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CSKA/CSKW Precision Keyway Universal Joint Coupling – FA Automation Standard, 42CrMo, Single & Double Joint
Model Number
Check below, custom
| Model | Weight (g) |
|---|---|
| Single UNKA10 OD20 L42 ID10‑10 | 100 |
| Single UNKA12 OD23 L52 ID12‑12 | 100 |
| Single UNKA14 OD25 L59 ID14‑14 | 100 |
| Single UNKA16 OD32 L74 ID16‑16 | 100 |
| Single UNKA20 OD36 L87 ID20‑20 | 100 |
| Double UNKW10 OD20 L67.5 ID10‑10 | 100 |
| Double UNKW12 OD23 L83 ID12‑12 | 100 |
| Double UNKW14 OD25 L94.5 ID14‑14 | 100 |
| Double UNKW16 OD32 L117.5 ID16‑16 | 100 |
| Double UNKW20 OD36 L139 ID20‑20 | 100 |
Key:
OD = Outer Diameter
L = Length
ID = Inner Diameter (both ends, e.g., 10‑10 means both bores are 10 mm)
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Product Description
CSKA/CSKW Precision Keyway Universal Joint Coupling – FA Automation Standard, 42CrMo, Single & Double Joint
Factory direct | FA factory automation standard | 42CrMo alloy steel | Single (CSKA) or double (CSKW) joint | Keyway fastening | 45° angle per joint | H7 bore | Low backlash | 304 stainless steel option | Black oxide, nickel, zinc, polished finishes | OEM/ODM/OBM
The Apexcoupling CSKA/CSKW series is a precision keyway universal joint coupling manufactured to FA factory automation standards. Available in single joint (CSKA) and double joint (CSKW) configurations, these couplings are designed for reliable power transmission in factory automation, packaging machinery, woodworking equipment, multi-spindle drills, and general industrial applications. Constructed from 42CrMo alloy steel with optional 304 stainless steel, the CSKA/CSKW series delivers high strength, excellent wear resistance, and long service life. The built-in bearings and fixed pins allow for smooth operation up to 30° in continuous use, with a 45° limit angle per joint. Featuring keyway fastening, H7 precision bore, and low backlash for precise positioning, this series is the ideal choice for demanding automation environments and is directly interchangeable with Misumi UNCA/UNCW couplings.
✅ FA factory automation standard – large stock, rapid response, high efficiency. Keyway fastening – secure positive drive. 42CrMo alloy steel – high strength, quenched & tempered. 45° limit angle per joint – large angular compensation. Direct Misumi UNCA/UNCW replacement.
Key Technical Specifications
| Parameter | CSKA (Single Joint) | CSKW (Double Joint) |
|---|---|---|
| Standard | FA factory automation standard | FA factory automation standard |
| Structure | Single universal joint | Double universal joint |
| Body Material | 42CrMo alloy steel (standard) / 304 stainless steel (optional) | 42CrMo alloy steel (standard) / 304 stainless steel (optional) |
| Fastening Type | Keyway (键槽型) | Keyway (键槽型) |
| Bore Diameter (d) | 10, 12, 14, 16, 20 mm | 10, 12, 14, 16, 20 mm |
| Outer Diameter (D) | 20, 23, 25, 32, 36 mm | 20, 23, 25, 32, 36 mm |
| Length (L) | 42, 52, 59, 74, 87 mm | 67.5, 83, 94.5, 117.5, 139 mm |
| Allowable Torque | Up to 20.1 N·m (d=10) | Up to 20.1 N·m (d=10) |
| Allowable Operating Angle | ≤30° (continuous) / 45° (limit) | ≤30° (continuous) / 45° (limit per joint) |
| Max Speed (Pin/Block) | 1000 RPM | 1000 RPM |
| Max Speed (Needle Bearing) | 4000 RPM | 4000 RPM |
| Bore Tolerance | H7 | H7 |
| Bore Options | Keyway, hexagon hole (custom) | Keyway, hexagon hole (custom) |
| Surface Treatment | Black oxide, polished, nickel plated, zinc plated | Black oxide, polished, nickel plated, zinc plated |
| Material Options | 42CrMo alloy steel, 304 stainless steel, 316 stainless steel | 42CrMo alloy steel, 304 stainless steel, 316 stainless steel |
| Interchangeable With | Misumi UNCA | Misumi UNCW |
| Customized support | OEM, ODM, OBM | OEM, ODM, OBM |
| Applicable Industries | Packaging machinery, woodworking, multi-spindle drills, FA automation, general machinery | Packaging machinery, woodworking, multi-spindle drills, FA automation, general machinery |
| Warranty | 1 Year | 1 Year |
| Place of Origin | Guangdong, China | Guangdong, China |
🔧 Custom bores, keyways, hexagon holes, materials (304/316 stainless steel), and special finishes available. Large semi-finished stock – fast delivery. Contact us with your specifications.
