Titanium Domed Hex Flange Head M8-1.25 X 15mm Grip Length = 0mm. Thread Length = 15mm. The heads have been forged with a convex head to prevent snagging of boots or pants and the threads have been rolled for better fatigue resistance. Made from Aircraft grade material that has been heat treated to a Minimum UTS of 140Ksi (1103Mpa) and has been ultrasonic inspected.