... PTO Shaft: friction torque limiters, ratchet torque limiter, shear bolt torque limiter, etc Our factory is specialized in producing PTO ... ) for 6# BIDIRECTIONAL RATCHET TORQUE LIMITER (SA) for 4# and 2# UNIDIRECTIONAL RATCHET TORQUE LIMITER (RA) for 4# and 2 ... bore yokes, frictiontype torque limiters, ratchet type torque limiter, shear bolt torque limiter, etc.6.Plastic safety guard: black ,yellow,or ...