The NATIONAL 11.500x13.000x0.750 M/L Leather Oil Seal (Part No. N-55077) is engineered for extra-large rotating equipment where durability, reliability, and long service life are critical. It is widely used in heavy industrial machinery, mining operations, steel manufacturing, marine equipment, hydroelectric systems, cement plants, and restoration projects requiring traditional leather sealing technology.

The M/L Profile incorporates a reinforced steel outer case combined with a genuine leather sealing lip, providing a proven sealing solution capable of operating under harsh industrial conditions including dusty, muddy, abrasive, and high-load environments.

Unlike synthetic rubber seals, genuine leather naturally absorbs lubricating oil and continuously forms a microscopic lubricating film between the sealing lip and rotating shaft. This self-lubricating property minimizes friction, reduces shaft wear, and significantly extends the service life of both the seal and rotating components.

Leather sealing lips also conform naturally to shafts with minor wear, making them highly suitable for older machinery, refurbished equipment, and large rotating shafts where maintaining original OEM sealing performance is essential.

Manufactured using premium genuine leather and a reinforced steel case, this oil seal is compatible with:

• Mineral oils
• Gear oils
• Bearing grease
• Industrial lubricating oils
• Petroleum-based lubricants

With dimensions of 11.500 × 13.000 × 0.750 inch, this oil seal is commonly installed in large industrial gearboxes, rolling mills, mining equipment, marine propulsion systems, hydroelectric generators, steel processing equipment, paper mills, cement plants, and heavy-duty OEM rotating machinery.

⚙️ Applications

• Large industrial gearboxes
• Steel mills
• Rolling mills
• Mining equipment
• Marine propulsion systems
• Hydroelectric generators
• Paper mills
• Cement plants
• Heavy industrial machinery
• OEM rotating equipment

🎯 Benefits

✔ Genuine leather sealing technology

✔ Excellent lubricant retention

✔ Superior shaft adaptability

✔ Suitable for worn shaft surfaces

✔ Performs well in dusty environments

✔ Long service life

✔ Excellent bearing protection

✔ Ideal for restoration projects

✔ OEM quality replacement

🧠 Technical Insight

• M/L Metal Case + Leather Lip Design
• Genuine Leather Sealing Element
• Reinforced Steel Case Construction
• Self-Lubricating Leather Technology
• Compatible with Oil & Grease
• Excellent Shaft Conformability
• Designed for Large Industrial Equipment
• Traditional Heavy-Duty Sealing Solution

✅ Key Features

• NATIONAL Industrial Quality
• Part No. N-55077
• M/L Leather Profile
• Genuine Leather Sealing Lip
• Reinforced Steel Case
• Heavy Duty Construction
• OEM Replacement Ready
• Long Service Life

📊 Specifications

Brand: NATIONAL

Part Number: N-55077

Model: M/L

Size: 11.500 × 13.000 × 0.750 inch

Type: Leather Rotary Shaft Oil Seal

Material: Genuine Leather

Case Material: Steel

Profile: M/L

Construction: Metal Case + Leather Lip

Lip Design: Genuine Leather Sealing Lip

Spring Type: None

Shaft Diameter (ID): 11.500 inch

Housing Diameter (OD): 13.000 inch

Width: 0.750 inch

Lubrication: Oil & Grease

Temperature Range: Depends on lubricant and operating conditions

Application Class: Heavy Duty Industrial Service

Standard: Inch Size Oil Seal

🔁 Equivalent

Suitable replacement for:

• SKF Leather Oil Seal
• CR Chicago Rawhide Leather Seal
• Garlock Leather Oil Seal
• TROSTEL Leather Oil Seal
• SCHNIEDER Leather Oil Seal
• REPCO Leather Oil Seal
• STEMCO Leather Oil Seal
• KACO Leather Oil Seal
• DICHTOMATIK Leather Oil Seal
• OEM Leather Rotary Shaft Oil Seal

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

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for industrial maintenance, gearbox overhaul, mining equipment repair, steel mill maintenance, marine equipment service, restoration projects, 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