Makita GA5042C SJSII 5-Inch Industrial Variable-Speed Grinder

The Makita GA5042C SJSII 5-Inch Industrial Variable-Speed Grinder combines power, operator comfort and motor-protection features for demanding cutting, grinding and surface-preparation applications.

Its powerful 12-amp motor delivers a variable-speed range of 2,800 to 11,000 RPM. The speed-control dial allows the operator to match the tool's speed to the application, while constant-speed control applies additional power to help maintain speed under load.

The SJSII mechanical gear-drive system is designed to help protect the motor and gears by dampening the force created when the wheel is forced to stop. Its leaf-spring and cam-gear mechanism also helps reduce vibration during extended use.

Typical Applications

• Cutting
• Grinding ferrous metal
• Paint removal
• Rust removal
• Shipyard maintenance
• Metal polishing
• General steel grinding
• Automotive repair work
• Cutting brick and masonry
• Restoration work

Advantages

• Powerful 12-amp motor
• Variable-speed range from 2,800 to 11,000 RPM
• Variable-speed dial allows the operator to match the speed to the application
• SJSII mechanical gear-drive system helps protect the motor and gears
• Leaf-spring and cam-gear mechanism helps reduce vibration
• Vibration-absorbing side handle improves operator comfort
• Constant-speed control helps maintain speed under load
• Soft-start control helps reduce startup reaction
• Electronic current limiter helps protect the motor from overload
• Labyrinth construction helps protect the motor and bearings from dust and debris
• Enlarged motor-fan fins increase airflow for cooler operation
• Zig-zag epoxy and field powder coating help protect internal components from debris
• Spiral bevel gears provide smoother rotation and efficient energy transfer
• Aluminum gear housing supports gear alignment and smooth transmission
• Tool-free wheel guard allows convenient adjustment
• Slide switch with lock-on supports continuous operation

Specifications

• Brand: Makita
• Model: GA5042C
• Product type: Industrial variable-speed angle grinder
• Wheel size: 5 inches
• Motor: 12 amps
• Speed range: 2,800 to 11,000 RPM
• Drive system: SJSII mechanical gear drive
• Speed control: Electronic constant-speed control
• Startup control: Soft start
• Overload protection: Electronic current limiter
• Motor protection: Labyrinth construction, zig-zag epoxy and field powder coating
• Gear type: Spiral bevel
• Gear housing: Aluminum
• Wheel guard: Tool-free adjustment
• Switch: Slide switch with lock-on
• Side handle: Vibration absorbing

Motor and Gear Protection

• SJSII helps dampen impact when the wheel is forced to stop
• Labyrinth channels help prevent dust and contamination from entering the motor
• Zig-zag epoxy protects both sides of the armature coil
• Powder coating protects the field from dust and debris
• Enlarged motor-fan fins increase airflow
• Electronic current limiter helps protect against overload in high-torque applications

Frequently Asked Questions

What is the speed range of the Makita GA5042C?

The grinder provides a variable-speed range from 2,800 to 11,000 RPM.

What does the SJSII system do?

The SJSII mechanical gear-drive system helps protect the motor and gears by dampening force when the wheel is forced to stop. It also helps reduce vibration during use.

Does the grinder maintain speed under load?

Yes. Electronic constant-speed control applies additional power to help maintain operating speed under load.

Does the grinder have soft start?

Yes. The soft-start system is designed to reduce startup reaction and support smoother operation.

How is the motor protected from dust and debris?

The grinder uses labyrinth construction, zig-zag epoxy on the armature coil and powder coating on the field to help protect internal components.

Can the wheel guard be adjusted without tools?

Yes. The wheel guard is designed for tool-free adjustment.

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