The STEMCO Oil Seal 4.000x5.256x1.063 M/L LEATHER is designed for rotary shaft applications requiring lubricant retention around a 4.000-inch shaft within a 5.256-inch housing bore.

This seal uses an industrial leather sealing element supported by a metal case or structural carrier. Properly conditioned and lubricated leather can conform to the shaft surface and accommodate minor shaft-surface irregularities, making this type of seal particularly useful in older heavy-duty equipment, axle systems, gearboxes, transmissions, agricultural machinery, and legacy industrial applications.

A notable characteristic of this seal is its 1.063-inch axial width, equivalent to approximately 27.00 mm. This is a relatively deep-section configuration compared with many conventional rotary shaft seals.

However, the larger width alone should not be interpreted as evidence of multiple leather lips, multiple leather elements, or any specific internal arrangement. The exact M/L cross-section, leather element geometry, metal support structure, outside-case construction, lip orientation, and installation depth must be verified against the original STEMCO seal or technical drawing.

Leather sealing elements should generally not operate dry. Adequate lubrication at the sealing interface is important to minimize friction, heat generation, hardening, glazing, and premature wear.

Typical compatible lubricant/service environments include:

• Mineral oils
• Gear oils
• Bearing oils
• Axle lubricants
• Bearing grease
• Petroleum-based industrial lubricants

The usable temperature and shaft-speed range depend on leather grade, lubricant type, shaft finish, hardness, alignment, concentricity, runout, and actual operating conditions.

The inch dimensions convert approximately to:

Shaft diameter: 4.000 inches or 101.60 mm

Housing diameter: 5.256 inches or approximately 133.50 mm

Seal width: 1.063 inches or approximately 27.00 mm

The 4.000 × 5.256 × 1.063-inch configuration is suitable for specialized heavy-duty housings and equipment originally engineered around a deep-section leather rotary shaft seal.

⚙️ Applications

• Heavy-duty axle assemblies
• Industrial gearboxes
• Large bearing housings
• Mechanical transmissions
• Agricultural machinery
• Construction equipment
• Heavy industrial drive systems
• Industrial shaft assemblies
• Legacy rotating machinery
• OEM restoration applications

🎯 Benefits

✔ Genuine industrial leather sealing element

✔ Suitable for lubricated rotary shaft applications

✔ Can accommodate minor shaft-surface irregularities

✔ Suitable for 4.000-inch shaft assemblies

✔ Deep 1.063-inch axial section

✔ Metal-supported M/L construction

✔ Well suited to heavy-duty and legacy machinery

✔ Useful for repair, overhaul, and restoration work

✔ Replacement ready when full M/L construction and dimensions match

🧠 Technical Insight

• STEMCO M/L Leather Seal Reference
• Deep-Section Rotary Shaft Seal
• 1.063-Inch / 27.00 mm Axial Width
• Oil-Treated Industrial Leather
• Metal-Supported Seal Construction
• Lubrication Is Essential
• 101.60 mm Shaft Diameter
• Exact M/L Cross-Section Must Be Verified

✅ Key Features

• STEMCO Industrial Seal
• M/L Profile Reference
• Genuine Leather Sealing Element
• Metal-Supported Construction
• Deep Axial Section
• 4.000x5.256x1.063 Dimensions
• Heavy-Duty Legacy Equipment Replacement
• Cross-Reference Support Available

📊 Specifications

Brand: STEMCO

Model / Profile: M/L

Size: 4.000 × 5.256 × 1.063 inch

Metric Equivalent: Approximately 101.60 × 133.50 × 27.00 mm

Type: Deep-Section Industrial Leather Rotary Shaft Oil Seal

Material: Genuine Oil-Treated Industrial Leather

Profile: M/L

Construction: Manufacturer-Specific Metal-Supported Leather Shaft-Seal Construction

Lip Design: Leather sealing lip; verify exact M/L lip geometry and orientation against the original seal or technical drawing

Dust Lip: Not assumed; verify from the actual M/L construction

Spring Type: No spring unless the original STEMCO seal specifically indicates one

Shaft Diameter (ID): 4.000 inches / 101.60 mm

Housing Diameter (OD): 5.256 inches / approximately 133.50 mm

Width: 1.063 inches / approximately 27.00 mm

Section Design: Deep axial section; do not infer multiple lips or leather elements solely from the width

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

Lubrication: Oil or grease lubrication is generally required; leather should not normally operate dry

Temperature Range: Depends on leather grade, lubricant, shaft speed, and actual operating conditions; verify application-specific limits

Speed Consideration: Generally suitable for slow-to-moderate shaft speeds with adequate lubrication; actual allowable speed depends on shaft finish, diameter, lubrication, temperature, and seal construction

Installation Consideration: Because of the deep 27.00 mm section, carefully verify installation depth, housing shoulder geometry, shaft finish, shaft hardness, concentricity, runout, lip orientation, and axial positioning before installation

Application Class: Heavy-Duty Industrial Bearing, Axle, Gearbox, Transmission, and Legacy Rotating Equipment

Standard: Inch-Size Specialized Leather Shaft Seal

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• STEMCO M/L Leather Shaft Seal
• STEMCO 4.000x5.256x1.063 Oil Seal
• 101.60x133.50x27.00 Leather Seal
• 4.000-Inch Shaft Leather Oil Seal
• Deep-Section Leather Shaft Seal
• Metal-Supported Leather Shaft Seal
• Heavy-Duty Axle Leather Seal
• Industrial Gearbox Leather Seal
• Legacy Equipment Oil Seal
• OEM M/L Leather Seal

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

The 1.063-inch width must not be used alone to infer the number or arrangement of leather sealing elements.

(Always verify dimensions, M/L construction, complete cross-section, leather-lip orientation, installation depth, shaft finish, shaft hardness, housing geometry, lubricant compatibility, shaft speed, temperature, concentricity, runout, and operating conditions before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for heavy-duty axle overhaul, large bearing-housing maintenance, industrial gearbox repair, transmission servicing, agricultural-machinery maintenance, construction-equipment repair, 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