Hillman Fasteners 830668 Split Lock Washer 5/16 in 100PK

Product Description

The HILLMAN FASTENERS 830668 is a medium split lock washer designed to resist fastener loosening caused by vibration, torque, and dynamic loads. At 5/16 inches in diameter, this washer fits standard 5/16-inch bolts and screws. Constructed from stainless steel, it delivers corrosion resistance suitable for wet, outdoor, or chemically exposed environments. Each box contains 100 washers, making it a practical stock quantity for contractors, maintenance technicians, and trade professionals who install hardware in volume. The split design bites into the fastener and mating surface to maintain clamp force over time.

This lock washer is used across residential and commercial applications wherever 5/16-inch fasteners require a secure, vibration-resistant connection. Common install scenarios include mechanical equipment mounting, HVAC component attachment, plumbing fixture anchoring, electrical enclosure assembly, and general structural fastening. The stainless steel construction makes these washers well suited for outdoor installations, marine-adjacent environments, and any setting where carbon steel hardware would corrode prematurely.

Key Features

• Medium split design bites into mating surfaces to resist fastener back-out under vibration
• Stainless steel construction provides corrosion resistance in wet and outdoor environments
• 5/16-inch inner diameter fits standard 5/16-inch bolts and machine screws
• 100-piece pack supports volume installations and shop inventory
• Box quantity of 12 units available for bulk stocking

Compatibility

Designed for use with standard 5/16-inch bolts and machine screws across general mechanical, HVAC, plumbing, and electrical fastening applications.

Installation Notes

Lock washers are installed by a wide range of trades including HVAC technicians, plumbers, and electricians during equipment mounting and enclosure assembly. Place the lock washer between the fastener head or nut and the mating surface before tightening. Ensure the fastener and mating surface are clean and free of debris to allow proper bite. Follow applicable torque guidelines for the fastener grade and size per relevant mechanical or electrical codes.