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5/8" USS zinc-plated flat washers - $8 (Ronkonkoma)
856 Johnson Ave
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Installation: Slide onto 5/8" bolts/rods before tightening; compatible with coarse threads (11 TPI). Torque to spec (e.g., 100–150 ft-lbs for Grade 5 bolts) with wrench—no special tools. Stackable for spacers.
Material & Durability: Low-carbon steel with electroplated zinc (ASTM B633, Type III) for corrosion resistance (96–250 hrs. salt spray); ideal for indoor/dry outdoor. Burr-free edges for smooth assembly.
Compatibility: Fits 5/8"-11 bolts/nuts; USS pattern for construction (larger OD than SAE). Works in wood, metal, concrete; reusable if undeformed.
Advantages: Economical bulk option; prevents bolt/nut embedding; vibration-resistant in assemblies. Made to U.S. standards for reliability.
Limitations: Basic corrosion protection (upgrade to SS for wet/marine); not for extreme loads (use Grade 8 for high-torque). Single-use if crushed.