The AKRON Gamma Seal RB-75 75x95x5.5 RB NBR is an axial face seal designed primarily to protect rotating shafts, bearings, and conventional radial oil seals against external contaminants.

Unlike a conventional radial oil seal installed inside the housing bore, a Gamma Seal is typically mounted directly onto the rotating shaft. The metal carrier and elastomer component rotate with the shaft, while the flexible sealing lip contacts a stationary counterface in the axial direction.

This axial sealing action creates an effective protective barrier against:

• Dust and dirt
• Moisture
• Water splash
• Mud
• Grease contamination
• Abrasive particles
• General environmental contaminants

The RB-75 Profile generally consists of an elastomer sealing element retained and protected by a metal carrier. The metal component provides mechanical support and shields the sealing lip, while the NBR section maintains controlled axial contact against the stationary surface.

Gamma seals are commonly installed as auxiliary protection in front of a conventional radial shaft oil seal. This arrangement helps reduce direct exposure of the primary seal to mud, dust, moisture, and abrasive particles, supporting a longer service life for bearings and the complete sealing system.

Depending on the installation arrangement, the seal may also help retain grease or exclude water splash and low-pressure contaminants. It is not normally intended to replace a pressure-rated hydraulic seal or mechanical seal.

Manufactured with an NBR (Nitrile Butadiene Rubber) sealing element, the seal is generally suitable for applications involving:

• Bearing grease
• Mineral oil exposure
• Gear oil splash
• Petroleum-based lubricants
• Water splash
• Dust and dirt
• General industrial contamination

NBR provides good resistance to oil, grease, wear, and abrasion under standard industrial operating conditions. Compatibility should be confirmed before use with aggressive chemicals, high continuous temperatures, ozone-rich environments, or specialized synthetic lubricants.

The metric dimensions are:

Shaft diameter: 75 mm

Maximum outside diameter: 95 mm

Overall width: 5.5 mm

The compact 5.5 mm axial width makes the seal suitable for shaft assemblies where installation space is limited but additional bearing and seal protection is required.

⚙️ Applications

• Bearing protection systems
• Industrial gearboxes
• Electric motors
• Agricultural machinery
• Construction equipment
• Conveyor drive assemblies
• Power transmission systems
• Industrial fans and blowers
• Axle and hub assemblies
• OEM rotating machinery

🎯 Benefits

✔ Helps exclude dust, dirt, and moisture

✔ Protects bearings and primary radial oil seals

✔ Axial sealing contact against a stationary surface

✔ Oil-resistant NBR sealing material

✔ Protective metal-carrier construction

✔ Compact 5.5 mm axial width

✔ Suitable for contaminated industrial environments

✔ Simple shaft-mounted installation concept

✔ Supports longer bearing and sealing-system life

🧠 Technical Insight

• AKRON RB-75 Gamma Seal Reference
• Axial Face-Sealing Principle
• Shaft-Mounted Rotary Construction
• Metal Carrier + NBR Sealing Element
• Rotates Together with the Shaft
• Lip Contacts a Stationary Counterface
• Contamination Exclusion and Bearing Protection
• Installation Position and Counterface Must Be Verified

✅ Key Features

• AKRON Industrial Quality
• RB-75 Profile
• Gamma-Type Axial Rotary Seal
• Oil-Resistant NBR Material
• Protective Metal Carrier
• Compact Metric Dimensions
• Auxiliary Primary-Seal Protection
• OEM Cross-Reference Ready

📊 Specifications

Brand: AKRON

Model: RB-75

Product Type: Gamma Seal

Size: 75 × 95 × 5.5 mm

Type: Axial Rotary Shaft Seal / Axial Face Seal

Material: NBR (Nitrile Butadiene Rubber)

Carrier Material: Metal

Profile: RB

Profile Reference: RB-75

Construction: Metal Carrier + Elastomer Axial Sealing Element

Sealing Direction: Axial contact against a stationary counterface

Rotating Component: Metal carrier and elastomer element rotate with the shaft

Dust Protection: Yes

Spring Type: None

Shaft Diameter (ID): 75 mm

Maximum Outside Diameter: 95 mm

Overall Width: 5.5 mm

Pressure Capability: Non-pressure or low-pressure contamination-exclusion service

Primary Function: Protection against dust, dirt, moisture, mud, and water splash

Secondary Function: Protection of bearings and conventional radial oil seals

Lubrication: Compatible grease and incidental oil exposure

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

Application Class: Industrial Bearing and Rotary Equipment Protection

Standard: Metric RB-Type Gamma Seal

🔁 Equivalent

Suitable replacement for compatible:

• AKRON RB-75 Gamma Seal
• RB-75 75x95x5.5 Gamma Seal
• 75x95x5.5 Axial Shaft Seal
• 75x95x5.5 Axial Face Seal
• NBR Gamma Ring
• Bearing Protection Gamma Seal
• Metal-Carrier Dust Seal
• Auxiliary Rotary Shaft Seal
• Industrial Contamination Exclusion Seal
• OEM RB-75 Gamma Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original RB profile, shaft interference, metal-carrier geometry, lip orientation, counterface position, axial installation distance, material compound, and operating-speed requirements.

(Always verify dimensions, RB-75 profile geometry, shaft diameter, installation direction, counterface condition, axial clearance, lubricant compatibility, rotational speed, temperature, and operating environment before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for bearing protection, gearbox maintenance, electric motor repair, agricultural and construction machinery servicing, conveyor systems, axle assemblies, industrial fans, and compatible OEM replacement applications.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification