WSP Retractable Small Cross Universal Joint Coupling – Telescopic Spline, 42CrMo, 45° Angle

Factory direct | 42CrMo alloy steel | Telescopic/retractable spline design | 45° angle per joint | H7 bore | Keyway/hex/square hole options | JB/T5901-1991 | OEM/ODM/OBM

The Apexcoupling WSP series is a retractable (telescopic) small cross universal joint coupling designed for applications requiring both angular misalignment compensation and axial length adjustment. Featuring a spline connection that allows length variation, this coupling is ideal for connecting shafts with greater axis spacing or variable distances. Manufactured from 42CrMo alloy steel with H7 precision bore, it delivers high strength, toughness, and fatigue resistance. Available with keyway, hexagon, or square hole options, the WSP series is the perfect solution for general machinery, food & beverage equipment, farms, home use, retail, and other industrial applications.

✅ Retractable/telescopic design allows for axial length adjustment while providing up to 45° angular misalignment compensation per joint.

Key Technical Specifications

🔧 Custom bores, keyways, hexagon/square holes, lengths, and special materials available. Contact us with your specifications.

Design Principles – Length & Stroke Calculation

For WSP telescopic universal joints, the installation length L and travel X are calculated as follows :

• Travel calculation: Xs = (Lmax – 2·L2 – B) / 2

• Minimum length: Lmin ≥ (Lmax + 2·L + B) / 2

• Maximum length: Lmax = Lmin + travel

Where:

• L = total length

• L2 = length of each joint

• B = spline engagement length

• X = axial travel

📐 Contact our engineering team for custom length calculations based on your application requirements.

Product Features & Advantages

Product Structure

1. Telescopic Spline Shaft – Allows axial length adjustment to accommodate variable shaft spacing .

2. Universal Joint Ends – Single or double joint design for angular misalignment up to 45°.

3. H7 Precision Bore – High concentricity, accurate shaft fit.

4. Keyway, Hexagon, or Square Hole – Customizable connection types.

💡 The telescopic spline design allows the coupling to be extended or retracted to accommodate axial displacement – making it ideal for applications with variable shaft spacing, thermal expansion, or installation/removal requirements.

Applications

• General Machinery – Power transmission with variable shaft spacing

• Food & Beverage Equipment – Hygienic, reliable drives

• Farms & Agriculture – Adjustable drive shafts

• Home Use Equipment – Compact, flexible drives

• Retail Equipment – Display and handling systems

• Packaging Machinery – Adjustable roller spacing

• Textile Machinery – Variable length drives

• Construction Equipment – Machines with adjustable components

Why Choose Apex Coupling for WSP Telescopic Universal Joints?

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.

Q: What materials are used?
A: The WSP series is manufactured from 42CrMo alloy steel – offering high strength, toughness, and excellent fatigue resistance.

Q: What is the bore tolerance?
A: Standard finished bore tolerance is H7 for precision shaft fit.

Q: What bore types can I get?
A: We offer keyway, hexagon hole, square hole, and plain round hole. Custom bore types available on request.

Q: How is the telescopic length calculated?
A: The installation length L and travel X are calculated using the formulas: Xs = (Lmax – 2·L2 – B) / 2 and Lmin ≥ (Lmax + 2·L + B) / 2. Contact our engineering team for custom calculations .

Q: What is the surface treatment?
A: Standard surface treatment is black oxide (blacking) for corrosion resistance.

Request a Quote

Send us your configuration (single/double), torque requirement, speed, length/travel range, bore type, and bearing type. Our engineers will recommend the optimal model and provide a quotation within 24 hours.