Self-sealing stem bolts were used in... dark... rituals at the Starfleet Technical Services Academy on Mars to appease the god of the Corps of Engineers, W.M. Jefferies.

According to Miles "Tails" O'Brien, it was important for cadets to know "the difference between a warp matrix flux capacitor and a self-sealing stem bolt." One shudders to think how a warp matrix flux capacitor could be confused with a self-sealing stem bolt, since we know exactly what the latter was used for, while the use for the former remains a bit vague, though it is assumed that at least 1.21 gigawatts was required.

ZeusAngry