Allen-Bradley MPL-SSN-A6B6 Shaft Seal Kit — Detailed Specifications, Product Overview, Applications, Advantages, and Related Models

1. Product Overview

The Allen-Bradley MPL-SSN-A6B6 is a mechanical shaft seal accessory intended for compatible servo motors in the MP-Series family. Its primary purpose is to help maintain the sealing interface around the motor shaft, reducing the entry of dust, particles, and other contaminants through the shaft opening.

Unlike a servo motor or servo drive, this product is a mechanical replacement component. It does not have its own rated voltage, electrical power, encoder, brake, or control interface. Its performance depends on the correct motor compatibility, seal dimensions, shaft condition, material suitability, and installation quality.

The MPL-SSN-A6B6 is associated with the MPL-B6xx motor family and may also be listed for certain compatible medium-inertia motor configurations. Because the correct seal depends on the exact shaft and housing arrangement, the complete motor catalog number should be checked before ordering.

A shaft seal may be small relative to the motor, but it serves a useful maintenance function. A worn or damaged seal can allow contamination to enter the shaft area, while an incorrectly sized replacement may fail to seal properly or may cause excessive friction.

2. Technical Specifications

Important measurement note: The 40 × 90 × 8 mm dimensions describe the seal’s inner diameter, outer diameter, and width, not the complete motor or shipping package. The 0.5 kg figure is a reference weight for the listed kit; confirm the actual supplied item before using it for shipping or inventory records.

3. Dimensions and Weight

MPL-SSN-A6B6

40 × 90 × 8 mm

Inner diameter × outer diameter × width

Reference weight: 0.5 kg

Actual kit and package weight should be verified.

The dimensions are important when selecting a replacement seal. The inner diameter must suit the shaft and sealing arrangement, while the outer diameter must fit the designated housing or seal seat. The width must also match the available installation space.

A seal that is too small may not fit correctly, while one that is too large may fail to seat or seal properly. Even when the nominal dimensions match, the material, shaft finish, and exact motor compatibility should be checked.

4. Product Introduction and Operating Principle

The MPL-SSN-A6B6 is a mechanical accessory designed to help maintain the sealing interface around a compatible servo motor shaft. Its sealing lip contacts the appropriate shaft surface and helps limit the entry of moisture and particles through the shaft opening.

The kit uses nitrile rubber, a material commonly used for industrial seals because of its resistance to many oils and lubricants. However, the seal’s suitability depends on the actual chemical exposure, operating temperature, shaft condition, and service environment.

The shaft seal is a wear component. Continuous rotation, friction, contamination, improper installation, and deterioration of the sealing lip can gradually reduce its effectiveness. Regular inspection and timely replacement help maintain the intended protection.

The MPL-SSN-A6B6 does not alter the motor’s torque, speed, electrical rating, feedback, or braking performance. Its value lies in maintaining the motor’s mechanical sealing arrangement.

5. Main Advantages

5.1 Helps protect the shaft opening

The seal provides a physical barrier that helps reduce contamination entering through the shaft opening. This is useful in machinery exposed to airborne particles, grease, oil mist, or other industrial residue.

5.2 Supports preventive maintenance

Replacing a worn seal can help restore the intended sealing arrangement without replacing the entire motor, provided that the shaft and surrounding components remain in good condition.

5.3 Nitrile rubber construction

Nitrile rubber is commonly used in industrial sealing applications involving compatible oils and lubricants. It provides a practical sealing material for many standard operating environments.

5.4 Defined motor compatibility

The A6B6 designation helps maintenance personnel identify the appropriate seal-kit family for compatible motor configurations. This is safer than selecting a generic seal based solely on visual similarity.

5.5 Compact mechanical component

Although the seal is small compared with the motor, its correct dimensions and installation are important to the complete assembly. It can be stored as a maintenance spare and replaced when inspection indicates wear or damage.

5.6 Helps reduce avoidable maintenance issues

A properly selected and installed seal can help limit contamination-related problems. It cannot compensate for a damaged shaft, incorrect installation, unsuitable chemicals, or an enclosure that is not appropriate for the operating environment.

6. Typical Applications

Packaging and converting machinery

Servo motors may control indexing, feeding, cutting, sealing, and positioning. Maintaining the shaft seal helps protect the shaft opening in environments where dust and production residue are present.

Machine tools and precision equipment

Servo-driven axes may operate near machining particles and lubricants. Shaft-seal inspection is one part of keeping the motor assembly in serviceable condition.

Automated assembly systems

In systems that perform repetitive movement, transfer, or indexing, shaft-seal replacement can be included in scheduled maintenance when the motor design and operating conditions require it.

Material handling equipment

Conveyors and automated handling systems may expose motor assemblies to dust, grease, or other residue. An intact seal helps protect the shaft opening within the limits of the seal and motor design.

