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WSP Telescopic Universal Joint Coupling – Retractable Spline, 42CrMo, 25-6300 N·m
Model Number
Check below, custom
WSP Series – Telescopic Universal Joints
| Model | Inner Diameter (mm) | Outer Diameter (mm) | Retracted Length (mm) | Extended Length (mm) |
|---|---|---|---|---|
| WSP‑03GA | 12 | 20 | 140 | 170 |
| WSP‑04GA | 14 | 25 | 160 | 190 |
| WSP‑05GA | 14 | 28 | 170 | 220 |
| WSP‑1GA | 16 | 32 | 190 | 220 |
| WSP‑2GA | 18 | 36 | 230 | 280 |
| WSP‑3GA | 20 | 42 | 250 | 300 |
| WSP‑4GA | 22 | 45 | 250 | 280 |
| WSP‑5GA | 25 | 50 | 295 | 345 |
| WSP‑6GA | 30 | 58 | 330 | 380 |
| WSP‑7GA | 35 | 70 | 350 | 400 |
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Product Description
WSP Telescopic Universal Joint Coupling – Retractable Spline, 42CrMo, 25-6300 N·m, 45° Angle
Factory Direct | 42CrMo Alloy Steel | Retractable Telescopic Spline Design | 45° Angle Per Joint | H7 Precision Bore | 25-6300 N·m Torque | 1000-4000 RPM | Keyway/Hex/Square Hole Options | JB/T5901-1991 | OEM Customizable
The Apexcoupling WSP series is a high-precision telescopic universal joint coupling engineered for applications requiring both angular misalignment compensation and axial length adjustment.
Featuring a retractable spline shaft design that allows the overall length to be easily adjusted, this coupling solves both distance and angular offset problems between the drive end and the driven load. Manufactured from 42CrMo alloy steel with optional stainless steel, the WSP series delivers high strength, excellent wear resistance, and long service life. Available in single or double joint configurations with sliding bearing (up to 1000 RPM) or needle roller bearing (up to 4000 RPM), this coupling offers flexibility for a wide range of industrial applications. With 45° maximum angular displacement per section and H7 finished bore tolerance, the WSP series is the ideal solution for packaging machinery, woodworking equipment, multi-spindle drills, printing presses, metallurgical machinery, and general automation.
✅ Retractable telescopic spline design – compensates axial displacement without disassembly. 45° angle per joint – accommodates significant misalignment. 42CrMo alloy steel – high strength and durability. H7 precision bore – accurate shaft fit. Sliding bearing (1000 RPM) or needle bearing (4000 RPM). JB/T5901-1991 standard. OEM custom lengths and bores available.
Key Technical Specifications (JB/T5901-1991)
| Parameter | Value |
|---|---|
| Standard | JB/T5901-1991 |
| Material | 42CrMo alloy steel (standard); 304/316 stainless steel optional |
| Bearing Options | Sliding bearing (pin/block) / Needle roller bearing |
| Max Speed (Sliding Bearing) | 1000 RPM |
| Max Speed (Needle Bearing) | 4000 RPM |
| Maximum Angle Per Joint | 45° (limit) / 30° (recommended for continuous use) |
| Bore Tolerance | H7 |
| Bore Options | Keyway (add K), Hexagon hole (add F), Square hole (add S), Spline hole (add H) |
| Torque Range | 25 – 6300 N·m |
| Outer Diameter Range | 20 – 95 mm |
| Bore Diameter Range | 10 – 50 mm (H7) |
| Hardness (Center Slider) | 45-50 HRC (quenched) |
| Hardness (Pins) | 50-55 HRC (carburized & quenched) |
| Surface Treatment | Black oxide, polished, chrome plated, nickel plated, sandblasted |
| Customization | OEM – custom lengths, bores, keyways, and materials |
| Place of Origin | Guangdong, China |
WSP Series – Model Range & Specifications
| Model | Bore dH7 (mm) | Outer Diameter D (mm) | L2 (mm) | C (mm) | Lmin/Lmax (mm) | B (mm) | b JS9 (mm) | t1 (mm) |
|---|---|---|---|---|---|---|---|---|
| WSP-03GA | 12 | 23 | 52 | 14 | 160/190 | 30 | 4 | 13.8 |
| WSP-04GA | 14 | 25 | 59 | 16 | 170/200 | 40 | 5 | 16.3 |
| WSP-05GA | 14 | 28 | 60 | 16 | 170/220 | 40 | 5 | 16.3 |
| WSP-1GA | 16 | 32 | 82 | 23 | 190/220 | 40 | 5 | 18.3 |
| WSP-2GA | 18 | 36 | 87 | 25 | 230/280 | 40 | 6 | 20.8 |
| WSP-3GA | 20 | 42 | 94 | 25 | 250/300 | 45 | 6 | 22.8 |
| WSP-4GA | 22 | 45 | 95 | 22 | 250/280 | 50 | 8 | 24.8 |
| WSP-5GA | 25 | 50 | 108 | 26 | 295/345 | 50 | 8 | 28.3 |
| WSP-6GA | 30 | 58 | 122 | 29 | 330/380 | 60 | 8 | 33.3 |
| WSP-7GA | 35 | 70 | 140 | 35 | 350/400 | 70 | 10 | 38.3 |
📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.
