Type ST (for light loads)
   This is a type for light loads, with which a long stroke length can be obtained.

Seal type (ST...UU/ST...UUB)
   Special synthetic rubber seals have been installed on both sides of the sleeve to prevent entry of foreign matter into the inside and to prevent grease leakage. When it is desired to reduce the seal resistance, felt seals (type ST...DD, type ST...DDB) also are available.

Type ST...B (for medium loads) 
   This type has the same dimensions as the type ST, but the stroke length has been reduced while the load rating has been doubled for this type for medium lo9ads.

Type STI with inner ring
   When hardening of the shaft is not possible, use with an installed inner ring also is possible. Inner rings are manufactured on request.