SJS is a massive advance in power, safety and durability.
The design gives maximum transfer of power and torque, while minimising the wear and tear that happens with older technology. Plus it disengages under extreme loads, protecting the user and the machine.
…and it’s only inside Makita high powered angle grinders.
The Super Joint System (SJS) delivers the optimum power and torque to the grinder disc, so you get top performance.
SJS means greater durability. The way SJS engages means the motor and gears are protected from shock at start-up or if the grinder grabs.
The SJS drive system is based on a coil spring which engages more gradually at start-up - and instantly disengages if the grinder grabs.