The NAS6604H29 is a tension bolt (bolt, tension, hex head, close tolerance, alloy steel, long thread, reduced major diameter, self-locking and nonlocking, 160 KSI Ftu), manufactured to aerospace standards for aircraft applications. Alloy steel. Drilled head for safety wire. Undrilled shank, intended for use with self-locking nuts. Diameter: 1/4" Thread Pitch: 28 Thread Series: Fine Thread Length: Long Material: Alloy Steel Head: Drilled Head Shank: Undrilled Grip Length: 1-13/16" Tensile Strength: 160 KSI Ftu Structural Function: Tension Fit Tolerance: Close-Tolerance
