PERMCO 5/8-11 X 12-1/2 TIE BOLT

Yeah, 12-1/2 inches is the listed length on this one. That extended length is exactly what tandem and multi-section Permco pump configurations call for, where the bolt has to span across multiple housings and end plates to keep everything clamped and aligned. Single-section pumps typically run shorter bolts, so if you're working on a tandem unit, this length makes sense for that application.