SRA166 Six-axis robotic arm (manipulator)
166kg / 2654mm
SRA166 Specifications
Nachi-Fujikoshi (NACHI) SRA166 spot welding robot, with a payload of 166kg and a reach of 2654mm.
Model introduction
SRA166: Rated load 166kg · Maximum reach: 2654mm · Repeat positioning accuracy± 0.1mm · Number of axles: 6 axes · Main body weight: 1060kg. Specifications are sourced from the official Nachi-Fujikoshi (NACHI) website.
SRA Series Spot Welding Robots · Series technical features
100-250kg · Automotive welding
Originating from the world's first servo motor spot welding robot in 1979.
SRA100J Short-arm high-speed design, SRA210/250 long arm covers large welding areas.
Wrist space supports welding machine cable packs, ensuring stable beats.
SRA Series Spot Welding Robots · Other models in the same series
Compare load and reach to choose the model that best suits your process.
SRA166 model positioning and working condition adaptation
SRA166 This is an industrial robot model belonging to the Nachi-Fujikoshi SRA series spot welding robots, with a rated load of 166kg, a motion radius of 2654mm, and a repeat positioning accuracy of ±0.1mm. Nachi-Fujikoshi's technical foundation is represented by Japanese compact models: the MZ series of low-load, high-speed models excel in lightweight arms and rhythmic beats; The control platform is the FD series controllers (FD8/FD11, etc.), and the program ecosystem is EX language + teach pendant.
From the perspective of working condition adaptation, the typical use for positioning large loads (166kg) is thisIntegrated palletizing, die-casting and part-picking, heavy handling and weldingThe extra-long reach (2654mm) suits large workpieces and cross-line service, but watch stiffness and vibration at full extension. Repeatability of ±0.1mm meets handling and palletizing requirements; for precision assembly, add vision guidance for closed-loop positioning. Under heavy loads, foundation bearing capacity and base-bolt tightening torque are mandatory checks at installation acceptance; cycle time degrades noticeably when inertia ratios exceed limits.
| Parameters | Engineering interpretation and usage recommendations |
|---|---|
| Rated load: 166kg | It is recommended to reserve a load margin of 20%–30%; Verification is made by combining end self-weight + workpiece + imbalanced load inertia, especially sensitive to high-speed conditions |
| Movement radius: 2654mm | Determine the radius of the work unit layout: bins, tooling, and fences are bounded by maximum arm span + safety distance; Verify the accessibility of each pick-and-place point during cross-station service |
| Repeat positioning accuracy: ±0.1mm | Repeatability ≠ absolute accuracy: Precision assembly requires external measurement closed-loop or visual guidance; Long-term accuracy trends rely on annual retest management |
| Number of axes: 6 | Six-axis all-posture capability, the preferred choice for complex trajectory and inclined surface operations |
| Main body weight: 1060kg | Installation base and foundation load-bearing check based on weight + dynamic load; Floor slab installation requires structural calculation, with heavy-duty models serving as independent foundations |
| Controller: FD series controllers (FD8/FD11, etc.) | Decide on the process ecosystem, spare parts channels, and second-hand residual value; Currently, spare parts channels are smooth, and repair and upgrade paths are mature |
Control systems and common failure modes
The SRA166 supports the FD series controllers (FD8/FD11, etc.), with the programming language and development environment being EX language + teach pendant. Maintenance of this generation of control platforms focuses on three basic components: power, storage, and cooling—most "sudden downtime" can be detected in advance when preventive maintenance is in place.
