SKF 12361 LDS & Small Bore Seal Instruction Manual

1. Product Overview

The SKF 12361 is a high-quality LDS (Lip-Type) and Small Bore Seal designed for various industrial applications. This seal features a 0.188 inch width and a 1.752 inch outer diameter, making it suitable for specific shaft and bore dimensions. It is a grease seal with an HM21 seal design, utilizing Nitrile Rubber for its lip material, and is configured as a single lip with a spring for effective shaft sealing.

Image 1.1: A close-up view of the SKF 12361 LDS & Small Bore Seal, showcasing its green outer casing and black rubber lip. This seal is designed for effective containment of lubricants and exclusion of contaminants in rotating shaft applications.

Key Features:

• 0.188 Inch Width: Designed for precise fitment in specific applications.
• 1.752 Inch Outer Diameter: Ensures compatibility with corresponding bore sizes.
• Grease Seal: Optimized for retaining grease lubricants.
• HM21 Seal Design: A specific design configuration for reliable sealing performance.
• Nitrile Rubber Lip Material: Provides good resistance to oils, fuels, and other chemicals, suitable for a wide range of temperatures.

2. Technical Specifications

3. Installation Guidelines

Proper installation is crucial for the optimal performance and longevity of the SKF 12361 seal. Follow these guidelines carefully:

1. Preparation: Ensure the shaft and bore surfaces are clean, free from burrs, scratches, or any contaminants. A smooth, clean surface is essential for effective sealing.
2. Lubrication: Lightly lubricate the seal lip and the shaft with the same lubricant that will be sealed. This aids in installation and prevents initial dry running.
3. Tooling: Use appropriate installation tools to press the seal squarely into the bore. Avoid using sharp objects or hammers directly on the seal, as this can deform or damage the seal body and lip.
4. Alignment: Ensure the seal is installed perpendicular to the shaft and fully seated in the bore. Misalignment can lead to premature wear and leakage.
5. Shaft Entry: When sliding the seal over the shaft, protect the seal lip from sharp edges, keyways, or splines. Use a protective sleeve or tape if necessary.
6. Inspection: After installation, visually inspect the seal to ensure it is not twisted, creased, or damaged.

4. Application Considerations

To ensure the SKF 12361 seal performs as expected, consider the following application factors:

• Operating Temperature: Nitrile Rubber (NBR) seals are generally suitable for temperatures ranging from approximately -40°C to +100°C (-40°F to +212°F). Exceeding these limits can lead to material degradation and seal failure.
• Chemical Compatibility: NBR offers good resistance to petroleum-based oils and greases, water, and some hydraulic fluids. However, it has poor resistance to ozone, ketones, esters, and chlorinated hydrocarbons. Verify compatibility with the specific media being sealed.
• Pressure: This seal is primarily designed for low-pressure applications. High pressure can cause the seal lip to deform or extrude, leading to leakage. Consult SKF technical data for specific pressure ratings if the application involves significant pressure.
• Shaft Speed: The maximum permissible shaft speed depends on various factors including shaft finish, temperature, and lubrication. Ensure the application's shaft speed is within the recommended limits for NBR lip seals to prevent excessive heat generation and wear.
• Surface Finish: The shaft surface finish (roughness) is critical. A finish that is too rough will cause rapid lip wear, while one that is too smooth may not retain sufficient lubricant, leading to dry running and heat build-up.

5. Maintenance and Inspection

Regular inspection and proper maintenance practices can extend the life of your SKF 12361 seal and prevent unexpected failures.

• Visual Inspection: Periodically check the area around the seal for any signs of leakage, which indicates seal failure. Also, look for visible damage or hardening of the seal material.
• Lubricant Levels: Ensure that the system maintains adequate lubricant levels. Insufficient lubrication can lead to increased friction, heat, and premature seal wear.
• Contamination: Monitor for signs of external contamination entering the system, which can abrade the seal lip.
• Replacement: Seals are wear components and have a finite lifespan. Replace seals at recommended service intervals or at the first sign of leakage or degradation. Always replace with a new seal; do not reuse old seals.
• Storage: Store new seals in their original packaging in a cool, dry, and dark environment, away from direct sunlight, ozone-generating equipment, and sources of heat. This prevents premature aging of the rubber material.

6. Troubleshooting Common Issues

If you encounter issues with your SKF 12361 seal, consider the following common problems and their potential causes:

7. Warranty Information

SKF products are manufactured to high-quality standards. Specific warranty terms and conditions for the SKF 12361 seal are typically provided by the manufacturer or the authorized distributor at the time of purchase. Please retain your proof of purchase for any warranty claims.

For detailed warranty information, please refer to the official SKF website or contact your local SKF representative.

8. Support and Contact Information

For further technical assistance, product inquiries, or support regarding the SKF 12361 seal, please contact SKF directly:

• SKF Official Website: Visit www.skf.com for product catalogs, technical documentation, and contact details for your region.
• Customer Service: Refer to the 'Contact Us' section on the SKF website for phone numbers and email addresses of their customer support teams worldwide.
• Authorized Distributors: Contact the authorized SKF distributor from whom you purchased the product for local support and service.