YASKAWA HW9381634-A – T-Axis Speed Reducer | Motoman Robot Drive Platform
Engineering Background
The T-axis (Tool axis / Wrist Roll axis) is the terminal rotational joint of a Motoman articulated robot arm, directly governing end-effector orientation and repeatability. Precision in this axis is non-negotiable for welding, assembly, and material-handling applications where angular deviation of even ±0.01° translates to scrap or rework. YASKAWA engineered the HW9381634-A as the OEM-specified speed reducer for this critical joint, delivering the torque density and backlash control demanded by 24/7 production environments.
Product Positioning
The HW9381634-A is a direct-replacement, factory-specification T-axis speed reducer sourced through verified industrial supply channels. It is stocked and dispatched by Konmask.com to minimize robot downtime for maintenance engineers and procurement teams worldwide.
Complete Technical Specifications
| Part Number | HW9381634-A |
| Manufacturer | YASKAWA Electric Corporation |
| Component Type | T-Axis (Wrist Roll) Speed Reducer / Gearbox Assembly |
| Compatible Platform | YASKAWA Motoman Industrial Robot Series |
| Axis Position | T-Axis (6th / Terminal Wrist Axis) |
| Reducer Type | Harmonic Drive / Cycloidal Precision Reducer (OEM spec) |
| Output Torque Rating | Per OEM datasheet (contact for model-specific values) |
| Backlash | <1 arc-min (OEM specification) |
| Lubrication | Pre-filled / sealed (grease-lubricated) |
| Mounting Interface | OEM bolt pattern – direct drop-in replacement |
| Operating Temperature | 0 °C to +40 °C (standard industrial) |
| Protection Class | IP54 (robot wrist environment) |
| Condition | New / Surplus New / Refurbished (specify at inquiry) |
| Country of Origin | Japan |
| Lead Time | In stock – ships within 1–3 business days |
Proven Application Environments
- Arc & Spot Welding Cells – Maintains torch angle precision through high-cycle duty
- Automotive Assembly Lines – Supports tight-tolerance fastening and part placement
- Material Handling & Palletizing – Reliable wrist roll under variable payload
- Machine Tending – Consistent orientation for CNC loading/unloading
- Painting & Dispensing – Smooth, backlash-free rotation for uniform coverage
- Electronics Assembly – Micro-positioning accuracy for PCB and component handling
Engineering Advantages
- OEM Part Number Verified – HW9381634-A is the factory-designated replacement; no cross-compatibility guesswork
- Zero Backlash Growth – Precision reducer design maintains repeatability over service life
- Drop-In Replacement – Identical mounting geometry eliminates re-calibration risk
- Pre-Lubricated & Sealed – Ready to install; no field lubrication required at commissioning
- Thermal Stability – Designed for continuous-duty industrial cycles without thermal drift
- Traceable Supply Chain – Each unit sourced with documentation supporting quality audit requirements
System Architecture & Signal Flow
In a Motoman 6-axis robot, servo motor torque is transmitted through the T-axis speed reducer to the wrist flange. The reducer multiplies torque while proportionally reducing speed, enabling the servo to operate in its optimal efficiency band. The HW9381634-A sits between the T-axis servo motor output shaft and the robot wrist flange, with the YASKAWA servo amplifier (SGDV/SGDH series) closing the position loop via encoder feedback. Correct reducer installation ensures the encoder zero-point and mechanical zero remain aligned, preserving the robot’s calibrated kinematic model.
Signal path: Servo Amplifier → T-Axis Servo Motor → HW9381634-A Speed Reducer → Wrist Flange → End-Effector
Sourcing & Quality Verification
- All units inspected upon receipt for physical integrity, seal condition, and part number legibility
- Packaging inspected for moisture ingress, impact damage, and storage compliance
- Batch traceability documentation available upon request for ISO 9001 / IATF 16949 audits
- Counterfeit-risk mitigation: sourced exclusively from authorized distributors and verified surplus channels
- Certificate of Conformance (CoC) available for qualified orders
Procurement Process
- Confirm Compatibility – Provide your Motoman robot model number (e.g., MA1400, HP20D, MH6) to verify HW9381634-A is the correct T-axis reducer for your unit
- Request Quote – Contact support@konmask.com with quantity, required condition (new/surplus/refurbished), and delivery timeline
- Order Confirmation – Purchase order accepted; proforma invoice issued within 24 hours
- Dispatch & Tracking – Ships via DHL / FedEx / SF Express with full tracking; export documentation included
- Incoming Inspection Support – Our technical team available to assist with installation verification and commissioning questions
Technical FAQ
Q: Which Motoman robot models use the HW9381634-A?
A: This reducer is used across multiple Motoman series. Please share your robot model and serial number for definitive confirmation.
Q: Is this a genuine YASKAWA part?
A: Yes. All units are sourced from verified supply channels with OEM part number HW9381634-A. Documentation is available upon request.
Q: Can I install this without re-calibrating the robot?
A: As a direct OEM replacement with identical geometry, re-calibration requirements are minimized. However, YASKAWA recommends verifying zero-point after any wrist component replacement.
Q: What is the warranty?
A: Warranty terms vary by unit condition. Contact us for details applicable to your order.
Q: Do you ship internationally?
A: Yes. We ship globally with full export documentation, including commercial invoice, packing list, and country of origin certificate.
Q: What is the lead time for bulk orders?
A: In-stock units ship within 1–3 business days. For bulk procurement, contact us for availability and lead time confirmation.
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