Hangzhou Xinabo Intelligent Electromechanical Technology Co., Ltd is the XJ.918 21V Lithium-Ion High-Magnetic Brushless Angle Grinder (Heavy-Duty) — 125mm Disc, 30mm Cutting Depth manufacturer, supplying cordless cutting and grinding tools to fabrication shops, fire-protection contractors, plant maintenance teams and equipment distributors. The XJ.918 is the heavy-duty 125mm model in our 21V cordless line, built around an upgraded high-magnetic brushless motor with three speed stages and a 30mm maximum cutting depth.
We assemble it for crews that cut structural steel, dress welds and grind stone or concrete without running a mains lead across the work area. Each unit leaves our factory in Hangzhou, Zhejiang as a working kit — dual batteries, fast charger, guard, extended side handle and hard storage case — so it can enter service on arrival.
- Steel structure cutting, metal profile cutting and rebar work
- Weld dressing, weld polishing and heavy workpiece grinding
- Large stone grinding, road repair and concrete edge work
- Equipment repair in agriculture, mining and general industry
Position in Our 21V Brushless Grinder Range
Our cordless angle grinder range covers two disc sizes so that a site can standardise on one battery platform. The XJ.908 100mm brushless angle grinder handles lighter cutting, grinding and polishing where access is tight; the XJ.918 adds a 125mm disc and 30mm cutting depth for heavier sections and longer grinding passes.
- XJ.918 (this model): heavy fabrication, structural steel, mould processing, plant and mining equipment repair
- XJ.908: 100mm disc, general cutting and finishing where a compact body is needed
- Adjacent cutting tools: the XJ.853 140mm brushless circular saw for straight cuts in sheet and profile, with the grinder covering abrasive cutting and finishing
Specifications and What Each Figure Means on Site
The published parameters below are the basis for our configuration discussions. Where a job depends on a value not listed here, we confirm it against the build before quoting.
| Parameter |
XJ.918 value |
Practical meaning |
| Rated voltage |
21V DC |
Shared battery platform across our 21V cordless tools |
| Motor type |
Upgraded high-magnetic brushless |
No carbon brushes to replace; output held under sustained load |
| Disc diameter |
125mm |
Standard 5-inch consumables; deeper reach than a 100mm body |
| No-load speed |
0–10,000 rpm, 3 adjustable gears |
Speed stage matched to disc type and material |
| Cutting depth |
30mm maximum |
Cuts heavier sections and thicker plate in fewer passes |
| Functions |
Cutting / grinding / polishing |
One body covers three site operations |
| Safety features |
Anti-kickback, anti-lock, safety guard switch |
Restart and jam protection during edge and overhead work |
| Standard accessories |
Extended side handle, guard, dual batteries, fast charger, hard storage case |
Complete working kit; discs specified separately |
Three Speed Stages Across Cutting, Grinding and Polishing
The three-stage control lets one tool cover operations that would otherwise need separate machines. Operators set the stage to suit the disc and the material rather than running everything at maximum speed.
- Cutting: run at the higher stages with a bonded cut-off wheel for steel sections, pipe and rebar
- Grinding: mid to high stages with a depressed-centre disc for weld removal and heavy stock reduction
- Polishing and finishing: lower stages with flap or wire discs to control heat and surface finish
- The intelligent control system manages output across the stages so the motor is not overloaded in continuous work
Safety Systems for Overhead, Edge and Confined Work
Grinding is one of the higher-risk operations on a fabrication site, so the XJ.918 carries fourfold safety protection alongside mechanical safeguards. The vibration-damping anti-slip body design keeps control during long grinding passes, and the extended side handle allows a two-handed grip on heavy workpieces.
- Anti-kickback: limits reaction force if the wheel binds in a cut
- Anti-lock: protects the motor and the operator when the disc stalls
- Safety guard switch: the tool will not run with the guard incorrectly positioned
- Guard and handle: supplied as standard and must remain fitted for all cutting and grinding
Battery, Charging and Delivery Scope
The XJ.918 ships with two battery packs and a fast charger, which lets one pack charge while the other works. Runtime depends on the disc, the material and how hard the tool is pushed, so we size battery quantities against the shift pattern rather than quoting a single figure.