Bearing Selection – Sliding vs Needle Roller
The WSP series offers two bearing options to match your speed and load requirements:
| Feature | Sliding Bearing (Pin/Block) | Needle Roller Bearing |
|---|---|---|
| Max Speed | 1000 RPM | 4000 RPM |
| Torque Capacity | Higher for size | Lower (approx. 50% of sliding) |
| Friction | Higher – metal-to-metal contact | Lower – rolling elements |
| Maintenance | Requires periodic lubrication | Sealed, low maintenance |
| Best for | Low-speed, high-torque, shock loads | High-speed, smooth rotation, precision |
⚠️ Note: It is recommended to use the coupling at ≤50% of the maximum rated speed for optimal service life.
Product Structure
Two Yokes (Forks) – Precision-machined from 42CrMo alloy steel with H7 bores.
Cross Shaft (Cross Axis) – The central component that transmits torque.
Telescopic Spline Shaft – Allows axial length adjustment (travel S).
Center Slider – Quenched 45-50 HRC for wear resistance.
Pins – Carburized 45-50 HRC for durability.
💡 How it works: The WSP telescopic universal joint consists of two yokes connected by a cross shaft, with a telescopic spline shaft between them that allows axial length adjustment. The telescopic design makes repositioning simpler and faster than double universal joints. In cases of axial misalignment, the length can be easily adjusted without disassembling the shaft assembly, significantly reducing maintenance downtime and improving operational efficiency. The center slider and pins are hardened for wear resistance, ensuring smooth, jam-free rotation with low noise. The angle between the two shafts is allowed to change within a limited range (up to 45° per joint) according to working needs.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Telescopic Spline Design | Allows axial length adjustment without disassembly – compensates for shaft spacing variations in real-time |
| 45° Angle Per Joint | Large angular compensation – accommodates significant misalignment |
| 42CrMo Alloy Steel | High strength, excellent toughness, and fatigue resistance – withstands heavy loads |
| Hardened Components | Center slider 45-50 HRC, pins 45-50 HRC – superior wear resistance and long service life |
| Two Bearing Options | Sliding (1000 RPM) or needle (4000 RPM) – match your speed requirement |
| H7 Precision Bore | High concentricity, accurate shaft fit – reduces vibration |
| Multiple Bore Options | Keyway, hexagon, square, spline – choose your connection type |
| Multiple Material Options | 42CrMo, 45#, 35CrMo, 304/316 stainless steel – corrosion resistance |
| Multiple Surface Finishes | Black oxide, polished, chrome, nickel, sandblasted |
| JB/T5901-1991 Standard | Manufactured to established Chinese national standard |
| Low Noise & Long Life | Precision fit joints – smooth rotation, low noise, long service life |
| OEM Customization | Custom lengths, bores, keyways, and materials |
| Anti-Dust Boot Option | Optional protective boot available – keeps joints clean and extends service life |
Applications
Packaging Machinery – Conveyors, wrapping machines, carton sealers
Woodworking Machinery – Multi-spindle drills, routers, saws
Multi-Spindle Drills – Precision drilling operations
Metallurgical Equipment – Rolling mills, continuous casting lines
Printing Machinery – Register control, high-speed operation
Paper Machinery – Paper production and finishing
Test Benches – Precision power transmission testing
Conveyors – Material handling systems
Pump Equipment – Water and industrial pumps
Food & Beverage Machinery – Hygienic, reliable drives (with stainless steel option)
General Automation – Pick-and-place systems, indexing tables
Why Choose Apex Coupling for WSP Telescopic Universal Joints?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| JB/T5901-1991 Standard | Manufactured to established Chinese national standard – quality assured |
| Premium 42CrMo Steel | High strength, toughness, and fatigue resistance |
| Telescopic Design | Compensates axial displacement – flexible shaft spacing |
