Slotted - Hex Washer - Self Piercing Screws w/ Bonded Neo-EPDM Washer
5/16" Across Flats
Creates leak-proof seal when attaching light-gauge steel
or aluminum to wood
Case Hardened to Rockwell C45 min (Core Hardness: Rockwell C28-38)
Fully Threaded / Steel Zinc Plated
Technical Specifications / 2D 
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