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UNCA/UNCW Universal Joint Coupling – Single & Double Joint, Pin & Snap Ring Type | 42CrMo Alloy Steel
Model Number
Check below, custom
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
UNCA/UNCW Universal Joint Coupling – Pin & Snap Ring Type | Single or Double Joint
Factory automation standard | 42CrMo alloy steel | H7 precision bore | Up to 40° angle per joint
The UNCA (single) and UNCW (double) series are precision universal joint couplings with pin and snap ring design. They are ideal for FA factory automation, offering high torque transmission, large angular compensation, and low maintenance.
✅ Also available as CSCA/CSCW universal joint series – same high quality, different naming.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | UNCA (single joint), UNCW (double joint) |
| Alternative models | CSCA / CSCW |
| Material | 42CrMo alloy steel (high strength & toughness) |
| Heat treatment | Yes – improves fatigue resistance & impact strength |
| Bore tolerance | H7 precision (high concentricity, accurate fit) |
| Max. working angle (single joint) | 40° (within normal use) |
| Limit angle per joint | Up to 45° |
| Backlash | Very low (precision fit, smooth rotation) |
| Noise level | Low |
| Standard finishes | Black oxide (standard) |
| Optional finishes | Nickel plated, zinc plated, polished (磨光) |
| Alternative material | 304 stainless steel (available on request) |
| Customization | Non‑standard bores, lengths, finishes accepted |
| Stock | High inventory for standard models |
| Origin | Guangdong, China |
🔧 Non‑standard sizes, special materials (304SS), and custom finishes are welcome – contact us with your drawing.
Product Selling Points
✅ 42CrMo Alloy Steel – Strength & Durability
High strength and toughness after heat treatment
Excellent fatigue resistance and multiple‑impact endurance
Wear‑resistant for long service life
✅ H7 Precision Bore
Bore tolerance controlled to H7 (high accuracy)
High concentricity – ensures smooth running, reduces vibration
Precise fit with shafts
✅ Large Angle Compensation
Single joint works up to 40° without performance loss
Reduces accidents caused by misalignment
Low inertia, high angular adjustability
✅ Low Backlash & Low Noise
Precision‑machined cross shaft and needle bearings
Tight fit, flexible rotation, quiet operation
Suitable for applications requiring smooth, precise motion
✅ FA Automation Standard – High Availability
Large stock of standard sizes (UNCA/UNCW, CSCA/CSCW)
Fast response for both clockwise and counter‑clockwise rotation
High transmission efficiency
✅ Multiple Surface Finishes & Materials
Standard: black oxide
Optional: nickel plated, zinc plated, polished (bright finish)
Material upgrade: 304 stainless steel for corrosion‑resistant environments
Product Structure & Features
Pin & snap ring design – easy assembly, secure locking
Single joint (UNCA) – compact, for short span with angular misalignment
Double joint (UNCW) – allows larger parallel offset, smoother motion
Cross shaft with needle bearings – reduces friction, extends life
Precision machined yokes – ensures consistent quality
Applications
FA factory automation (pick & place, conveyors, indexing tables)
Packaging machinery
Printing machinery
Textile equipment
Medical devices (low noise requirement)
Food processing machinery (304SS option)
Robotics & linkage mechanisms
General industrial drives where large angle or offset is needed
Why Choose Apex Coupling for Universal Joint Couplings?
| Advantage | Description |
|---|---|
| Factory direct | Competitive pricing for B2B buyers |
| Precision manufacturing | H7 bore, low backlash, high concentricity |
| Material quality | 42CrMo heat‑treated, optional 304 stainless steel |
| Large angle capacity | 40° per joint – reduces need for multiple joints |
| Customization | Bore, length, finish, material – all modifiable |
| Fast delivery | Stock for standard sizes; custom 7‑12 days |
| Technical support | Free selection advice and 2D/3D drawings |
FAQ
Q: What is the difference between UNCA and UNCW?
A: UNCA is a single joint (one cross shaft) – for angular misalignment up to 40°. UNCW is a double joint (two cross shafts with a center yoke) – allows angular plus parallel offset, smoother motion.
Q: What is the maximum working angle?
A: For single joint, 40° within normal use. The absolute limit per joint is 45°.
Q: Can I get a 304 stainless steel version?
A: Yes. We offer 304 stainless steel for corrosion‑resistant applications (food, medical, marine). Lead time may be slightly longer.
Q: What surface finishes are available?
A: Standard is black oxide. Also available: nickel plated, zinc plated, or polished (bright finish).
Q: Is there any backlash?
A: The UNCA/UNCW series has very low backlash due to precision‑machined cross shaft and needle bearings. For absolute zero‑backlash applications, we recommend our rigid couplings.
Q: Do you stock standard sizes?
A: Yes. UNCA, UNCW, CSCA, CSCW are standard FA automation series with high inventory.
Request a Quote
Send us your required bore size, length, working angle, and finish preference. We will reply within 24 hours with a quotation and dimension drawing.
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