The NATIONAL Oil Seal 3.000x4.631x0.500 M/L Leather is engineered for industrial rotating equipment where durability, shaft adaptability, and dependable retention of oil or compatible grease are essential.

The M/L Profile combines a reinforced metal outer case with a genuine leather sealing lip. The metal case provides structural strength, dimensional stability, and secure installation within the housing, while the leather lip creates controlled sealing contact around the rotating shaft.

Unlike many synthetic elastomer seals, genuine leather can absorb a small amount of lubricating oil and maintain a thin lubricating film at the shaft contact area. This characteristic helps reduce dry friction and supports smoother operation under suitable operating conditions.

Leather sealing lips naturally conform to minor shaft wear and moderate surface irregularities. This makes the seal particularly suitable for older machinery, refurbished equipment, and restoration applications where retaining the original sealing design is important.

Manufactured from selected industrial leather, this seal is generally compatible with:

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

Leather performance depends on lubricant type, shaft speed, operating temperature, moisture exposure, shaft condition, and environmental factors. These conditions should be verified before installation.

The inch dimensions correspond approximately to:

Shaft diameter: 3.000 inches or 76.20 mm

Housing diameter: 4.631 inches or 117.63 mm

Seal width: 0.500 inch or 12.70 mm

The specific housing diameter indicates that this seal may be intended for a dedicated bearing housing, gearbox, transmission, axle assembly, or OEM industrial machine. Accurate dimensional measurement and M/L profile comparison are essential before replacement.

⚙️ Applications

• Industrial gearboxes
• Bearing housings
• Industrial pumps
• Agricultural machinery
• Construction equipment
• Conveyor drive assemblies
• Mechanical transmissions
• Power transmission equipment
• Legacy industrial machinery
• OEM rotating equipment

🎯 Benefits

✔ Genuine leather sealing technology

✔ Reliable oil and grease retention

✔ Conforms well to slightly worn shafts

✔ Suitable for dusty industrial environments

✔ Reinforced metal case construction

✔ Good resistance to wear and abrasion

✔ Suitable for maintenance and overhaul work

✔ Ideal for legacy and restored machinery

✔ OEM replacement ready when dimensions and profile match

🧠 Technical Insight

• M/L Metal Case + Leather Lip Design
• Genuine Oil-Treated Leather Sealing Element
• Reinforced Metal Case Construction
• Self-Lubricating Leather Characteristics
• Suitable for Compatible Oil and Grease
• Excellent Shaft Conformability
• Approximately 76.20 mm Shaft Diameter
• M/L Profile Verification Required

✅ Key Features

• NATIONAL Industrial Quality
• M/L Leather Profile
• Genuine Leather Sealing Lip
• Reinforced Metal Case
• Springless Seal Construction
• Heavy-Duty Inch-Size Design
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: NATIONAL

Model: M/L

Size: 3.000 × 4.631 × 0.500 inch

Metric Equivalent: Approximately 76.20 × 117.63 × 12.70 mm

Type: Leather Rotary Shaft Oil Seal

Material: Genuine Oil-Treated Industrial Leather

Case Material: Metal

Profile: M/L

Construction: Metal Case + Leather Sealing Lip

Lip Design: Genuine Leather Sealing Lip

Dust Lip: None unless otherwise shown in the original profile

Spring Type: None

Shaft Diameter (ID): 3.000 inches / approximately 76.20 mm

Housing Diameter (OD): 4.631 inches / approximately 117.63 mm

Width: 0.500 inch / approximately 12.70 mm

Pressure Capability: Low-pressure lubricant-retention service

Lubrication: Mineral oil, gear oil, and compatible grease

Temperature Range: Depends on the leather grade, lubricant, shaft speed, and operating conditions

Application Class: Heavy-Duty Industrial and Legacy Equipment

Standard: Inch-Size Industrial Seal

🔁 Equivalent

Suitable replacement for compatible:

• NATIONAL M/L Leather Rotary Shaft Seal
• 3.000x4.631x0.500 Leather Oil Seal
• 76.20x117.63x12.70 Rotary Seal
• TROSTEL Leather Oil Seal
• CR Chicago Rawhide Leather Seal
• GARLOCK Leather Oil Seal
• REPCO Leather Rotary Shaft Seal
• SCHNIEDER M/L Leather Seal
• Industrial Bearing Housing Leather Seal
• OEM Leather Rotary Shaft Oil Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/L cross-section, leather construction, lip orientation, outside-case design, and lubricant compatibility.

(Always verify dimensions, M/L profile geometry, leather grade, lip direction, shaft condition, lubricant compatibility, rotational speed, temperature, and operating conditions before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for gearbox overhaul, bearing-housing maintenance, pump repair, agricultural machinery servicing, construction equipment maintenance, legacy machinery restoration, 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