CSKA/CSKW Series – Model Range & Specifications (Keyway Type)
| Model | Type | d (mm) | D (mm) | L (mm) | L1 (mm) | C (mm) | E (mm) | b (mm) | t (mm) | M | Weight (g) – Single | Weight (g) – Double |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CSKA10 / CSKW10 | Single / Double | 10 | 20 | 42 / 67.5 | 25.5 | 21 | 12 | 6 | 3 | 1.4 | M5 | 55 / 95 |
| CSKA12 / CSKW12 | Single / Double | 12 | 23 | 52 / 83 | 31 | 26 | 15 | 7.5 | 4 | 1.8 | M5 | 110 / 180 |
| CSKA14 / CSKW14 | Single / Double | 14 | 25 | 59 / 94.5 | 35.5 | 29.5 | 17 | 8.5 | 5 | 2.3 | M6 | 155 / 250 |
| CSKA16 / CSKW16 | Single / Double | 16 | 32 | 74 / 117.5 | 43.5 | 37 | 22 | 11 | 5 | 2.3 | M6 | 260 / 410 |
| CSKA20 / CSKW20 | Single / Double | 20 | 36 | 87 / 139 | 52 | 43.5 | 25 | 12.5 | 6 | 2.8 | M6 | 465 / 690 |
📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.
CSKA (Single) vs CSKW (Double) – Which One Do You Need?
| Feature | CSKA (Single Joint) | CSKW (Double Joint) |
|---|---|---|
| Angular misalignment | ✅ Up to 45° | ✅ Up to 45° per joint |
| Parallel offset | ❌ No | ✅ Yes |
| Total articulation | Up to 45° | Up to 90° |
| Length | Shorter | Longer |
| Weight | Lighter | Heavier |
| Best for | Shafts intersecting at an angle on the same plane | Shafts both angled and offset |
Rule of thumb for FA automation:
Use CSKA (single joint) for straight-line automation with slight angular misalignment.
Use CSKW (double joint) for applications where shafts are both angled and offset – common in conveyors, packaging machinery, and multi-spindle drills.
💡 Double joint configurations provide smoother power transmission and reduced vibration when both angular and parallel misalignment are present.
CSKA/CSKW vs UNKA/UNKW – Understanding the Difference
| Feature | CSKA / CSKW (This Series) | UNKA / UNKW |
|---|---|---|
| Fastening Type | Keyway (键槽型) – secure positive drive | Pin type (固定销型) – set screw/pin fastening |
| Best For | High torque, positive drive applications | Standard FA automation, quick installation |
| Interchangeability | Compatible with Misumi UNCA/UNCW | Compatible with Misumi UNCA/UNCW |
✅ CSKA/CSKW features keyway fastening – ideal for applications requiring secure, high-torque connections. UNKA/UNKW features pin/set screw fastening – ideal for standard FA automation applications. Both series are interchangeable with Misumi UNCA/UNCW.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| FA Automation Standard | Large conventional stock – rapid delivery. High transmission efficiency. Rapid response in both clockwise and counterclockwise rotation |
| 42CrMo Alloy Steel | High strength, excellent toughness, and fatigue resistance – quenched and tempered for durability |
| 304 Stainless Steel Option | Corrosion-resistant – ideal for food & beverage, marine, and outdoor applications |
| Keyway Fastening | Secure positive drive – transmits high torque without slipping |
| Built-in Bearings & Fixed Pins | Smooth operation up to 30° – reduces wear and extends service life |
| 45° Limit Angle Per Joint | Large angular compensation – accommodates significant misalignment |
| Double Joint (CSKW) Capability | Up to 90° total articulation – handles both angular and parallel offset |
| H7 Precision Bore | High concentricity, accurate shaft fit – reduces vibration |
| Low Backlash | Precision fit – smooth, quiet operation, accurate positioning |
| Direct Misumi UNCA/UNCW Replacement | Interchangeable with Misumi series – no design changes required |
| Multiple Surface Finishes | Black oxide, polished, nickel plated, zinc plated – choose based on your environment |
| Large Semi-Finished Stock | Fast delivery for standard and custom orders |
Material Options – 42CrMo vs 304 Stainless Steel
| Feature | 42CrMo Alloy Steel | 304 Stainless Steel |
|---|---|---|
| Strength | Very high (quenched & tempered) – HB240-280 | Moderate |
| Toughness & fatigue resistance | Excellent | Good |
| Wear resistance | High | Medium |
| Corrosion resistance | Moderate (needs coating) | Excellent |
| Cost | Lower | Higher |
| Best for | Heavy-duty industrial, high torque, shock loads | Food processing, chemical, marine, outdoor |
Our recommendation:
Choose 42CrMo with black oxide for most industrial and factory automation applications.
