SH bushings are designed for heavy loads - for both torque and axial forces. SHR bushings, delivered with a non-slotted outer sleeve, are for use when welding components onto the bushing, e.g. a lever. SHT bushings, delivered with a slotted outer sleeve, lock the application by pressure and friction. SH bushings are entirely mechanical and have no temperature-sensitive hydraulic parts, so they can be used anywhere - even in extreme cold or heat.
