The TROSTEL Oil Seal 1.875x3.154x0.938 M/R NBR is designed for industrial rotary shaft applications requiring dependable lubricant retention and a robust, wide sealing section around an inch-size shaft assembly.

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

The product is identified by the TROSTEL manufacturer designation M/R. Because industrial seal profile codes are manufacturer-specific, the exact sealing-lip geometry, outside-diameter construction, reinforcing components, spring arrangement, and installation direction should be compared with the original seal or technical drawing before replacement.

The substantial width of 0.938 inch suggests that this seal may use a reinforced or multi-component construction intended for a dedicated housing rather than a conventional narrow oil-seal groove. The complete cross-section should therefore be verified before ordering.

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, wear, and abrasion 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: 1.875 inches or 47.63 mm

Housing diameter: 3.154 inches or 80.11 mm

Seal width: 0.938 inch or 23.83 mm

The specific outside diameter and wide seal section suggest that this product may be intended for a dedicated bearing housing, gearbox, axle, transmission, or OEM industrial machine. Accurate dimensional measurement and M/R profile verification are essential before installation.

⚙️ 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 inch-size shaft assemblies

✔ Wide heavy-duty sealing section

✔ 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

• TROSTEL M/R Seal Reference
• Inch-Size Rotary Shaft Seal
• Wide 0.938-Inch Seal Section
• NBR Sealing Material
• Radial Shaft-Sealing Function
• Lubricant Retention Design
• Approximately 47.63 mm Shaft Diameter
• Full M/R Cross-Section Verification Required

✅ Key Features

• TROSTEL Industrial Quality
• M/R Profile Reference
• Reinforced Rotary Shaft Construction
• Oil-Resistant NBR Material
• Heavy-Duty Inch-Size Dimensions
• Wide Axial Seal Section
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: TROSTEL

Model: M/R

Size: 1.875 × 3.154 × 0.938 inch

Metric Equivalent: Approximately 47.63 × 80.11 × 23.83 mm

Type: Heavy-Duty Industrial Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: M/R

Construction: Manufacturer-Specific Reinforced Wide-Section Shaft-Seal Construction

Lip Design: M/R profile; verify against the original seal

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

Spring Type: Verify from the actual seal construction

Shaft Diameter (ID): 1.875 inches / approximately 47.63 mm

Housing Diameter (OD): 3.154 inches / approximately 80.11 mm

Width: 0.938 inch / approximately 23.83 mm

Pressure Capability: Application dependent; verify against the original equipment requirements

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 Bearing and Rotating Equipment

Standard: Inch-Size Industrial Seal

🔁 Equivalent

Suitable replacement for compatible:

• TROSTEL M/R Rotary Shaft Seal
• 1.875x3.154x0.938 Oil Seal
• 47.63x80.11x23.83 Rotary Seal
• Wide-Section NBR Oil Seal
• Industrial Bearing Housing Seal
• Industrial Gearbox Shaft Seal
• Pump Shaft Oil Seal
• Transmission Shaft Seal
• OEM M/R Shaft Seal
• Heavy-Duty Rotary Shaft Seal

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

(Always verify dimensions, M/R profile geometry, lip direction, spring construction, shaft and housing condition, lubricant compatibility, rotational speed, pressure, 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 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