Choose 304 stainless steel for food & beverage, chemical, marine, or outdoor applications where corrosion resistance is critical.
Surface Finish Options
| Finish | Appearance | Corrosion Protection | Best For |
|---|---|---|---|
| Black Oxide (Standard) | Black, matte | Moderate | General industrial, FA automation |
| Polished | Bright, reflective | Low (cosmetic) | Aesthetic applications |
| Nickel Plated | Silver, shiny | Good | Moderate corrosion environments |
| Zinc Plated | Silver, slightly blue | Good | Outdoor, moisture-prone applications |
Applications
Packaging Machinery – Conveyors, wrapping machines, carton sealers
Woodworking Machinery – Multi-spindle drills, routers, saws
Multi-Spindle Drills – Precision drilling operations
FA Automation – Pick-and-place systems, indexing tables
CNC Machines – Feed drives, positioning systems
Printing Equipment – Register control, high-speed operation
Textile Machinery – Spinning, weaving equipment
Food & Beverage Processing – With 304SS option for hygienic applications
General Industrial Machinery – Pumps, mixers, conveyors
Why Choose Apex Coupling for CSKA/CSKW Universal Joints?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| FA Automation Standard | Large stock, rapid response, high efficiency |
| Premium 42CrMo Steel | High strength, toughness, and fatigue resistance |
| 304 Stainless Steel Option | Corrosion-resistant for demanding environments |
| Keyway Fastening | Secure positive drive – ideal for high-torque applications |
| Single or Double Joint | One product family covers all angular and offset needs |
| Multiple Finishes | Black oxide, polished, nickel, zinc |
| Built-in Bearings & Fixed Pins | Smooth operation up to 30° – extends service life |
| Direct Misumi UNCA/UNCW Replacement | Interchangeable – no design changes required |
| Large Semi-Finished Stock | Fast delivery for standard sizes |
| OEM Customization | Custom bores, materials, finishes, and special designs available |
FAQ
Q: What is the difference between CSKA and CSKW?
A: CSKA is a single universal joint – for angular misalignment only. CSKW is a double universal joint – allows both angular misalignment and parallel offset, providing smoother motion.
Q: What is the difference between CSKA and UNKA?
A: Both are single universal joints. CSKA features keyway fastening (键槽型) – ideal for high-torque, positive drive applications. UNKA features pin/set screw fastening (固定销型) – ideal for standard FA automation. Both are interchangeable with Misumi UNCA.
Q: What is the maximum operating angle?
A: With built-in bearings and fixed pins, the coupling is designed for continuous operation up to 30°. The absolute limit per joint is 45°.
Q: What materials are available?
A: Standard is 42CrMo alloy steel. We also offer 304 and 316 stainless steel.
Q: What surface finishes are available?
A: Standard is black oxide. We also offer polished, nickel plated, and zinc plated finishes.
Q: Is this coupling interchangeable with Misumi UNCA/UNCW?
A: Yes. The CSKA/CSKW series is a direct replacement for Misumi UNCA/UNCW – no design changes required.
Q: What are the common applications?
A: Packaging machinery, woodworking equipment, multi-spindle drills, FA automation, CNC machines, and general industrial machinery.
Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, materials, finishes, and special designs available.
Request a Quote
Send us your configuration (single or double), bore size, material preference, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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