Serrated Hex Washer - 5/16" A.F. - Unslotted - Self Drilling Screws - Zinc
Across the Flats: 0.305 - 0.312"; Head Height 0.105 - 0.120"
Manufactured to SAE J78 Specifications
Case Hardened to Rockwell C50 - 56
Core Hardness: Rockwell C32 - 40
Steel Zinc Plated
Technical Specifications / 2D 
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