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5/16"-18 x 2-1/2" Grade 9 Alloy Frame Bolt, Non-Indented, Non-Serrated, Black Phosphate & Oil (800/Bulk Pkg.)
Gr. Alloy Frame Bolt - Trim Head IFI 111 (Partial Thread) (Non-Indented Head)
Material: Alloy Steel AISI 4135
Tensile Strength: Min 180,000 PSI
Core Hardness: HRC 39 ~ 45
Screw Threads: ANSI B1.1 UNC
Class of Threads: #8 ~ 3/4, 2A