The NATIONAL Oil Seal 2.250x3.254x0.594 M/L/R NBR is designed for rotating machinery requiring reliable lubricant retention around a 2.250-inch shaft.

Installed between the rotating shaft and stationary housing, the seal forms controlled contact with the shaft surface. This helps reduce leakage of oil or compatible grease while limiting the entry of dust, dirt, moisture, and abrasive contamination into the bearing, gearbox, pump, transmission, or drive assembly.

The seal is identified by the manufacturer-specific M/L/R Profile. This profile designation may refer to a specialized composite arrangement involving a metal-supporting structure, one or more elastomeric sealing elements, and additional reinforcing or exclusion features. However, the exact meaning and sequence of M/L/R can vary according to the manufacturer and production series.

For this reason, the following details should be verified against the original seal or technical cross-section:

• Exact number of sealing lips
• Primary-lip orientation
• Presence and position of an auxiliary lip
• Outside-case construction
• Internal reinforcement
• Spring arrangement
• Dust-exclusion function
• Installation direction

Manufactured from NBR (Nitrile Butadiene Rubber), the sealing element is generally compatible with:

• Mineral oils
• Gear oils
• Hydraulic oils
• Bearing grease
• Petroleum-based lubricants
• General industrial lubricating fluids

NBR provides good resistance to petroleum-based oils, grease, abrasion, and mechanical wear 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 inch dimensions correspond approximately to:

Shaft diameter: 2.250 inches or 57.15 mm

Housing diameter: 3.254 inches or 82.65 mm

Seal width: 0.594 inch or 15.09 mm

The 0.594-inch width indicates a comparatively substantial seal section that may be intended for a dedicated gearbox, bearing housing, transmission, axle assembly, pump, or OEM machine. Accurate dimensional measurement and full M/L/R profile verification are essential before replacement.

⚙️ Applications

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

🎯 Benefits

✔ Helps retain oil or compatible grease

✔ Protects bearings and rotating components

✔ Oil-resistant NBR sealing material

✔ Suitable for 2.250-inch shaft assemblies

✔ Reinforced heavy-duty construction

✔ Good resistance to wear and abrasion

✔ Suitable for maintenance and overhaul work

✔ Supports longer bearing service life

✔ OEM replacement ready when dimensions and profile match

🧠 Technical Insight

• NATIONAL M/L/R Seal Reference
• Inch-Size Rotary Shaft Seal
• NBR Sealing Material
• Manufacturer-Specific Composite Profile
• Reinforced Lubricant-Retention Design
• Low-Pressure Rotary Shaft Application
• 57.15 mm Shaft Diameter
• Full M/L/R Cross-Section Verification Required

✅ Key Features

• NATIONAL Industrial Quality
• M/L/R Profile Reference
• Oil-Resistant NBR Material
• Reinforced Rotary Shaft Construction
• Heavy-Duty Inch-Size Dimensions
• Suitable for Compatible Oil and Grease
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: NATIONAL

Model: M/L/R

Size: 2.250 × 3.254 × 0.594 inch

Metric Equivalent: Approximately 57.15 × 82.65 × 15.09 mm

Type: Heavy-Duty Industrial Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: M/L/R

Construction: Manufacturer-Specific Reinforced Composite Shaft-Seal Construction

Lip Design: M/L/R profile; exact lip arrangement must be verified against the original seal

Dust Lip: Verify from the actual M/L/R cross-section

Spring Type: Verify from the actual seal construction

Shaft Diameter (ID): 2.250 inches / 57.15 mm

Housing Diameter (OD): 3.254 inches / approximately 82.65 mm

Width: 0.594 inch / approximately 15.09 mm

Pressure Capability: Low-pressure rotary shaft-sealing service unless otherwise specified

Lubrication: Oil and compatible grease

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

Application Class: Heavy-Duty Industrial and Legacy Equipment

Standard: Inch-Size Industrial Seal

🔁 Equivalent

Suitable replacement for compatible:

• NATIONAL M/L/R Rotary Shaft Seal
• 2.250x3.254x0.594 Oil Seal
• 57.15x82.65x15.09 Rotary Seal
• Inch-Size NBR Oil Seal
• 2.250-Inch Shaft Oil Seal
• Industrial Bearing Housing Seal
• Industrial Gearbox Shaft Seal
• Transmission Shaft Seal
• OEM M/L/R Shaft Seal
• Heavy-Duty Rotary Shaft Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/L/R cross-section, lip arrangement, lip orientation, outside-case construction, internal reinforcement, spring configuration, and material compound.

(Always verify dimensions, M/L/R profile geometry, sealing-lip arrangement, spring construction, 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, pump repair, transmission servicing, agricultural and construction machinery maintenance, legacy-equipment 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