Hangzhou Xinabo Intelligent Electromechanical Technology Co., Ltd builds pipe fabrication and installation equipment — intelligent threading machines, pipe tightening machines, cold saws, pressure test pumps — and a cordless power tool platform that supports the same site crews. Fire protection, construction and industrial maintenance contractors use our tools where a pipe run, a steel frame and a machine base all have to be finished on the same visit.
As the XJ.523 21V Lithium-Ion Brushless Impact Wrench (Heavy-Duty) — 350N·m Torque, 4-Speed Adjustable manufacturer, we supply the tool as a complete working kit: two 21V batteries, a fast charger and a hard storage case, so a crew can put it into service without sourcing packs separately. Tools are assembled and packed at our works in Hangzhou, Zhejiang, China.
Heavy-Duty Bolting on a Shared 21V Platform
The XJ.523 is the heavy-duty entry in our Lithium-Ion Brushless Wrench range. A 1/2-inch square drive, a high-power brushless motor and four selectable torque stages let one tool cover M8 to M22 bolting — from truck wheel nuts to steel frame connections — without changing platforms between jobs.
All 21V tools in the range share the same battery interface, so a site running the XJ.523 can add a rotary hammer, angle grinder or circular saw without a second charging infrastructure.
What the XJ.523 Specifications Mean on Site
Each figure below drives a practical decision — socket selection, joint strategy, battery rotation or cycle time. We quote the tool against the working point, not against a single headline number.
| Parameter |
XJ.523 Rating |
Practical Meaning |
| Rated voltage |
21V DC |
Shared platform with other XJ 21V tools and packs |
| Motor type |
High-power brushless |
No brush wear parts; torque holds up under repeated impact |
| Max torque |
350 N·m |
Breaks rusted and seized fasteners across the stated bolt band |
| No-load speed |
0–3200 rpm |
Fast run-down before the impact mechanism engages |
| Impact rate |
0–4000 bpm |
High blow frequency seats fasteners quickly in hard joints |
| Square drive |
1/2 inch |
Standard impact sockets, extensions and adaptors |
| Bolt range |
M8–M22 |
Structural, machine and vehicle bolting in one tool |
| Torque settings |
4 adjustable gears |
Step down for small fasteners, soft joints or finish work |
| Standard accessories |
Dual batteries, fast charger, hard case |
One pack on the tool, one on charge, continuous shift coverage |
Four Torque Settings Across an M8–M22 Bolt Range
The four-stage selector is a power control, not a calibrated torque wrench. It lets the operator match output to fastener size and joint condition, then verify final torque separately where the specification demands it.
- Low stages — M8 to M12 fasteners, plastic or sheet assemblies, and finish work where a full-power blow would distort the part.
- Mid stages — M12 to M18 machine mounts, brackets and general maintenance, with enough reserve to seat a clean thread without over-running.
- Top stage — M18 to M22 wheel nuts, structural bolts and seized fasteners, where the full 350 N·m and 4000 bpm are needed.
- Forward/reverse — one-touch switching, so a rusted nut can be worked back and forth with penetrating oil instead of shearing.
For structural connections, we recommend the tool for run-down and seating, followed by a torque wrench to the specified value. That split keeps cycle time short and the acceptance record clean.
Application Fit
The XJ.523 was specified for work where fasteners are large, access is awkward and the joint has often corroded in place.
| Application |
Typical Task |
Configuration Note |
| Heavy vehicle repair |
Truck and construction machinery tyre removal, chassis bolts |
Top stage with deep impact sockets; two packs for multi-wheel jobs |
| Heavy steel structure |
Steel frame bolt tightening, bridge maintenance |
Run-down and seating, then torque wrench verification |
| Wind power installation |
Flange and tower bolting at height |
Cordless operation, hard case for transport, lanyard discipline |
| Mining and agricultural machinery |
Seized fastener removal, field repair |
High impact rate plus rocking technique on corroded threads |
| Large machine overhaul |
Assembly and disassembly inside frames |
Compact body with 1/2-inch extensions and universal joints |
Brushless Motor, Battery Platform and Runtime
The brushless motor removes the carbon brush service interval and keeps torque consistent as the pack discharges. Because the tool shares the 21V interface, packs already bought for our rotary hammers and grinders work here.
