On the gear coupling with elastic covered pins, pins with elastic cover (rubber material) on one end are fit in convex flange holes of two half-couplings to realize the connection of the two half-couplings. Gear coupling with elastic covered pins was the coupling widely used in China, for which the Ministerial standard was set in 1950s. And JB08 — 60 coupling with elastic ring pins is the 1st coupling with Ministerial standard.