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Koki Holdings Co.,Ltd.


125mm (5") Electronic Disc Grinders


125mm (5") Disc Grinder

Disc Grinders : G13BY/G13YG/G13BA
  • User Vibration Protection
  • Power
Heavy Duty 1,700W Motor (G13BY & G13YG)
  • Comfort
Image of the auto-balancer User Vibration Protection System for Less User Fatigue
Delivers less hand-arm vibrations thanks to the integrated auto-balancer and anti-vibration side handle.

The balls in the auto-balancer move and even out the imbalance of the grinding disc, greatly reducing vibrations.

Soft Start for Reduced Start-Up Reaction (G13BY & G13YG)
  • Convenience
Image of the wheel nut Tool-less Disc Change System for Ease of Use
The wheel nut can be loosened and tightened by hand: when the push button is pressed just before the grinding disc stops after switch-off, the wheel nut loosens itself by around half a turn and can be removed without additional effort or tools.

Note: Make sure to use a genuine wheel nut designed for the model.

Tool-less Wheel Guard Adjustment for Increased Versatility Tool-less Wheel Guard Adjustment for Increased Versatility
Allows a user to turn the guard around by pushing a lever.
  • Safety
Fast Brake System for High User Protection Fast Brake System for High User Protection (G13BY & G13BA)
Mechanical brake stops the disc within 2 seconds after switching off.

Slip Clutch for More User Safety Slip Clutch for More User Safety
Ensures reduced kickback when the disc jams unexpectedly.

Anti-Restart Protection for Accident Avoidance
Prevents unintentional restart of the tool.

Overload Protection for Longer Service Life (G13BY & G13YG)
The load speed decreases when there is too much load on the tool.

Electronic signal indicator Electronic Signal Indicator (G13BY & G13YG)
The display lights up when the overload protection is activated and it flashes when the restart protection is active.


Model G13BY G13YG G13BA
Capacity Wheel Dia. 125mm (5")
Hole Dia. 22.23mm (7/8")
Thickness 6mm (1/4")
Spindle Thread M14 x 2
Power Input 1,700W 1,250W
No Load Speed 11,000/min.
Overall Length 335mm (13-3/16") 315mm (12-13/32") 335mm (13-3/16")
Weight* 2.8kg (6.2lbs.) 2.7kg (6.0lbs.)
Standard Accessories Side Handle, Wheel Guard
*Weight: According to EPTA-Procedure 01/2003.

Optional Accessories

Part Name Code No.
Dust Protection Filter Polishing Sponges(Dia. 160mm)
Detachable dust filter protects the motor from coarse particles.
Cutting Guard Clip Lamb Fleece Polishing Disc(Dia. 150mm)
Designed to simply attach to the existing guard.
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