UJMA50 Universal Joint Coupling – SKF Type Equivalent, High-Strength Alloy Steel, 50mm OD, 25mm ID, 132mm Length

UJMA50 Universal Joint Coupling | 50mm OD | 25mm Bore | 132mm Length | Alloy Steel

What is the UJMA50 Universal Joint Coupling?

UJMA50 is a single universal joint coupling designed to transmit torque between two shafts that are not perfectly aligned.
It allows angular misalignment while maintaining rotational motion and torque transfer.

This model follows the SKF UJMA50 dimensional standard, which means it can be installed in systems that require the same geometry and shaft specifications.

Manufactured from high-strength alloy steel, the joint provides durability, wear resistance, and stable operation in medium-duty industrial and agricultural drive systems.

Technical Specifications

Key Functional Features

Precision Torque Transmission

The cross pin and block mechanism allows smooth torque transfer even when shafts operate at an angle.

Misalignment Compensation

The joint absorbs angular misalignment between shafts without transmitting excessive vibration to connected components.

High Strength Alloy Construction

Alloy steel structure improves fatigue resistance and mechanical strength under cyclic load.

Standardised Dimensions

The geometry follows UJMA series universal joint dimensions, allowing straightforward integration into compatible mechanical systems.

Balanced Rotational Movement

Precision machining minimizes runout and supports stable operation within recommended RPM limits.

Typical Applications

UJMA series universal joints are commonly used in systems where rotational shafts cannot remain perfectly aligned.

Common use cases include:

• industrial machinery drive assemblies
• agricultural equipment and tractor drive systems
• power transmission shafts
• fabrication machinery
• automation systems requiring angular shaft motion
• maintenance replacement for worn universal joints

Mechanical Working Principle

A universal joint coupling connects two rotating shafts through a cross-pin mechanism.

When the driving shaft rotates:

1. the cross pin transfers motion to the driven shaft

2. the joint allows angular deviation between shafts

3. torque continues transmitting despite the angle

This design prevents mechanical binding when shafts are not perfectly collinear.

Installation Considerations

For optimal performance:

• ensure shafts are properly aligned within allowable angle limits
• use correct keyway fitment if maximum bore is used
• avoid exceeding recommended rotational speed
• apply periodic lubrication where required

Correct installation increases the service life of the universal joint.

Compatibility

This model follows UJMA dimensional standards used by multiple industrial manufacturers.
It can be installed in equipment requiring UJMA50 size universal joints with matching shaft diameters.

Always verify:

• shaft bore size
• keyway specification
• mounting clearance

before installation.

Frequently Asked Questions

Is UJMA50 compatible with SKF UJMA series joints?

Yes. The coupling follows the same dimensional standard used by the UJMA50 specification, which allows installation in systems designed for that size.

What material is used in this universal joint?

The joint body and moving components are manufactured from high-strength alloy steel, which improves resistance to fatigue, torsional stress, and mechanical wear.

What shaft misalignment angle can it support?

The joint can operate at:

• up to 25° in powered applications
• up to 35° in manually driven systems

Exceeding these limits can reduce service life.

What speed can this universal joint handle?

Recommended operating speed is up to approximately 1,800 RPM, depending on load conditions and shaft alignment.