, resisting backout in bolted connections. Each package contains 25 washers. This hardware is used by electricians, plumbers, HVAC technicians, and general contractors wherever bolt retention is required in light- to medium-duty applications.

The 300036 split lock washer is appropriate for residential and light commercial installations where a 5/8-inch fastener is used. Common applications include equipment mounting, panel attachment, pipe hanger assembly, and general mechanical fastening. The zinc plating provides a base level of corrosion resistance for indoor and moderately protected outdoor use. These washers are sold in a 25-piece pack, making them practical for single-job use or restocking a service vehicle.

Key Features

• Split ring design creates tension that resists fastener backout under vibration
• 5/8-inch inner diameter fits standard 5/8-inch bolts and screws
• Zinc-plated steel construction for corrosion resistance in general-purpose use
• 25-piece pack quantity suits single-job needs or van stock replenishment
• Compatible with standard hex bolts, machine screws, and threaded rod in 5/8-inch sizing

Compatibility

Designed as a general-purpose split lock washer for use with standard 5/8-inch fasteners in residential and light commercial mechanical, electrical, and plumbing assemblies.

Installation Notes

Install the split lock washer between the nut or bolt head and the mating surface before final torque is applied. Ensure the fastener and washer are properly aligned to avoid cocking, which reduces locking effectiveness. Follow applicable code requirements for the trade and assembly type, including NEC guidelines for electrical enclosure hardware. No special tools are required beyond standard wrenches or sockets.