| Failure mode | Typical performance | Disposal recommendations |
|---|---|---|
| Driver alarm and power unit aging | Driver alarm and power unit aging | Included as a mandatory inspection item for annual maintenance, with spare parts stocked in advance |
| The encoder battery is depleted | Encoder battery depleted (origin lost) | Initial interpretation of alarm codes by reference with manuals, remote diagnosis allows for early positioning |
| Teach pendant cable core breakage | Teach pendant cable core breakage | Daily inspection coverage, with abnormal trends (abnormal noises/temperature rise/errors) recorded |
| Reducer lubrication deterioration | Reducer lubrication deterioration (temperature rise at high speeds) | Quarterly dust removal maintenance and cabinet temperature monitoring |
| Maintenance projects | Cycle recommendations | Key points |
|---|---|---|
| Battery Annual Replacement (Powered Operation) | Year | Battery Annual Replacement (Powered Operation) |
| High-speed model reducer grease is managed according to shortened cycles | According to the manufacturer's manual cycle | High-speed model reducer grease is managed according to shortened cycles |
| Quarterly inspection of control cabinet fans | Quarterly | Quarterly inspection of control cabinet fans |
| Cable and drag chain inspection | every six months | Insulation, shielding, and bending radius inspection of power and encoder lines, as well as wear of cables inside the drag chain, are the main causes of intermittent faults |
| Zero point and accuracy retest | Every year | Repeatability measured by dial gauges or laser trackers, drift trend digitization—accuracy degradation can be seen six months in advance |
| Control cabinet dust removal and fans | Every quarter | Filter cleaning, fan speed and noise checks, cabinet temperature recording; Dust environments shorten the cycle |
Henghuan's service capabilities for SRA166
We are a third-party robot technical service provider. For the SRA166 we offer the following eight services, ordered by how often they are actually needed for this model:
- Maintenance and repair: on-site diagnosis, board-level repair and annual maintenance contracts for the SRA166 — brand-specific items such as annual battery replacement (live-powered operation) are performed per our SOPs; same-day response within Sichuan and Chongqing.
- Second-hand and inventory robot sales: the used MZ series trades steadily — a high-value Japanese-brand choice for high-speed sorting and machine loading; in-stock SRA166 or equivalent models come with a full-function inspection report and a 12-month warranty.
- Sales of new industrial robots: When adding new production lines or replacing entire batches, we conduct cross-brand selection comparisons based on process requirements (including Nachi-Fujikoshi models of the same class) and provide configuration and pricing plans.
- Applied technology services: process programming, path optimization, cycle-time tuning and changeover recipe management for the SRA166, commissioned specifically for full-pallet palletizing, die-casting part extraction, heavy-duty handling and welding.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety fences for SRA166, with interfaces designed according to Chifujietsu flange and IO standards.
- Robot rental: for short-term capacity needs or process validation, you can rent an in-stock SRA166-class model, with transport, installation and commissioning included; rental terms are flexible and the unit can be purchased at the end of the lease.
Common issues with this device
Is it easy to find SRA166 spare parts?
Nachi-Fujikoshi: Spare parts channels for this generation are smooth; we have in-stock or short-cycle channels for regular parts such as drivers, power modules, batteries, and teach pendant components; It is recommended to allocate consumables for annual battery replacement (live operation) according to the annual maintenance contract.
With a nominal load of 166kg, how much can it actually handle?
The rated load is the static load limit of the flange surface. In actual selection, three factors must be considered: the self-weight of the end fixture (vacuum suction cup groups or grippers often account for 2–5kg), the inertia generated by the workpiece offload (checked according to the inertia ratio when the center of gravity deviates from the flange center), and the dynamic load during high-speed movement. The conventional engineering practice is to keep the "end + workpiece" within 70%–80% of the rated value to ensure cycle time and service life.
If the equipment's accuracy deteriorates after several years of use, how can it be restored?
According to the inspection order: first check whether the zero point is drifting (common after collision or battery depletion), then perform zero calibration; Check the reducer's return error (actual measurement of forward and reverse positioning deviation; if exceeded, disassemble or replace); Then check the installation base fastening and foundation settlement; Finally, trajectory compensation parameter restructuring. Most accuracy issues can be mostly restored after calibration and maintenance, so there is no need to rush into major repairs—we first release the inspection data before deciding on the plan.
Is the used SRA166 worth buying?
The MZ series is a Japanese choice for stable second-hand circulation, offering high speed sorting and cost-effective loading and unloading conditions. Three essential items for second-hand procurement: comprehensive inspection reports (axial accuracy, driver status, insulation and battery), maintenance history and operating hours, controller generation, and software license integrity. Every used machine we sell comes with inspection records and a 12-month warranty, and we can also accept third-party inspections designated by customers.
Need technical support or procurement for this model?
Whether it's model selection comparison, installation and commissioning, or maintenance of in-use equipment, you can contact Henghuan. Tell us about your processes, loads, and equipment status, and we will provide third-party technical support and solution recommendations.
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