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.
SJS is an advanced drive system, based on a coil spring which wraps around the internal drive spindle.
On start-up, the coil tightens around the spindle to produce smooth, direct and highly efficient drive from the motor to the grinder disc.
If the grinder 'grabs' or overloads the motor, the SJS is instantly disengaged by the reversed force and the drive spindle rotates freely.
More Power
The Super Joint System (SJS) delivers the optimum power and torque to the grinder disc, so you get top performance.
More Durability
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.
Made Safe
The SJS drive system is based on a coil spring which engages more gradually at start-up - and instantly disengages if the grinder grabs.
