The STEFA/TRELLEBORG Oil Seal 1.936x3.146x0.875 M/F Fabric is designed for industrial rotating equipment requiring a robust sealing assembly, controlled lubricant retention, and provision for supplemental grease lubrication.

The manufacturer-specific M/F Profile combines an industrial fabric sealing element with a rigid metal-cased structure. The metal case helps maintain dimensional stability, provides mechanical reinforcement, and supports secure installation within the housing. The fabric element forms the sealing interface around the rotating shaft.

A distinctive feature of this model is the integrated grease lubrication port. This port is intended to provide a pathway for introducing grease into the seal cavity or sealing interface, depending on the original equipment arrangement. Periodic grease supply may help maintain lubrication, reduce dry running, support heat dissipation, and flush minor contaminants away from the contact area.

The lubrication port should be correctly aligned with the corresponding grease passage or fitting in the machine housing. Blocking, misalignment, or incorrect positioning of the port may prevent grease from reaching the intended sealing area.

Because the M/F construction and lubrication-port arrangement are manufacturer-specific, the exact fabric composition, impregnation treatment, sealing geometry, port orientation, internal grease path, installation direction, and metal-case configuration should be compared with the original seal or technical drawing before replacement.

This seal is generally suitable for compatible applications involving:

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

The performance of a fabric seal depends on the fabric composition, impregnation treatment, grease type, lubricant compatibility, shaft speed, temperature, shaft condition, port alignment, lubrication frequency, and operating environment.

The inch dimensions correspond approximately to:

Shaft diameter: 1.936 inches or 49.17 mm

Housing diameter: 3.146 inches or 79.91 mm

Seal width: 0.875 inch or 22.23 mm

The wide 0.875-inch axial section and integrated grease port indicate that this seal is intended for a dedicated industrial housing rather than a conventional narrow oil-seal groove. Accurate measurement, grease-port orientation, and full M/F profile verification are essential before installation.

⚙️ Applications

• Industrial gearboxes
• Grease-lubricated 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

✔ Integrated grease lubrication port

✔ Supports periodic lubrication of the sealing area

✔ Heavy-duty metal-cased construction

✔ Industrial fabric sealing element

✔ Helps retain grease and compatible lubricants

✔ Supports stable installation in dedicated housings

✔ Suitable for demanding industrial environments

✔ Ideal for overhaul and legacy-equipment restoration

✔ OEM replacement ready when dimensions and port orientation match

🧠 Technical Insight

• STEFA/TRELLEBORG M/F Seal Reference
• Metal Case + Fabric Sealing Construction
• Integrated Grease Lubrication Port
• Wide 0.875-Inch Axial Section
• Grease Passage Alignment Required
• Industrial Rotary Shaft-Sealing Function
• Approximately 49.17 mm Shaft Diameter
• Full Cross-Section and Port Verification Required

✅ Key Features

• STEFA/TRELLEBORG Industrial Quality
• M/F Fabric Profile
• Integrated Grease Lubrication Port
• Rigid Metal-Cased Construction
• Industrial Fabric Sealing Element
• Heavy-Duty Inch-Size Design
• Specialized OEM Replacement Seal
• Cross-Reference Assistance Available

📊 Specifications

Brand: STEFA / TRELLEBORG

Model: M/F

Product Description: Metal-Cased Seal with Integrated Grease Lubrication Port

Size: 1.936 × 3.146 × 0.875 inch

Metric Equivalent: Approximately 49.17 × 79.91 × 22.23 mm

Type: Grease-Lubricated Fabric Rotary Shaft Seal

Sealing Material: Industrial Fabric Sealing Material

Case Material: Metal

Profile: M/F

Construction: Metal-Cased Fabric Seal with Integrated Grease Lubrication Port

Lip Design: Manufacturer-specific fabric sealing geometry; verify against the original seal

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

Spring Type: None unless otherwise shown in the original construction

Lubrication Port: Integrated

Lubrication Method: External grease supply through the corresponding housing passage or fitting

Port Orientation: Must align with the original machine lubrication passage

Shaft Diameter (ID): 1.936 inches / approximately 49.17 mm

Housing Diameter (OD): 3.146 inches / approximately 79.91 mm

Width: 0.875 inch / approximately 22.23 mm

Pressure Capability: Low-pressure lubricant-retention service unless otherwise specified by the equipment manufacturer

Lubrication: Grease and compatible industrial lubricants

Temperature Range: Depends on the fabric composition, impregnation treatment, grease type, shaft speed, and operating conditions

Application Class: Heavy-Duty Industrial and Legacy Equipment

Standard: Inch-Size Specialized OEM Seal

🔁 Equivalent

Suitable replacement for compatible:

• STEFA M/F Fabric Rotary Shaft Seal
• TRELLEBORG M/F Fabric Seal
• 1.936x3.146x0.875 Fabric Oil Seal
• 49.17x79.91x22.23 Rotary Seal
• Metal-Cased Grease-Port Seal
• Grease-Lubricated Bearing Housing Seal
• Industrial Fabric Shaft Seal
• Heavy-Duty Gearbox Seal
• OEM Lubrication-Port Shaft Seal
• Legacy Equipment Fabric Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/F cross-section, fabric composition, metal-case configuration, grease-port diameter, port position, internal lubrication path, installation direction, and lubricant compatibility.

(Always verify dimensions, M/F profile geometry, grease-port orientation, housing lubrication passage, fabric construction, shaft and housing condition, grease compatibility, lubrication interval, rotational speed, temperature, and operating conditions before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for gearbox overhaul, grease-lubricated 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