The STEMCO 3.250x4.000x0.688 M/R NBR Oil Seal is engineered for heavy-duty rotary shaft applications requiring dependable sealing performance and long service life. It is widely used in truck wheel hubs, axle assemblies, industrial gearboxes, pumps, construction machinery, mining equipment, agricultural machinery, and OEM rotating equipment.

The M/R Profile utilizes a reinforced precision metal case combined with a spring-loaded primary sealing lip. The garter spring maintains consistent radial sealing force against the rotating shaft, ensuring effective lubricant retention while preventing external contaminants from entering the equipment.

Manufactured from premium NBR (Nitrile Butadiene Rubber), the seal provides excellent resistance to:

• Mineral oils
• Gear oils
• Hydraulic oils
• Lubricating grease
• Petroleum-based lubricants

NBR offers excellent flexibility, abrasion resistance, and durability, making it an ideal sealing material for heavy-duty automotive and industrial applications.

With dimensions of 3.250 × 4.000 × 0.688 inch, this oil seal is commonly installed in truck axle assemblies, wheel hubs, industrial gearboxes, pumps, heavy machinery, agricultural equipment, mining machinery, and OEM rotating equipment utilizing inch-size shaft systems.

⚙️ Applications

• Truck wheel hubs
• Axle assemblies
• Industrial gearboxes
• Heavy-duty pumps
• Agricultural machinery
• Construction equipment
• Mining equipment
• Power transmission equipment
• Industrial machinery
• OEM machinery

🎯 Benefits

✔ Excellent lubricant retention

✔ Reliable spring-loaded sealing

✔ High wear resistance

✔ Protects bearings and shafts

✔ Suitable for heavy-duty service

✔ Long service life

✔ OEM quality replacement

✔ Reduces maintenance costs

✔ Reliable industrial and automotive performance

🧠 Technical Insight

• M/R Single Lip Profile
• Precision Metal Case
• Spring Loaded Main Lip
• Premium NBR Material
• Excellent Oil Resistance
• Heavy Duty Construction
• Oil & Grease Compatible
• Reliable Rotary Shaft Sealing

✅ Key Features

• STEMCO Heavy Duty Quality
• M/R Profile Design
• Spring Loaded Construction
• Precision Metal Case
• Premium NBR Material
• Excellent Wear Resistance
• OEM Replacement Ready
• Long Service Life

📊 Specifications

Brand: STEMCO

Model: M/R

Size: 3.250 × 4.000 × 0.688 inch

Type: Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: M/R

Construction: Precision Metal Case

Lip Design: Spring Loaded Main Lip

Dust Lip: None

Spring Type: Garter Spring

Shaft Diameter (ID): 3.250 inch

Housing Diameter (OD): 4.000 inch

Width: 0.688 inch

Pressure Capability: Up to 0.5 Bar

Lubrication: Oil & Grease

Temperature Range: -40°C to +100°C

Application Class: Heavy Duty Automotive & Industrial Service

Standard: Inch Size Oil Seal

🔁 Equivalent

Suitable replacement for:

• SKF Oil Seal
• CR Chicago Rawhide Oil Seal
• National Oil Seal
• NOK Oil Seal
• Freudenberg Oil Seal
• Simrit Oil Seal
• CFW Rotary Shaft Seal
• KACO Oil Seal
• DICHTOMATIK Oil Seal
• OEM Heavy Duty Oil Seal

(Always verify dimensions, seal profile, material, and application requirements before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for truck axle repair, wheel hub overhaul, gearbox maintenance, pump servicing, heavy machinery maintenance, and 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