#4 X 3/8 Phillips Pan Head Steel Black Oxide & Waxed Tri-lobular 48-2 Thread Rolling Screws
Fully Threaded
Head to ASME B18.6.4 diamensions.
Manufactured to SAE J81 & Tri-lobular PT specifications.
Case Hardened to Rockwell C45 min. (Core Hardness: Rockwell C28-38)