5/16"-18 Hex Cap Bolts / screws. These are Heavy Duty Grade 8 Alloy Steel with Zinc-Yellow plating.
Thread Size: 18 - Coarse (Standard) Thread
Length: Please select from drop down menu above.
Full Thread up to 1-1/4", partial thread beyond (PT)
Wrench Size: 1/2"
Type: Hex Cap Bolt / Screw
Matching Nut & Washers: 5/16-18 Available here
System of Measurement: U.S. / Inch
Material: Grade 8 Alloy Steel w Zinc Yellow
Specifications: ASTM B18.2.1