5/16-18 Grade 5 Hex Head Cap Screws
Coarse (USS) Thread
Zinc Plated Steel

The length of a cap screw is measured from the under-head bearing surface to the extreme end of the screw.
(FT)=Full Thread | (PT)=Partial Thread
Thread Length on a 5/16-18 bolt is approx. 7/8"
Wrench Size = 1/2"

Stock Photos - to verify Thread Length, goto:

Torque Chart