The REPCO Oil Seal 3.500x4.756x0.938 M/L/L Leather is designed for industrial rotary shaft applications requiring lubricant retention around a 3.500-inch shaft.

Installed between the rotating shaft and stationary housing, the leather sealing element maintains controlled radial contact with the shaft surface. Properly conditioned industrial leather can adapt to minor shaft-surface irregularities and is particularly suitable for machinery originally designed around traditional leather shaft-sealing technology.

The product is identified by the REPCO manufacturer designation M/L/L. This is a manufacturer-specific profile code. The code alone should not be used to determine the number, sequence, or orientation of leather elements. The exact cross-section, leather arrangement, metal-support structure, outside-case construction, lip direction, installation orientation, and internal retaining features must be checked against the original seal or technical drawing.

With a width of 0.938 inch, this seal has a significantly deeper axial section than many conventional leather shaft seals. This may indicate a specialized or multi-element sealing arrangement, but the exact internal construction must be verified from the original cross-section rather than inferred from the profile code alone.

Industrial leather shaft seals are commonly used with:

• Mineral oils
• Gear oils
• Bearing grease
• Petroleum-based lubricants
• Slow-to-moderate shaft speeds
• Older or specialized industrial machinery

Leather sealing elements may perform effectively on slightly worn shaft surfaces when adequately lubricated. However, performance depends strongly on the leather grade, oil treatment, shaft finish, lubrication, temperature, rotational speed, housing alignment, shaft runout, and installation method.

Leather seals should not normally operate dry. Compatibility should also be verified before use with water-rich environments, aggressive chemicals, specialized synthetic lubricants, or elevated temperatures.

The inch dimensions correspond approximately to:

Shaft diameter: 3.500 inches or 88.90 mm

Housing diameter: 4.756 inches or approximately 120.80 mm

Seal width: 0.938 inch or approximately 23.83 mm

The 3.500 × 4.756 × 0.938-inch dimensions make this seal suitable for medium-to-large bearing housings, industrial gearboxes, transmissions, pumps, agricultural machinery, construction equipment, and legacy OEM machinery using a deep-section inch-size leather sealing arrangement.

⚙️ Applications

• Heavy industrial gearboxes
• Bearing housings
• Mechanical transmissions
• Industrial pumps
• Agricultural machinery
• Construction equipment
• Conveyor drive assemblies
• Legacy machine tools
• Vintage industrial equipment
• OEM rotating machinery

🎯 Benefits

✔ Helps retain compatible oil or grease

✔ Uses an industrial leather sealing element

✔ Can adapt to minor shaft-surface irregularities

✔ Suitable for 3.500-inch shaft assemblies

✔ Deep 0.938-inch seal width

✔ Metal-supported heavy-duty construction

✔ Suitable for legacy machinery restoration

✔ Appropriate for maintenance and overhaul work

✔ OEM replacement ready when dimensions and profile match

🧠 Technical Insight

• REPCO M/L/L Seal Reference
• Inch-Size Rotary Shaft Seal
• Oil-Treated Industrial Leather
• Deep-Section Metal-Supported Construction
• Manufacturer-Specific Leather Arrangement
• Adequate Lubrication Required
• 88.90 mm Shaft Diameter
• Exact M/L/L Cross-Section Must Be Verified

✅ Key Features

• REPCO Industrial Quality
• M/L/L Profile Reference
• Industrial Leather Sealing Material
• Metal Support and Case Structure
• Inch-Size 3.500x4.756x0.938 Dimensions
• Deep 23.83 mm Axial Width
• Heavy-Duty Legacy Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: REPCO

Model / Profile: M/L/L

Size: 3.500 × 4.756 × 0.938 inch

Metric Equivalent: Approximately 88.90 × 120.80 × 23.83 mm

Type: Heavy-Duty Industrial Leather Rotary Shaft Seal

Material: Oil-Treated Industrial Leather with Metal Support

Profile: M/L/L

Construction: Manufacturer-Specific Deep-Section Metal-Supported Leather Shaft-Seal Arrangement

Leather Arrangement: Exact number, sequence, orientation, and function of leather elements must be verified from the original cross-section

Lip Design: M/L/L leather profile; verify the exact lip geometry and direction against the original seal

Dust Lip: Verify from the actual M/L/L construction

Spring Type: No spring unless the original seal construction specifically indicates otherwise

Shaft Diameter (ID): 3.500 inches / 88.90 mm

Housing Diameter (OD): 4.756 inches / approximately 120.80 mm

Width: 0.938 inch / approximately 23.83 mm

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

Lubrication: Compatible oil or grease; adequate lubrication is required

Temperature Range: Depends on leather grade, lubricant, shaft speed, and operating conditions; verify against the original application

Speed Consideration: Generally suitable for slow-to-moderate shaft speeds, subject to lubrication, shaft finish, temperature, alignment, runout, and seal construction

Application Class: Heavy-Duty, Legacy, and Specialized Industrial Rotating Equipment

Standard: Inch-Size Specialized Leather Seal

🔁 Equivalent

Suitable replacement for compatible:

• REPCO M/L/L Leather Shaft Seal
• REPCO 3.500x4.756x0.938 Seal
• 88.90x120.80x23.83 Leather Seal
• 3.500-Inch Shaft Leather Seal
• Deep-Section Leather Oil Seal
• Metal-Supported Leather Rotary Seal
• Industrial Bearing Housing Leather Seal
• Heavy Gearbox Leather Shaft Seal
• OEM M/L/L Leather Seal
• Legacy Machinery Rotary Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/L/L cross-section, leather-element arrangement, lip geometry, lip orientation, metal-support structure, outside-case construction, installation direction, leather grade, axial width, and lubrication requirements.

(Always verify dimensions, M/L/L-profile geometry, leather arrangement, lip direction, shaft finish, housing condition, installation depth, available axial space, lubricant compatibility, rotational speed, temperature, runout, and operating conditions before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for heavy gearbox overhaul, bearing-housing maintenance, industrial pump repair, agricultural-machinery repair, construction-equipment maintenance, conveyor-drive servicing, 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