The NATIONAL Oil Seal 2.188x3.194x0.719 M/F/L Leather is engineered for industrial rotating equipment requiring a robust sealing structure, dependable oil or grease retention, and reliable performance under dusty, abrasive, or demanding operating conditions.

The manufacturer-specific M/F/L Profile indicates a composite sealing construction associated with metal reinforcement, fabric-supported components, and a leather sealing element. The metal portion helps maintain dimensional stability and secure installation, while the fabric reinforcement supports the seal structure under mechanical loading. The leather lip creates controlled contact around the rotating shaft to retain lubricant.

Because M/F/L profile codes are manufacturer-specific, the exact arrangement of the metal case, fabric reinforcement, leather lip, internal support components, and installation direction should be compared with the original seal or technical drawing before replacement.

Genuine leather can absorb a small amount of lubricating oil and maintain a thin lubricating film at the shaft-contact area. This helps reduce dry friction and supports smoother operation under compatible conditions.

Leather also conforms naturally to minor shaft wear and moderate surface irregularities. This makes the seal suitable for older machinery, rebuilt equipment, and restoration applications where the original sealing arrangement should be preserved.

The fabric-reinforced construction can provide additional structural support in applications involving vibration, contamination, and demanding mechanical conditions. The actual fabric composition and treatment should be verified from the original part where operating conditions are critical.

The seal is generally suitable for compatible applications involving:

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

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

The inch dimensions correspond approximately to:

Shaft diameter: 2.188 inches or 55.58 mm

Housing diameter: 3.194 inches or 81.13 mm

Seal width: 0.719 inch or 18.26 mm

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

⚙️ Applications

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

🎯 Benefits

✔ Genuine leather sealing element

✔ Fabric-reinforced heavy-duty construction

✔ Reliable oil and grease retention

✔ Conforms to slightly worn shaft surfaces

✔ Reinforced structure for industrial service

✔ Suitable for dusty and abrasive environments

✔ Good resistance to wear under compatible conditions

✔ Ideal for maintenance and restoration work

✔ OEM replacement ready when dimensions and profile match

🧠 Technical Insight

• NATIONAL M/F/L Seal Reference
• Metal + Fabric + Leather Construction
• Genuine Leather Sealing Element
• Fabric-Reinforced Structural Support
• Industrial Rotary Shaft-Sealing Function
• Suitable for Compatible Oil and Grease
• Approximately 55.58 mm Shaft Diameter
• Full M/F/L Cross-Section Verification Required

✅ Key Features

• NATIONAL Industrial Quality
• M/F/L Composite Profile
• Genuine Leather Sealing Lip
• Fabric-Reinforced Construction
• Metal Structural Support
• Heavy-Duty Inch-Size Design
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: NATIONAL

Model: M/F/L

Size: 2.188 × 3.194 × 0.719 inch

Metric Equivalent: Approximately 55.58 × 81.13 × 18.26 mm

Type: Fabric-Reinforced Leather Rotary Shaft Oil Seal

Sealing Material: Genuine Industrial Leather

Reinforcement Material: Fabric and Metal Components

Profile: M/F/L

Construction: Manufacturer-Specific Metal + Fabric + Leather Seal Construction

Lip Design: Genuine leather sealing lip; verify against the original cross-section

Dust Lip: Verify from the actual M/F/L profile

Spring Type: None unless otherwise shown in the original construction

Shaft Diameter (ID): 2.188 inches / approximately 55.58 mm

Housing Diameter (OD): 3.194 inches / approximately 81.13 mm

Width: 0.719 inch / approximately 18.26 mm

Pressure Capability: Low-pressure lubricant-retention service unless otherwise specified

Lubrication: Mineral oil, gear oil, and compatible grease

Temperature Range: Depends on the leather grade, fabric treatment, 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/F/L Leather Rotary Shaft Seal
• 2.188x3.194x0.719 Leather Oil Seal
• 55.58x81.13x18.26 Rotary Seal
• Fabric-Reinforced Leather Oil Seal
• Industrial Bearing Housing Leather Seal
• Industrial Gearbox Leather Seal
• Heavy-Duty Composite Shaft Seal
• Legacy Equipment Leather Seal
• OEM M/F/L Shaft Seal
• Industrial Leather Rotary Shaft Oil Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/F/L cross-section, metal-case configuration, fabric reinforcement, leather-lip geometry, installation direction, and lubricant compatibility.

(Always verify dimensions, M/F/L profile geometry, leather grade, fabric construction, lip direction, shaft and housing 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, transmission servicing, agricultural and construction machinery repair, mining 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