| Two Bearing Options | Sliding (1000 RPM) or needle (4000 RPM) |
| 45° Angle Capacity | Large angular compensation – accommodates significant misalignment |
| H7 Precision Bore | High accuracy, low backlash, reliable operation |
| Multiple Bore Options | Keyway, hexagon, square, spline – fully customizable |
| Multiple Finishes | Black oxide, polished, chrome, nickel, sandblasted |
| 304/316 Stainless Steel Option | Corrosion-resistant for demanding environments |
| OEM Customization | Custom lengths, bores, keyways, and materials |
| Large Semi-Finished Stock | Fast delivery for standard and custom orders |
Customization Options
| Customization | Options |
|---|---|
| Total Length | Custom lengths available – specify your required Lmin/Lmax |
| Telescopic Stroke | Custom strokes available |
| Bore Type | Keyway (add K), Hexagon (add F), Square (add S), Spline (add H) |
| Bearing Type | Sliding (1000 RPM) or Needle roller (4000 RPM) |
| Material | 42CrMo, 45#, 35CrMo, 304/316 stainless steel |
| Surface Treatment | Black oxide, polished, chrome, nickel, sandblasted |
| Anti-Dust Boot | Optional protective boot available |
Model Designation – WSP Series
WSP-XXGA-d×D-Lmin/Lmax
| Position | Meaning | Example |
|---|---|---|
| WSP | Series code – Telescopic Universal Joint | WSP |
| XXGA | Model variant (e.g., 03GA, 1GA, 5GA) | 3GA |
| d×D | Bore diameter × Outer diameter | 20×42 |
| Lmin/Lmax | Minimum/Maximum installation length | 250/300 |
Keyway Option: Add “K” after the bore diameter.
Example: WSP-3GA-20K×42-250/300 – with keyway
Hexagon Option: Add “F” after the bore diameter.
Example: WSP-3GA-20F×42-250/300 – with hexagon hole
Square Option: Add “S” after the bore diameter.
Example: WSP-3GA-20S×42-250/300 – with square hole
FAQ
Q: What is a telescopic universal joint coupling?
A: A telescopic universal joint (also called a retractable or spline universal joint) combines a universal joint for angular misalignment with a spline connection for axial length adjustment. It allows for compensation of both angular and axial displacement.
Q: What is the advantage of the WSP telescopic design?
A: The WSP series features a retractable spline shaft that allows the coupling length to be adjusted – accommodating variable shaft spacing, thermal expansion, and simplifying installation/removal.
Q: What is the maximum operating angle?
A: Each joint can operate up to 45° limit angle. For continuous operation, we recommend ≤30°.
Q: What bearing options are available?
A: Sliding bearing (pin/block) – up to 1000 RPM, higher torque capacity. Needle roller bearing – up to 4000 RPM, lower friction, maintenance-free.
Q: What materials are available?
A: Standard is 42CrMo alloy steel. We also offer 45#, 35CrMo, 304 and 316 stainless steel.
Q: What is the bore tolerance?
A: Standard finished bore tolerance is H7 for precision shaft fit.
Q: What bore types are available?
A: We offer keyway, hexagon hole, square hole, and spline hole. Add K, F, S, or H after the bore diameter when ordering.
Q: What are the common applications?
A: Packaging machinery, woodworking equipment, multi-spindle drills, metallurgy, printing, conveyors, and general automation.
Q: What is the recommended operating speed?
A: It is recommended to use the coupling at ≤50% of the maximum rated speed for optimal service life.
Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom lengths, bores, keyways, materials, and finishes available.
Q: What is the hardness of the center slider and pins?
A: The center slider is quenched to 45-50 HRC. The pins are carburized and quenched to 50-55 HRC.
Q: Can I add a dust boot?
A: Yes. Optional anti-dust boots are available to protect the joint from contamination and extend service life.
Request a Quote
Send us your model (e.g., WSP-3GA), bore size, bore type (round/keyway/hex/square), length range, bearing type, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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