The threads are a 7/16-20 on the nut side of the stud and on the manifold side a 7/16-14. The unique feature of these studs are that they have an internal broached hex that make installation a snap with an Allen wrench. The hard anodizing helps prevent galling and the alum. provides light weight while providing a safety factor in the event of a supercharger backfire saving your supercharger or manifold.
Stud is 2.160" overall, .600" coarse thread, .440" shoulder, 1.030" fine thread and .090" lead in starter to get the blower nut to start easy with no effort.