Hangzhou Xinabo Intelligent Electromechanical Technology Co., Ltd manufactures the XJ.533 21V Lithium-Ion Brushless Impact Wrench — 550N·m Torque, All-Purpose Cordless Power as part of the cordless tool range that supports our pipe fabrication and installation equipment. The XJ.533 is a 21V DC, 1/2-inch square drive impact wrench rated to 550 N·m, sized for M12–M24 bolted connections on structural steel, scaffolding, plant equipment and outdoor installations where a corded tool is impractical.
We build the tool around a high-power brushless motor and a durable impact mechanism intended for continuous operation rather than occasional use. Three torque gears, one-touch forward/reverse and built-in overload protection let a crew move between bracket bolts and larger structural fasteners with a single tool in hand. As a cordless power tool manufacturer working from our Hangzhou plant, we supply the XJ.533 as a standalone unit or as part of a mixed tool and battery order.
XJ.533 at a glance
- 550 N·m maximum torque, 1/2-inch square drive
- 0–3000 rpm no-load speed, 0–3800 bpm impact rate
- M12–M24 bolt range with three selectable torque gears
- Brushless motor, overload protection, power-off memory
- Battery, charger and portable carry bag supplied as standard
Specification and What Each Figure Means
The published ratings describe a working envelope, not a single operating point. Maximum torque is the peak the tool can deliver in its highest gear; the lower gears trade peak torque for control on smaller fasteners and on joints where the operator needs to feel the seat rather than drive through it.
| Parameter |
XJ.533 rating |
Practical meaning |
| Rated voltage |
21V DC |
Cordless operation on the 21V lithium-ion platform |
| Motor type |
High-power brushless |
No brush wear; suited to repeated fastening cycles |
| Max torque |
550 N·m |
Peak output for M12–M24 structural and equipment bolts |
| No-load speed |
0–3000 rpm |
Run-down speed before the impact mechanism engages |
| Impact rate |
0–3800 bpm |
Blow frequency that builds torque on seated joints |
| Square drive |
1/2 inch |
Standard impact sockets, extensions and adaptors |
| Bolt range |
M12–M24 |
Intended fastener envelope for the tool class |
| Torque settings |
3 adjustable gears |
Step-down control for smaller or softer joints |
Where the 550 N·m Class Fits
The XJ.533 is positioned as an all-purpose cordless wrench rather than a single-task tool. It covers the middle of the bolting range on most sites, which is why we supply it to contractors who need one wrench that travels between structural work, maintenance bays and remote installations.
Structural and scaffolding work
Steel structure bolt tightening, scaffolding assembly and large equipment installation, where fasteners sit in the M12–M24 band and access is by ladder or lift.
Workshop maintenance
Machine tool repair, production line maintenance and heavy machinery service, where a trailing cable is a trip hazard around moving equipment.
Outdoor and remote sites
Wind power equipment inspection, solar bracket installation and municipal facility repair, where power availability is the limiting factor.
Configuration Options Across Our Wrench Range
Torque class is the first decision, because it sets the fastener size a crew can work and the socket set they need to carry. The XJ.533 sits between our compact and high-torque models, and we quote the model that matches the bolting schedule rather than the largest available unit.
| Model |
Max torque |
Settings |
Typical fit |
| XJ.523 |
350 N·m |
4-speed |
Smaller fasteners, tighter access, general assembly |
| XJ.533 |
550 N·m |
3 gears |
M12–M24 all-purpose site and maintenance work |
| XJ.570 |
750 N·m |
1/2-inch drive |
Heavier structural bolting on the same battery platform |
| XJ.580 |
850 N·m |
3-speed |
Mid-duty high-torque work on large equipment |
Battery Platform, Charging and Runtime Planning
The XJ.533 ships with a battery, charger and portable carry bag as standard, so a crew can start work from the case. Runtime planning is part of the quotation conversation: the number of fasteners per shift, the charging window available on site and whether the crew already runs other 21V tools all change how many batteries belong in the kit.
