Hillman Fasteners 270070 Flat Washer 5/8 in Zinc Plated 25 Pack

Product Description

The HILLMAN FASTENERS 270070 is a zinc plated steel flat washer in the wide pattern USS configuration, sold in a 25-pack. Flat washers distribute load across a fastened joint, reducing the risk of surface damage and fastener pull-through. This washer measures 5/8 inch in bore size and follows the USS wide pattern standard, which provides a broader bearing surface than SAE pattern washers. The zinc plating adds corrosion resistance for general-purpose indoor and outdoor applications. Plumbers, electricians, HVAC technicians, and general contractors routinely keep these on hand for equipment mounting, pipe strapping, and structural fastening work.

The 270070 flat washer is suited for residential and light commercial applications wherever a 5/8 inch fastener requires load distribution or surface protection. Common uses include equipment base mounting, panel attachment, pipe hanger assemblies, and general mechanical fastening tasks across plumbing, HVAC, and electrical trades. The USS wide pattern makes it appropriate for softer substrates where a larger bearing surface is needed to prevent pull-through or surface marring.

Key Features

• 5/8 inch bore size fits standard 5/8 inch fasteners
• USS wide pattern provides a larger bearing surface than SAE pattern washers
• Zinc plated steel construction offers general corrosion resistance
• 25-pack quantity reduces frequent restocking on active job sites
• Suitable for both indoor and outdoor general-purpose fastening applications

Compatibility

Designed as a general-purpose replacement or stock flat washer for use with standard 5/8 inch bolts, screws, and threaded rod in residential and light commercial fastening applications.

Installation Notes

Installation requires no specialized tools beyond standard wrenches or sockets. Always power down or de-energize equipment before accessing mounting hardware on electrical or HVAC systems. Place the washer between the fastener head or nut and the mating surface to distribute clamping load. Follow applicable codes such as the NEC or IPC when using fasteners in code-governed installations.