- Dual batteries and fast charger included as standard, with a hard storage case for transport and site storage
- For crews needing longer runtime between charges, our backpack lithium battery pack powers multiple 21V–60V tools as a separate system
- Charger input configuration is confirmed per destination before the order is released
- Consumable discs are not part of the standard kit; they are specified against the material being worked
Matching Discs to Material
Disc choice determines cut quality, heat input and how long the motor runs at peak. The combinations below reflect how the tool is normally applied in fabrication and maintenance work.
| Work type |
Typical 125mm disc |
Operating note |
| Structural steel and profile cutting |
Bonded cut-off wheel |
Clamp the section and let the wheel reach full speed before contact |
| Weld dressing and blending |
Flap disc or depressed-centre grinding disc |
Use the mid to high stages and keep the guard indexed |
| Heavy workpiece grinding |
Depressed-centre grinding disc |
Two-handed grip on the extended side handle |
| Stone, concrete and road repair |
Diamond blade |
Match the blade to dry or wet cutting and control dust |
| Rust, paint and scale removal |
Wire or flap disc |
Lower stage to limit heat build-up in thin sheet |
Quality Control, Documentation and Acceptance
Our production is supported by a 10,000 m² factory, in-house assembly and finished-product checks before packing. Units are run through all three speed stages without load, the guard and switch are operated, and the accessory set is counted against the packing list.
- Certification file includes a Machinery Directive and Electromagnetic Compatibility Directive attestation of conformity
- Company holds the National High-Tech Enterprise title alongside invention, utility model and design patents
- Acceptance can be arranged against an agreed checklist covering speed stages, safety devices and kit contents
- Documentation language, labelling and packaging format are agreed at order stage
Information We Use to Configure Your Solution
A proposal is built from the working point, not from a catalogue line. The details below let us confirm the model, kit content and quantity split in one pass.
- Material, section thickness and the deepest cut required against the 30mm limit
- Mix of cutting, grinding and polishing in the working day, and the discs already in use
- Number of operators, shift length and how many battery packs each crew needs
- Charger input voltage and plug standard for the destination
- Spare parts kit, documentation language, packaging and delivery scope
Maintenance, Spare Parts and Serviceability
Because the motor is brushless, there are no carbon brushes to inspect or replace, which removes the most common scheduled service item on a corded grinder. Day-to-day attention focuses on airflow, the guard and the battery packs.
- Clear the air vents after dusty stone or concrete work to protect motor cooling
- Check the guard clamp, side handle fixing and disc condition before each shift
- Store battery packs away from heat and recharge before long idle periods
- Spare guards, side handles, batteries, chargers and switches are supplied from our spare parts range
Frequently Asked Questions
What can the XJ.918 cut with a 125mm disc?
With the correct wheel it cuts structural steel, rebar, pipe, profile and sheet, and with a diamond blade it cuts stone and concrete. Maximum cutting depth is 30mm, so deeper sections are cut from both sides or rotated.
Does the grinder arrive ready to use?
Yes. The standard kit contains two battery packs, a fast charger, the guard, an extended side handle and a hard storage case. Consumable discs are ordered separately so the correct type is supplied for your material.
How long does one battery pack last?
Runtime depends on the disc, the material and the speed stage used, so we size battery quantities against your shift pattern instead of quoting a single number. Two packs are supplied as standard, and our backpack battery pack is available where longer runtime is needed.
Can the XJ.918 be used on stainless steel?
It can, provided a disc dedicated to stainless steel is used and kept separate from discs used on carbon steel. This avoids iron contamination that leads to surface rust on finished stainless work.
What support is available after delivery?
Our technical team provides product familiarisation for buyer partners on request, and spare parts including guards, handles, batteries and chargers are supplied from our range. Service terms are agreed with the order.
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