Robotics & Precision Automation Solution — Harmonic Drive CSF-25-160 | CSF Series
Where This Product Is Used
The Harmonic Drive CSF-25-160 is a high-precision strain wave gear component set (flex spline + wave generator) engineered for demanding motion control applications. Engineers specify this unit across the following industries and machine types:
- Industrial Robotics — Joint actuators in 6-axis articulated arms (FANUC, KUKA, ABB, Yaskawa), SCARA robots, and collaborative robots (cobots) where zero-backlash torque transmission is critical.
- CNC Machining Centers — Rotary table drives, B/C-axis positioning, and tool-changer indexing mechanisms requiring arc-second-level repeatability.
- Semiconductor & FPD Manufacturing — Wafer-handling robots, reticle stages, and vacuum-compatible end-effector joints in cleanroom environments.
- Medical & Surgical Robotics — Minimally invasive surgical arms and imaging gantry drives where compact form factor and smooth motion are non-negotiable.
- Aerospace & Defense — Antenna positioning systems, gimbal drives, and UAV actuators requiring high torque-to-weight ratio.
- Automated Optical Inspection (AOI) — High-speed rotary stages and lens-positioning axes in vision systems.
Technical Specifications
- Model: CSF-25-160
- Series: CSF (Component Set — Flex Spline Type)
- Reduction Ratio: 160:1
- Frame Size: 25 (nominal bore/flange diameter class)
- Rated Torque: 34 N·m (continuous), 108 N·m (peak)
- Maximum Input Speed: 3,500 rpm
- Backlash: ≤1 arc-min (zero-backlash under preload)
- Positioning Accuracy: ≤30 arc-sec
- Efficiency: ≥75% at rated load
- Lubrication: Grease-lubricated (Harmonic Grease SK-1A compatible)
- Operating Temperature: −10 °C to +70 °C
- Weight: ~323 g (component set)
- Condition: Tested / Inspected
Why Engineers Specify This Model
- Zero Backlash — Strain wave meshing eliminates gear lash, enabling sub-arc-minute positioning without software compensation.
- High Reduction in Single Stage — 160:1 ratio in a compact envelope replaces multi-stage gearboxes, reducing system complexity and weight.
- Coaxial Input/Output — Simplifies mechanical integration versus planetary or worm gear alternatives.
- Proven Reliability — Harmonic Drive CSF series is the OEM-specified reducer in leading robot brands globally; MTBF exceeds 10,000 hours under rated conditions.
- Tested Unit — This specific unit has been functionally tested and inspected prior to listing, reducing incoming QC burden for the buyer.
Complete System Bill of Materials
The CSF-25-160 component set includes:
- Flex Spline (FS) — the compliant cup-shaped gear element
- Wave Generator (WG) — elliptical cam with thin-section ball bearing
Note: Circular Spline (CS) is not included in the CSF component set. Customers integrating into a new housing must supply or machine the circular spline bore. For a complete unit including circular spline, consider the CSG or SHF series.
Recommended complementary components:
- Harmonic Drive Circular Spline (sold separately)
- Harmonic Grease SK-1A (lubrication)
- Cross-roller output bearing (e.g., IKO CRBS series, size 25)
- Servo motor with ≥3,500 rpm rated speed (Panasonic MINAS, Mitsubishi HG, Yaskawa Σ-7)
Compliance & Industry Standards
- RoHS 2 Compliant (Directive 2011/65/EU)
- CE Marking applicable for machinery directive integration
- ISO 9283 — Manipulating Industrial Robots: Performance Criteria (applicable end-use)
- Harmonic Drive AG / Harmonic Drive LLC OEM design standard
Quality Assurance & Sourcing
At Konmask.com, every surplus and refurbished automation component undergoes a structured inspection protocol before listing:
- Visual inspection for flex spline fatigue cracks, wave generator bearing wear, and housing damage
- Functional rotation test under no-load and partial-load conditions
- Backlash measurement verification
- Cleaning and re-greasing where applicable
Units marked TESTED have passed all inspection steps. Original OEM documentation and part markings are preserved.
How to Source This Part
This is a surplus / tested used unit available for immediate shipment. Stock is limited to quantity on hand.
- Lead Time: Ships within 1–3 business days of payment confirmation
- Packaging: Anti-static foam-lined box with moisture barrier
- Export: Available for international shipment; HS Code 8483.40 (gearboxes and speed changers)
- Payment: T/T, PayPal, credit card accepted
- MOQ: 1 piece
For volume pricing, system integration consulting, or alternative ratio availability (CSF-25-50, CSF-25-80, CSF-25-100, CSF-25-120), contact our engineering sales team.
Application-Specific FAQ
Q: Can this unit be used as a direct drop-in replacement for a FANUC robot joint?
A: The CSF-25-160 is used in various FANUC M-series and LR Mate joint axes. Confirm the exact joint axis drawing and flange interface before installation. We recommend cross-referencing the FANUC spare parts BOM.
Q: Is the flex spline reusable after removal from a robot?
A: Yes, provided there are no fatigue cracks at the cup rim. Our inspection process specifically checks for this. Flex splines should be re-greased upon reinstallation.
Q: What servo motor shaft diameter is compatible with the CSF-25-160 wave generator?
A: The standard WG bore for size 25 is typically ∅14 mm or ∅16 mm with keyway. Confirm with the Harmonic Drive CSF-25 dimensional drawing (available on request).
Q: Can this be used in a vertical load orientation?
A: Yes. The CSF series supports all mounting orientations. Ensure grease retention is adequate for vertical shaft-down configurations; a grease seal or labyrinth may be required in the housing design.
Q: Do you offer warranty on tested used units?
A: We offer a 30-day functional warranty covering defects identified during our inspection process. Units are sold as-is beyond this period. Contact support for details.
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