I need to tap a lot of holes in plastic for my job, so I found a method that is much faster than tapping by hand.
To certify the quality of their product, technical SPA Turbo sent the SPA 7/16″ connecting rod bolts to the renowned “Tork” lab in São Paulo, for tensile strength test.
For reference purposes, in addition to the SPA 7/16″ connecting rod bolts, the world famous ARP 2000 and L19 bolts were tested.