UCAN Fastening Products UTB125, 1/2"x5" Hex Torpedo Bolt Galv (30/Pkg). UCAN TORPEDO BOLT is an excellent anchoring solution for medium duty and temporary applications. It is mechanically galvanized for corrosion resistance so, it is well suited for outdoor use. Matched with a standard UCAN ANSI tolerance drill bit, this fastener exhibits consistently high load values. UCAN TORPEDO BOLT installs quickly leaving the clean appearance of a finished hex washer head on the working surface.