Description
Plain Bore Yoke Type C (Keyway & Threaded Hole) — Dual-Lock Self-Contained PTO Yoke
The Plain Bore Yoke Type C-Keyway & Threaded Hole was designed for applications where Type B keyway yokes require additional axial retention but external circlips or end plates are impractical. A threaded hole in the yoke hub accepts a standard socket-head set screw that bears against the shaft surface (or key), locking the yoke axially in position. This creates a completely self-contained retention system: key for torque, set screw for position — no external hardware visible or accessible to catch on guards or housings. Type C is the preferred specification for enclosed gearbox inputs and compact machinery where clean, snag-free installation matters.
🔧 Technical Specifications
| Series | A(mm) | B(mm) | C(mm) | D(mm) | F(mm) | G(mm) | H |
|---|---|---|---|---|---|---|---|
| 1.05C20-C30 | 22 | 54 | 77 | 20 | 12.8-18.3 | 20-30 | M6-M8 |
| 2.05C20-C30 | 23.8 | 61.3 | 82 | 20 | 12.8-18.3 | 20-30 | M6-M8 |
| 3.05C22-C35 | 27 | 70 | 90 | 20 | 13.8-20.8 | 22-35 | M6-M10 |
| 4.05C22-C35 | 27 | 74.6 | 90 | 20 | 13.8-20.8 | 22-35 | M6-M10 |
| 5.05C30-C40 | 30.2 | 80 | 98 | 20 | 18.3-23.3 | 30-40 | M8-M12 |
| 6.05C30-C42 | 30.2 | 92 | 104 | 20 | 18.3-24.3 | 30-42 | M8-M12 |
| 7.05C35-C45 | 30.2 | 106.5 | 117 | 25 | 20.8-26.3 | 35-45 | M10-M14 |
| 8.05C35-C45 | 35 | 106.5 | 121 | 25 | 20.8-26.3 | 35-45 | M10-M14 |
⭐ Key Features & Benefits
🔒 Self-Contained Dual Lock
Key + set screw = complete retention without external circlips, collars, or end plates. Clean, compact installation.
🔧 Anti-Creep Set Screw
Socket-head cap screw threads into a tapped hole and bears against the shaft, preventing gradual axial migration under vibration.
🔑 Precision Keyway Drive
DIN 6885 keyway provides the same positive torque transfer as standalone Type B, with added axial security.
⚙ Metric Thread Standards
Threaded holes use standard M6 through M14 metric threads, accepting readily available set screws.
📏 Enclosed-Space Friendly
No protruding hardware — ideal for yokes installed inside gearbox housings or close to guards and covers.
💪 Vibration-Rated Retention
Dual-lock mechanism maintains grip under continuous vibration where single-retention methods gradually loosen.
🔄 Compatibility Information
Fits keyed cylindrical shafts in 20-45 mm range. Compatible with enclosed gearbox inputs, speed reducers, and precision equipment. Works with shaft designs from all major gearbox manufacturers.
📚 Selection Guide
Choose Type C when: You need keyway-quality torque transfer plus axial retention, and external retention devices (circlips, collars) are impractical or unwanted.
Set Screw Selection: Use a socket-head cap screw with a cup point for maximum grip. Apply thread-locking compound (medium strength) to prevent the set screw from loosening.
🌾 Typical Application Scenarios
Input shafts inside gearbox housings where external retention is inaccessible
Equipment with close-fitting guards that cannot accommodate external collars
Pump, crusher, and mixer drives subject to continuous vibration
Applications requiring no protruding hardware for safety or aesthetic reasons
🛠 Installation & Usage Guide
- Seat key in shaft: Install standard parallel key.
- Slide yoke onto shaft: Engage key and push to position.
- Thread set screw: Apply medium-strength thread lock and tighten socket-head set screw firmly against shaft.
- Verify: No rotational play (key) and no axial movement (set screw).
- Check periodically: Re-torque set screw every 100 hours in vibration-heavy applications.
- Complete assembly: Install cross kit, shaft, and safety guard.
❓ Frequently Asked Questions
🌟 Customer Reviews
Neil S. — 🇦🇺 Australia
“Perfect for our enclosed gearbox applications. The set screw holds position firmly and the keyway drives without slippage.”
Volker H. — 🇩🇪 Germany
“Clean, professional design. The dual-lock system works exactly as expected in our vibrating pump drives.”
Ricardo L. — 🇧🇷 Brazil
“Good quality. The threaded hole is cleanly tapped. We use Loctite on the set screw and it stays put.”
Dave W. — 🇺🇸 United States
“Type C solved our axial creep problem on a mixer drive shaft. The set screw provides the extra retention we needed.”
Emma R. — 🇫🇷 France
“We specify Type C for all enclosed installations. No external clips to snag on guards. Excellent design and quality.”
⚖ Our Product vs. Inferior Alternatives
| Feature | Ever-power | Low-Cost Alternatives |
|---|---|---|
| Axial Retention | Set screw — compact, self-contained | External circlip — requires groove |
| Installation Profile | Flush, no protruding hardware | Circlip or collar protrudes |
| Vibration Resistance | Thread lock + set screw holds firm | Circlips can walk out |
| Accessibility | Allen key access from outside | Need circlip pliers inside housing |
| Quality | Precision tapped, DIN keyway | Variable thread quality |
| Certification | ISO 9001:2015 | Often none |
🔗 Related Products & Accessories
Socket Set Screws
Cup, flat, and cone point set screws in M6-M14
Thread Locking Compound
Medium-strength retaining compounds
Type D Yokes
Heavy-duty clamp bolt alternative
Cross-kit
Universal joint kits
Explore our full PTO shaft components catalog for matching parts.
✅ Certifications & Quality Standards
- ISO 9001:2015 Certified
- DIN 6885 Keyway + Thread Compliance
- Go/No-Go Thread Gauging
- Bore H7 Verification
- Perpendicularity of Thread to Bore Axis
🏭 Why Choose Ever-power?
Type C yokes showcase our combined boring, broaching, and threading capabilities in a single component. Our CNC machining centers perform all three operations in a single setup, ensuring perfect alignment between bore, keyway, and threaded hole. This integrated process is the result of 15+ years of fixture design refinement and produces the most dimensionally consistent dual-lock yokes on the market.
Self-Contained Retention for Enclosed Installations
Type C keyway + set screw yokes keep your installation clean and secure. Get a quote for your enclosed gearbox application.
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