On Jun 28, 7:37*am, John Husvar wrote:
...
They're 8mm Socket Head Machine Screws with a section of threads ground
off to the minor diameter, leaving about 5-6mm of thread at the tip and
about 10mm at the head end. The threads engage at both the tip and head
ends.

They're used on the front seat mounts of a Sunrise Medical Rhythm power
wheelchair with a certain seating system....


Does that captivate the bolt when the seat is removed?

jsw