- Standard kit: tool, battery, charger, carry bag
- Shared 21V platform with our brushless rotary hammers, hammer drills, grinders and saws
- Extended field work can be supported by the backpack lithium battery pack in 20Ah or 30Ah, which powers multiple 21V–60V tools
- Charging arrangements and spare battery quantities are agreed at order stage
Controls, Protection and Operator Safety
Control layout follows what a gloved operator can do without looking at the tool. One-touch forward/reverse switches direction for disassembly, the three-position gear selector sets the torque ceiling, and power-off memory returns the tool to its last setting after the battery is swapped.
- Overload protection cuts drive when the tool is pushed beyond its working range, protecting the motor and gear train
- Brushless motor removes brush dust and brush replacement from the maintenance schedule
- Reaction torque is highest on seated, corroded fasteners — operators should expect and brace for it on scaffolding and overhead work
- Impact-rated sockets and eye protection belong in the kit; standard chrome sockets are not intended for impact use
Installation, Commissioning and Maintenance
Commissioning is short but worth documenting. We recommend a torque check on a sample joint with a torque tester before the tool enters production use, so the gear setting that achieves the specified clamp load is recorded for the crew rather than guessed at the first bolt.
- Charge the battery fully and confirm the charger indicates completion
- Fit an impact-rated 1/2-inch socket and check engagement on the fastener
- Run a sample joint in each gear and verify against the specified torque
- Record the working gear, socket size and target torque on the method sheet
- Keep the impact mechanism and drive square clean; inspect sockets for cracking
Serviceability is deliberately straightforward: battery, charger, sockets and carry bag are consumable or replaceable items, and the brushless motor removes the most common wear part from the tool. Spare parts support is available for the products we supply.
Quality Control and Acceptance
Tools are assembled and function-checked before packing, and our production system covers incoming material control through finished-product inspection. For project orders we agree the acceptance points in advance so the receiving inspection matches what was ordered.
- Model, voltage and torque class confirmed against the purchase specification
- Accessory check: battery, charger and carry bag present and correct for the destination
- Function test: forward/reverse, gear selection, impact action, overload cut-out
- Torque verification on a sample joint where the project requires documented figures
- Packing and marking checked against the delivery scope
Information We Use to Configure Your Solution
A workable proposal needs the bolting schedule, not just a model number. The details below let us confirm the XJ.533 is the right class, size the battery and accessory kit, and prepare documentation that matches your acceptance process.
| Input |
Why we need it |
| Fastener sizes and grades |
Confirms the M12–M24 envelope and the socket set required |
| Target torque and joint type |
Sets the working gear and the acceptance check |
| Fasteners per shift and duty cycle |
Drives battery count and charging plan |
| Existing 21V tool fleet |
Keeps batteries and chargers common across the site |
| Access and working height |
Influences kit format, carry bag and tethering needs |
| Documentation and marking |
Matches packing lists, labels and receiving inspection |
Frequently Asked Questions
What does 550 N·m mean for an M12–M24 bolt?
It is the peak torque available in the top gear, which is enough headroom for the upper end of the M12–M24 range on structural and equipment joints. Smaller fasteners should be run in a lower gear so the operator keeps control of the seat rather than relying on the peak figure.
Can the XJ.533 replace a corded impact wrench on site?
For M12–M24 bolting on structures, scaffolding, plant and outdoor installations, yes — that is the application it is built for. Where a project specifies a documented torque value on every joint, the tool is used with a torque check on sample fasteners and the working gear recorded in the method.
What is the difference between the three torque gears?
Each gear sets a different torque ceiling and impact behaviour, so the same tool can drive a small bracket bolt and then a larger structural fastener without changing tools. Operators select the gear before run-down and the setting is retained after a battery swap through power-off memory.
What is included with each XJ.533?
The standard kit is the tool, one battery, a charger and a portable carry bag. Additional batteries, impact socket sets and the backpack battery pack for extended field work are added at order stage according to the duty cycle you describe.
Does the XJ.533 share batteries with other Xinabo tools?
It runs on our 21V lithium-ion platform, which also covers our brushless rotary hammers, hammer drills, angle grinders and circular saws. Standardising on one platform reduces the number of chargers and spare packs a crew carries, and the backpack pack can power multiple 21V–60V tools from a single carried supply.
How do we specify the wrench for a project order?
Send the bolting schedule, target torque, fasteners per shift, site charging arrangements and any documentation or marking requirements. We confirm the model and gear strategy, size the battery and accessory kit, and prepare the quotation with the delivery scope stated line by line.
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