BSL Single Lip

Top-tier spring-energized rotary shaft seal featuring a precisely ground metal outer diameter, ideal for retaining oil or grease.

This model stands out as the most cost-effective solution for general rotary sealing needs. Its engineered seal lip, paired with a garter spring, ensures consistent radial lip pressure for superior sealing performance. The metal casing is directly exposed to environmental elements and fluids. However, applying an optional sealant coating to the casing enhances static sealing and boosts corrosion resistance between the housing and the seal’s outer diameter.

Application Limits

• Maximum pressure: 0.05 MPa
• NBR temperature range: -40 to 80°C (short-term up to 100°C), max speed: 10 m/s
• FKM temperature range: -25 to 200°C, max speed: 34 m/s

Media Resistance

NBR:

• Resistant to various mineral oils and greases
• Limited resistance to ozone, weathering, and aging

FKM:

• Resistant to mineral and synthetic oils, fuels, and flame-retardant fluids
• Excellent resistance to ozone, weathering, and aging

Design Guidelines

• Design installation space according to DIN 3760
• Ensure shaft roundness (tolerance class IT8) and appropriate surface roughness (Rz = 1.0 to 4.0 µm)
• Shaft surface hardness should be at least 45 HRC
• Housing surface roughness: Rz = 10 to 20 µm
• Shaft tolerance zone: ISO h11; housing tolerance zone: ISO H8

Installation Guidelines

• Thoroughly clean the installation area before assembly
• Avoid pulling the seal over sharp edges; use a mounting sleeve if necessary
• Do not grease the seal or installation space
• Ensure careful, non-tilted installation on the shaft

Storage Advice

• Store at temperatures below 25°C
• Avoid direct heat sources, sunlight, and condensation
• Protect from ozone or ionizing radiation
• Follow ISO 2230 storage recommendations