The AEROQUIP Oil Seal 3.875x4.881x0.625 M/L Leather is designed for industrial rotating equipment requiring robust construction, dependable lubricant retention, and good conformity to the shaft surface.

The M/L Profile combines a reinforced metal outer case with a genuine industrial leather sealing lip. The metal case helps maintain dimensional stability, supports the leather element, and allows secure installation within the housing. The leather lip creates controlled sealing contact around the rotating shaft to help reduce leakage of oil or compatible grease.

Genuine leather can absorb a small amount of lubricating oil and maintain a thin lubricating film around the shaft-contact area. Under suitable operating conditions, this characteristic helps reduce dry friction and supports smoother sealing performance.

Leather sealing lips can also conform to minor shaft wear and moderate surface irregularities. This makes the seal particularly suitable for older machinery, rebuilt equipment, and restoration applications where maintaining the original sealing configuration is important.

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 performance depends on leather grade, lubricant type, shaft speed, operating temperature, moisture exposure, shaft condition, and environmental conditions. These factors should be checked before installation.

The inch dimensions correspond approximately to:

Shaft diameter: 3.875 inches or 98.43 mm

Housing diameter: 4.881 inches or 123.98 mm

Seal width: 0.625 inch or 15.88 mm

The 0.625-inch axial width and large industrial dimensions indicate that this seal may be intended for a dedicated bearing housing, gearbox, transmission, axle assembly, pump, or OEM heavy industrial machine. Accurate dimensional measurement and M/L-profile verification are essential before replacement.

⚙️ Applications

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

🎯 Benefits

✔ Genuine leather sealing technology

✔ Helps retain oil and compatible grease

✔ Conforms to slightly worn shaft surfaces

✔ Reinforced metal case construction

✔ Suitable for dusty industrial environments

✔ Good wear resistance under compatible conditions

✔ Suitable for maintenance and overhaul work

✔ Ideal for legacy and restored machinery

✔ OEM replacement ready when dimensions and profile match

🧠 Technical Insight

• AEROQUIP M/L Seal Reference
• Metal Case + Leather Lip Construction
• Genuine Oil-Treated Leather Sealing Element
• Springless Rotary Shaft-Seal Design
• Low-Pressure Lubricant Retention
• Good Shaft-Surface Conformability
• Approximately 98.43 mm Shaft Diameter
• M/L Profile Verification Required

✅ Key Features

• AEROQUIP Industrial Quality
• M/L Leather Profile
• Genuine Leather Sealing Lip
• Reinforced Metal Case
• Springless Seal Construction
• Heavy-Duty Inch-Size Design
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: AEROQUIP

Model: M/L

Size: 3.875 × 4.881 × 0.625 inch

Metric Equivalent: Approximately 98.43 × 123.98 × 15.88 mm

Type: Leather Rotary Shaft Oil Seal

Material: Genuine Oil-Treated Industrial Leather

Case Material: Metal

Profile: M/L

Construction: Metal Case + Leather Sealing Lip

Lip Design: Genuine leather sealing lip

Dust Lip: None unless otherwise shown in the original profile

Spring Type: None

Shaft Diameter (ID): 3.875 inches / approximately 98.43 mm

Housing Diameter (OD): 4.881 inches / approximately 123.98 mm

Width: 0.625 inch / approximately 15.88 mm

Pressure Capability: Low-pressure lubricant-retention service

Lubrication: Mineral oil, gear oil, and compatible grease

Temperature Range: Depends on the leather grade, lubricant, shaft speed, moisture exposure, and operating conditions

Application Class: Heavy-Duty Industrial and Legacy Equipment

Standard: Inch-Size Industrial Seal

🔁 Equivalent

Suitable replacement for compatible:

• AEROQUIP M/L Leather Rotary Shaft Seal
• 3.875x4.881x0.625 Leather Oil Seal
• 98.43x123.98x15.88 Rotary Seal
• Industrial Leather Oil Seal
• 3.875-Inch Shaft Leather Seal
• Bearing Housing Leather Seal
• Industrial Gearbox Leather Seal
• Pump Shaft Leather Seal
• OEM M/L Leather Shaft Seal
• Industrial Leather Rotary Shaft Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original M/L cross-section, leather-lip geometry, lip orientation, outside-case construction, installation direction, and lubricant compatibility.

(Always verify dimensions, M/L-profile geometry, leather grade, 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, pump repair, transmission servicing, agricultural machinery maintenance, construction-equipment repair, 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