Texas Pneumatic Tools backhead bolts offer strong clamping force with the combination of nuts to create a strong bolted joint between the backhead and the driver chunk in tools like hammer drill. These units come with hexagonal heads that can be rotated from any angle for loosening or tightening in tight spaces with the help of a wrench. When mated with the compatible nuts, these bolts provide extra friction to resist unwinding due to external forces. Selected models come with nut and washer assembly for equally distributing the load of bolt and preventing self loosening due to vibrational effects.