These custom grade 8 T-bolts were produced using SAE J429 material to Grade 8 specifications, finished with a black oxide process.  An existing sample was used to recreate the design and tooling for the head shape.  3/8-20 unorthodox thread pitch was rolled at thread length of .8" minimum.  Overall length of the part was set at 1.212" +/-.01" and the max head diameter reached .757" +/-.01".  The parts were used in a blade assembly on harvesting equipment.