- Two batteries ship in the case, so one pack charges while the other works.
- The fast charger returns a pack to service between wheel stations on a truck job.
- For continuous bolting on a fixed station, our Backpack Lithium Battery Pack — 20Ah/30Ah for 21V-60V tools extends runtime without returning to a charger.
- Store packs at moderate temperature; avoid leaving them in a closed vehicle cab in direct sun.
Control, Safety and Operator Protection
An intelligent control board monitors the tool while it runs and applies fourfold protection against the operating faults it detects. The anti-slip, vibration-damping body treatment keeps the grip secure when the impact mechanism loads up.
- One-touch forward/reverse keeps direction changes fast during seized-fastener work.
- Reaction torque is real at 350 N·m — brace the tool with both hands and avoid one-handed use on ladders or scaffolding.
- Impact sockets only; chrome hand sockets can crack under impact load.
- Eye and hearing protection are required, and gloves should fit closely around the drive area.
Build Checks, Delivery Scope and Acceptance
Every XJ.523 is assembled and function-checked before it goes into the case. The routine covers the points that decide whether the tool performs on the first shift.
- No-load speed and impact function verified against the rated figures.
- Four-stage selector detents and one-touch forward/reverse confirmed.
- Battery and charger pairing tested on the shipped set.
- Case contents checked: tool, two batteries, fast charger, hard storage case.
- Serial and lot marking applied for fleet registration and spare-part traceability.
On receipt, run one pack through a charge cycle, fit a known socket and confirm all four stages on a test fastener before releasing the tool to site.
Installation, Charging and Maintenance
There is no line connection, no air supply and no commissioning procedure beyond the battery. That is the point of the platform on sites where a compressor or a 230V feed is not available at the workface.
- Charge both packs fully before first use and confirm the charger voltage and plug type for the destination market.
- Keep the square drive and socket bores clean; a worn socket wastes torque and rounds fastener heads.
- Check the anvil and retaining ring periodically and replace worn impact sockets rather than dressing them.
- The brushless motor needs no brush replacement; service attention concentrates on the impact mechanism, switch and battery contacts.
- Store the tool in the supplied hard case with the pack removed for long idle periods.
Information We Use to Configure Your Solution
We prepare the XJ.523 offer against the actual bolting task, so the quotation matches the work rather than a generic kit.
- Fastener sizes, property class and target torque, plus how final torque is verified.
- Joint condition — new, painted, galvanised or corroded — and whether access is open or confined.
- Duty cycle per shift and how many operators will share the tool.
- Socket, extension and adaptor requirements, and whether a second battery set is needed.
- Existing 21V packs in your fleet, charger plug standard, labelling language and packaging format.
- Quantity, delivery schedule and any site acceptance documentation you require with the shipment.
Frequently Asked Questions
Is 350 N·m enough for M22 fasteners?
It depends on the property class and the specified torque. The XJ.523 covers M8–M22 in the range and handles most M16–M20 assembly work comfortably. Where an M22 fastener in a high class needs more than 350 N·m, we recommend stepping up to the 750 N·m XJ.570 or the 850 N·m XJ.580.
Can the four gears be used as torque settings?
They are power stages that control output, not calibrated torque values. Use them to match the tool to fastener size and joint condition, then confirm final torque with a torque wrench where the specification requires a recorded value.
What is included with each tool?
The standard kit is the wrench, two 21V batteries, a fast charger and a hard storage case. Sockets and extensions are selected separately against your fastener sizes and can be included in the quotation.
Do the batteries fit other Xinabo tools?
Yes. The XJ.523 uses our 21V battery interface, shared with the brushless rotary hammers, angle grinders, circular saw and other 21V tools in the range, so packs and chargers can be pooled across a site.
How do we handle charger voltage and plug type for our market?
Charger specification is confirmed at quotation stage against the destination market, together with labelling language and packaging format, so the shipment arrives ready for your warehouse or site delivery.
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