Description
Star Yoke for PTO Shaft — Heavy-Duty Star-Profile Connection for High-Torque Applications
The Star Yoke for PTO Shaft is engineered for the most demanding power take-off applications where superior torque capacity and load distribution are critical. The star-shaped multi-lobed bore profile interlocks with matching star tubes to create a high-contact-area joint that resists deformation under extreme torsional stress. This design is favored in heavy-duty Series 6 through Series 50 PTO shafts on high-horsepower tractors and industrial equipment. Each star yoke is drop-forged from premium alloy steel, CNC-machined, and induction-hardened at all critical surfaces.
🔧 Technical Specifications
| Series | A(mm) | B(mm) | C(mm) | D(mm) |
|---|---|---|---|---|
| 6.06ST | 30.2 | 92 | 104 | 56.8 |
| 6.07ST | 30.2 | 92 | 104 | 47.4 |
| 7.06ST | 30.2 | 106.5 | 117 | 56.8 |
| 7.07ST | 30.2 | 106.5 | 117 | 47.4 |
| 8.06ST | 35 | 106.5 | 121 | 56.8 |
| 8.07ST | 35 | 106.5 | 121 | 47.4 |
| 7N.06ST | 35 | 94 | 106 | 56.8 |
| 7N.07ST | 35 | 94 | 106 | 47.4 |
| 32.06ST | 32 | 76 | 98 | 56.8 |
| 32.07ST | 32 | 76 | 98 | 47.4 |
| 36.06ST | 36 | 89 | 106 | 56.8 |
| 36.07ST | 36 | 89 | 106 | 47.4 |
| 9.06ST | 41 | 108 | 130 | 67.5 |
| 9.07ST | 41 | 108 | 130 | 56.8 |
| 10.06ST | 41 | 118 | 125 | 67.5 |
| 10.07ST | 41 | 118 | 125 | 56.8 |
| 42.06ST | 42 | 104.5 | 130 | 67.5 |
| 42.07ST | 42 | 104.5 | 130 | 56.8 |
| 50.06ST | 50 | 118 | 133 | 67.5 |
| 50.07ST | 50 | 118 | 133 | 56.8 |
⭐ Key Features & Benefits
⭐ Star-Profile Multi-Lobe Bore
Multi-lobed geometry maximizes contact area, distributing torque over a larger surface and reducing stress concentrations.
💪 Extreme Torque Capacity
Designed for 80-300+ HP applications across Series 6-50.
⚙ Precision CNC Machining
Star bore profile CNC-milled to ±0.02 mm, eliminating backlash and vibration.
🔥 Through-Hardened Construction
Full heat treatment HRC 58-62 for exceptional wear and fatigue resistance.
📐 Extended Size Range
Available up to Series 50 (50 mm bore, 118 mm tube OD) — the largest PTO shaft systems.
🛡 Industrial-Grade Finish
Heavy-duty zinc phosphate or electrophoretic finish for maximum corrosion protection.
🔄 Compatibility Information
Compatible with star-profile PTO tubes from Series 6 through Series 50. Works with Walterscheid, Bondioli & Pavesi, Comer, AW Dynamik, Driveline Solutions. For high-HP tractors: John Deere, Case IH, New Holland, Fendt, CLAAS, Massey Ferguson, Valtra. Integrates with heavy-duty cross kits, wide-angle joints, and overrunning clutches.
📚 Selection Guide
Step 1 — Confirm Star Profile: Star tubes have a multi-lobed cross-section (typically 6 lobes). Verify yours is star, not triangular or lemon.
Step 2 — Measure Tube OD (B): Star tubes range from 76 mm (Series 32) to 118 mm (Series 50).
Step 3 — Select ST Variant: .06ST for wider/heavy-duty or .07ST for standard-width configurations.
🌾 Typical Application Scenarios
Large balers, self-loading wagons, forage harvesters, silage choppers
Wood chippers, stump grinders, industrial pumps, generators, compressors
Heavy rotary cultivators, deep plows, subsoilers, large power harrows
High-capacity slurry tankers, manure injectors, irrigation systems
🛠 Installation & Usage Guide
- Match star profiles: Confirm yoke and tube have same lobe count and dimensions.
- Clean and inspect: Thoroughly clean surfaces. Inspect for cracks, chips, or wear.
- Align and slide: Carefully align the star profile. Use soft mallet if resistance encountered.
- Secure the yoke: Install retaining hardware (snap rings, bolts, or collar).
- Install heavy-duty cross kit: Use the corresponding heavy-duty cross kit rated for your application.
- Lubricate thoroughly: Star applications involve higher loads — ensure generous greasing.
❓ Frequently Asked Questions
🌟 Customer Reviews
Bruce K. — 🇦🇺 Australia
“These star yokes handle our 250 HP rotary cutter without issue. Forging quality is superior.”
Frank W. — 🇩🇪 Germany
“We use these in industrial PTO shaft assemblies for wood processing. Zero failures over 18 months.”
Luis G. — 🇲🇽 Mexico
“Good heavy-duty yokes at competitive price. Series 9 and 10 fit perfectly on irrigation pump shafts.”
John D. — 🇺🇸 United States
“Outstanding quality for the price. They outsell name-brand equivalents in our dealership.”
Yves B. — 🇫🇷 France
“Star profile machining is very precise. Cross kits install with perfect alignment.”
⚖ Our Product vs. Inferior Alternatives
| Feature | Мәңгілік күш | Low-Cost Alternatives |
|---|---|---|
| Torque Capacity | Rated for 100-300+ HP | Often limited to 80 HP |
| Lobe Geometry | Precision multi-lobe CNC machined | Rough-formed lobes, poor contact |
| Material | Premium forged alloy steel | Lower grade cast or stamped steel |
| Bearing Bore | Precision ground with snap-ring grooves | Drilled only, no retention |
| Fatigue Resistance | Through-hardened, tested to 1M cycles | Untested, prone to cracking |
| Size Range | Up to Series 50 (50 mm bore) | Typically limited to Series 8 |
🔗 Related Products & Accessories
Star-Profile PTO Tubes
Inner and outer star tubes in matching series
Heavy-Duty Cross Kits
High-torque universal joint kits for Series 6-50
Wide-Angle Joints
Constant-velocity joints for steep operating angles
Overrunning Clutches
Freewheel protection for driven implements
Explore our full PTO shaft components catalog for matching parts.
✅ Certifications & Quality Standards
- ISO 9001:2015 Quality Management
- Full Material Traceability (Heat Number)
- Destructive Testing Reports (Tensile, Impact)
- Non-Destructive Testing (MPI available)
- CE Compliance Documentation
🏭 Why Choose Ever-power?
We specialize in heavy-duty PTO shaft components, with dedicated production lines for star-profile yokes and tubes. Our 25+ years of manufacturing experience and advanced forging and CNC equipment enable us to produce star yokes with tight tolerances demanded by OEM partners worldwide. We maintain strategic inventory of all popular series for rapid fulfillment.
Need Heavy-Duty Star Yokes for Your Project?
Contact our engineering team for specifications, pricing, and custom star yoke solutions.
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