The GAMMA SEAL RB-50 50x70x5.5 RB NBR is intended primarily as an auxiliary exclusion seal for protecting bearings and rotating assemblies from dirt, dust, splash water, and external contamination.

Unlike a conventional radial oil seal, a Gamma-type seal works on the axial face. The metal carrier and elastomer element rotate with the shaft, while the flexible sealing lip contacts a stationary counterface.

For this item, the nominal dimensions are:

Shaft Size: 50 mm

Maximum Outside Diameter: approximately 70 mm

Axial Width: approximately 5.5 mm

The RB profile is manufacturer-specific. Exact shaft interference, carrier geometry, lip shape, orientation, counterface position, and required axial installation distance should be verified against the original GAMMA SEAL specification or existing installation.

The NBR elastomer element is generally suitable for industrial environments involving:

• Mineral oils
• Bearing grease
• Gear oils
• Petroleum-based lubricants
• Water splash
• General dust and contamination exposure

NBR generally offers good resistance to oil, grease, abrasion, and wear. Compatibility should still be verified for aggressive chemicals, certain fuels, synthetic fluids, ozone-rich environments, or continuous high-temperature service.

⚙️ Applications

• Bearing protection
• Electric motors
• Gearboxes
• Conveyor systems
• Agricultural machinery
• Construction equipment
• Industrial fans
• Pumps
• Shaft assemblies
• General rotating equipment

🎯 Benefits

✔ Helps exclude dust and dirt

✔ Helps resist water splash contamination

✔ Protects bearings and internal rotating components

✔ Axial sealing principle reduces dependence on housing bore sealing

✔ Shaft-mounted rotating design

✔ NBR provides good oil and grease resistance

✔ Compact axial installation

✔ Useful as an auxiliary protection seal

✔ Suitable for maintenance and OEM replacement when RB geometry matches

🧠 Technical Insight

• Axial Face Sealing Principle
• Shaft-Mounted Seal
• Metal Carrier + NBR Elastomer
• Rotates Together with Shaft
• Lip Contacts Stationary Counterface
• Primarily Contamination Exclusion
• No Spring Required
• Exact RB Installation Geometry Must Be Verified

✅ Key Features

• GAMMA SEAL RB-50 Reference
• RB Profile
• 50 mm Shaft Size
• Approx. 70 mm Maximum OD
• 5.5 mm Axial Width
• NBR Sealing Element
• Metal Carrier Construction
• Cross-Reference Support Available

📊 Specifications

Brand: GAMMA SEAL

Model / Profile: RB-50 / RB

Size: 50 × 70 × 5.5 mm

Type: Axial Face Seal / Shaft-Mounted Auxiliary Exclusion Seal

Material: NBR Elastomer with Metal Carrier

Profile: RB

Construction: Shaft-mounted metal carrier with elastomer sealing element

Lip Design: Axial sealing lip contacting a stationary counterface

Dust Lip: The axial lip itself performs the contamination-exclusion function

Spring Type: None

Shaft Diameter: 50 mm

Maximum Outside Diameter: approximately 70 mm

Axial Width: approximately 5.5 mm

Pressure Capability: Non-pressure / low-pressure auxiliary sealing service

Primary Function: Dust, dirt, splash-water, and contamination exclusion

Lubrication: Compatible with general oil- and grease-lubricated equipment

Temperature Range: Typically approximately -30°C to +100°C for standard NBR; verify actual compound and operating conditions

Speed Consideration: Permissible speed depends on shaft diameter, lip loading, counterface condition, temperature, runout, and actual seal construction

Installation Consideration: Verify shaft interference, counterface geometry, axial distance, carrier orientation, shaft finish, concentricity, and runout

Application Class: Auxiliary Bearing and Rotating-Equipment Protection

Standard: Manufacturer-Specific GAMMA RB Axial Seal

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• GAMMA SEAL RB-50
• GAMMA RB 50 mm Shaft Seal
• 50x70x5.5 Axial Face Seal
• Shaft-Mounted Dust Seal
• Bearing Protection Seal
• Axial Exclusion Seal
• NBR Gamma-Type Seal
• Metal Carrier Shaft Seal
• Industrial Splash Protection Seal
• OEM RB Profile Seal

Interchangeability cannot be confirmed from nominal dimensions alone. The replacement must also match the original RB profile, shaft interference, carrier geometry, lip geometry, counterface position, installation orientation, axial distance, material, and operating conditions.

(Always verify RB profile, shaft fit, maximum OD, axial width, lip position, counterface condition, installation distance, speed, temperature, runout, and operating environment before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for bearing protection, gearboxes, electric motors, conveyors, agricultural machinery, construction equipment, fans, pumps, and compatible rotating assemblies.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification