User Manual for FLEX LB 125 18.0-EC Cordless Angle Grinder
Quick guide for the FLEX LB 125 18.0-EC cordless angle grinder. Includes technical specifications, key features, included accessories, and safety highlights.
Table of contents
Quick Guide
The FLEX LB 125 18.0-EC is a high-performance cordless angle grinder designed for professional use. This device features a brushless motor for increased efficiency and durability. Please note that the battery and charger are not included with the tool; it is compatible with all FLEX 18V battery systems.

Key Features
- Brushless Motor: Provides better performance and longer service life.
- Electronic Management System (EMS): Protects the machine, extends its service life, and increases efficiency.
- Electronic Brake: Stops the tool in approximately 3 seconds.
- Anti-Kickback: Automatically shuts off the motor if the disc becomes blocked.
- Soft Start: Ensures smooth acceleration during startup.
- Restart Protection: Prevents the tool from starting automatically after a power interruption.
- Tool-Free Adjustment: The protective guard can be adjusted without the need for additional tools.
- Ergonomic Design: Features a slim grip area with SoftGrip inserts and an angled auxiliary handle for comfortable handling.
- Dust Protection: Includes a removable metal dust guard for improved protection.
Technical Specifications
- Voltage: 18 V
- Battery Capacity: Compatible with 2.5 Ah, 5.0 Ah, and 8.0 Ah
- Max. Disc Diameter: 125 mm
- No-load Speed: 9000 rpm
- Spindle Thread: M14
- Dimensions (LxWxH): 330 x 75 x 120 mm
- Weight (without battery): 1.85 kg
Included Accessories
The following items are included in the delivery:
- 1 Grinding guard (436860)
- 1 Auxiliary handle (450774)
- 1 Clamping flange (335282)
- 1 L-BOXX transport case (414085)
- 1 Case insert (444405)
- 1 Clip-on cutting guard (534108)
- 1 Clamping nut M14 (534344)
- 1 Service wrench (483621)
Safety and Protection Systems
The tool is equipped with advanced electronic systems to ensure user safety and tool longevity:
- Overload Protection: Prevents damage during heavy-duty tasks.
- Temperature Control: Monitors the motor temperature to prevent overheating.
- Spindle Lock: Allows for quick and easy accessory changes.
Manufacturer information
FLEX
Practical help
Common problems
The overload protection or anti-kickback system may have triggered due to excessive pressure or a blocked disc. Release the switch and restart the tool.
Ensure the battery is fully charged and correctly inserted. Check if the restart protection is active following a battery change or power interruption.
Before use
- Ensure the battery is fully charged (battery not included).
- Check that the grinding disc is correctly mounted and the clamping nut is tightened.
- Verify the protective guard is securely attached and adjusted for the task.
- Ensure the auxiliary handle is firmly attached to the tool.
- Check the removable metal dust guard for debris.
Images and diagrams
- The product image displays the angle grinder with the auxiliary handle and protective guard installed, ready for operation.
Model compatibility
- Compatible with all FLEX 18V battery systems.
- Battery and charger are not included in the delivery.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.