The seal should not be considered a substitute for a properly rated motor enclosure. For heavy washdown, immersion, or exposure to aggressive chemicals, verify that the complete motor and sealing arrangement are suitable for the application.

7. Brand and Product Series

The MPL-SSN-A6B6 is a mechanical accessory rather than a motor, servo drive, or controller. It has no independent rated torque, speed, voltage, output power, encoder, or brake.

8. Five Related Models in the Same Accessory Family

The following five models are related shaft seal kits intended for different motor-frame groups. They are useful when servicing other compatible motors, but they should not be treated as interchangeable with the MPL-SSN-A6B6.

The dimensions refer to the seal itself. Exact kit weights and package dimensions for the related models are not confirmed here and should be checked against the actual supplied items.

Model selection guidance

– MPL-SSN-A3B3: For compatible A3xx and B3xx motor configurations.

– MPL-SSN-A4B4: For compatible A4xx and B4xx configurations.

– MPL-SSN-A5B5: For compatible A45xx and B45xx configurations.

– MPL-SSN-F165: For the specified 520, 540, and 560 motor-frame configurations.

– MPL-SSN-A8B8: For compatible B8xx motor configurations.

The correct replacement should be selected using the complete motor catalog number and the corresponding seal-kit specification. Similar-looking seals may have different dimensions and are not necessarily suitable substitutes.

9. Five Popular Related Products from the Same Brand

The following products represent common categories within industrial automation: servo motors, programmable controllers, communication modules, and motion-control hardware. They are broader automation products rather than direct substitutes for the MPL-SSN-A6B6.

Dimensions and weights depend on the exact model configuration and hardware revision. Where a dependable exact value is not established here, it is marked for verification rather than estimated.

Product descriptions

MPL-B330P-MJ72AH

A low-inertia servo motor used for controlled rotary motion in compatible automation systems. It may be relevant when maintaining or configuring an MP-Series installation. Confirm the exact catalog number, shaft configuration, feedback type, and drive compatibility before selecting it.

MPL-B4560F-SJ72AH

A larger-frame servo motor configuration intended for controlled rotary movement. Its frame and stack dimensions describe the motor’s configuration, not its shipping package. Confirm the exact mechanical drawing and mounting requirements before planning a replacement.

1756-L83E

A programmable controller used for machine logic, sequencing, and coordination of automation processes. It belongs to the control-system category rather than the mechanical-accessory category.

1756-EN2TR

An industrial communication module that provides EtherNet/IP connectivity in compatible controller systems. Selection depends on the controller platform, network architecture, and application requirements.

2094-BC02-M02

A motion-control module used in compatible Kinetix 6000 servo systems. Its suitability depends on the system architecture, power requirements, axis configuration, and motor compatibility.

For cabinet planning, mounting, or freight declarations, use the exact mechanical drawing and hardware documentation. Generic estimates should not be treated as guaranteed dimensions or weights.

10. Installation and Maintenance Recommendations

Before replacing the shaft seal, isolate the equipment from its power source and follow the appropriate maintenance procedure. Servo systems may present electrical and mechanical hazards even when the motor is not actively moving.

Inspect the shaft and seal housing for scoring, corrosion, wear grooves, or other damage. A new seal may not restore effective sealing if the shaft surface is damaged.

Keep the replacement seal clean and avoid damaging its sealing lip during installation. Use the specified lubricant and installation procedure, and do not introduce unverified grease or cleaning chemicals that may be incompatible with nitrile rubber.

After installation, confirm that the seal is seated correctly and inspect the area for leakage, displacement, or unusual friction. Where the equipment is maintained under a preventive maintenance program, record the motor catalog number, replacement date, and inspection results.

11. Product Selection Checklist

• Confirm the complete servo motor catalog number.
• Verify compatibility with the MPL-B6xx family or another explicitly listed compatible configuration.
• Check the seal dimensions: 40 mm inner diameter, 90 mm outer diameter, and 8 mm width.
• Inspect the shaft and housing for wear or damage.
• Confirm material compatibility with the operating temperature, lubricant, and chemical exposure.
• Follow the correct installation procedure and lubricant requirements.
• Verify the actual kit weight and package dimensions if required for shipping or inventory.
• Do not substitute a different seal solely because its appearance is similar.

12. Overall Product Assessment

The Allen-Bradley MPL-SSN-A6B6 is a mechanical maintenance accessory designed to help preserve the shaft-sealing arrangement of compatible MP-Series servo motors. Its main benefits are its defined motor-family compatibility, nitrile rubber construction, and role in reducing contamination at the shaft opening.

The most important selection factor is correct fit. The seal has no independent electrical or motion-control rating, and its effectiveness depends on the motor configuration, shaft condition, installation quality, and surrounding environment.

For maintenance and inventory purposes, the seal’s nominal dimensions are 40 × 90 × 8 mm, and the reference kit weight is approximately 0.5 kg. Confirm the actual supplied item’s weight and package dimensions whenever precise shipping or storage measurements are needed.