The HUMPHREY Cartridge Seal 5.125x6.504x1.438 M/R NBR is engineered for large industrial rotary shaft applications requiring a robust sealing assembly with substantial axial width and dependable lubricant-retention performance.

Unlike a conventional narrow radial oil seal, a cartridge-style seal is typically supplied as a more substantial integrated sealing unit. Depending on the original HUMPHREY construction, the assembly may incorporate a reinforced outer structure, one or more sealing elements, internal support components, or a dedicated running surface.

Installed between the rotating shaft and stationary housing, the sealing element creates controlled radial contact around the shaft or integrated running surface. This helps retain oil or compatible grease while reducing the entry of dust, dirt, moisture, mud, and abrasive contaminants into the bearing, gearbox, axle, or transmission assembly.

The product is identified by the manufacturer-specific M/R Profile. Because cartridge-seal and profile designations vary between manufacturers, the exact cross-section, number of sealing lips, outside-diameter construction, spring arrangement, internal support structure, running-surface configuration, and installation direction must be compared with the original seal or technical drawing before replacement.

Manufactured with an NBR (Nitrile Butadiene Rubber) sealing element, the seal 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 exposure to aggressive chemicals, high continuous temperatures, ozone-rich environments, or specialized synthetic lubricants.

The inch dimensions correspond approximately to:

Shaft diameter: 5.125 inches or 130.18 mm

Housing diameter: 6.504 inches or 165.20 mm

Overall width: 1.438 inches or 36.53 mm

The large shaft diameter and substantial width indicate that this product is likely intended for a dedicated cartridge-seal housing or OEM heavy-equipment assembly rather than a standard narrow oil-seal groove. Accurate measurement and complete cross-sectional verification are essential before installation.

⚙️ Applications

• Large industrial gearboxes
• Axle and hub assemblies
• Bearing housings
• Mechanical transmissions
• Agricultural machinery
• Construction equipment
• Mining and quarry machinery
• Conveyor drive assemblies
• Legacy heavy equipment
• OEM rotating machinery

🎯 Benefits

✔ Integrated cartridge-style sealing construction

✔ Helps retain oil or compatible grease

✔ Protects bearings and rotating components

✔ Oil-resistant NBR sealing material

✔ Large, robust wide-section design

✔ Suitable for demanding industrial service

✔ Good resistance to wear and abrasion

✔ Suitable for maintenance and overhaul work

✔ OEM replacement ready when dimensions and construction match

🧠 Technical Insight

• HUMPHREY Cartridge Seal Reference
• Manufacturer-Specific M/R Profile
• Large Integrated Wide-Section Seal Assembly
• NBR Sealing Element
• Radial Shaft-Sealing Function
• Lubricant Retention and Contamination Exclusion
• Approximately 130.18 mm Shaft Diameter
• Full Cartridge Cross-Section Verification Required

✅ Key Features

• HUMPHREY Industrial Quality
• Cartridge-Style Seal Construction
• M/R Profile Reference
• Oil-Resistant NBR Material
• Large Heavy-Duty Inch-Size Dimensions
• Wide 1.438-Inch Seal Section
• Industrial Replacement Seal
• OEM Cross-Reference Ready

📊 Specifications

Brand: HUMPHREY

Model: M/R

Product Type: Cartridge Seal

Size: 5.125 × 6.504 × 1.438 inch

Metric Equivalent: Approximately 130.18 × 165.20 × 36.53 mm

Seal Type: Heavy-Duty Cartridge-Style Industrial Rotary Shaft Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: M/R

Construction: Manufacturer-Specific Integrated Cartridge-Seal Assembly

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

Dust Lip: Verify from the actual cartridge construction

Spring Type: Verify from the actual seal assembly

Integrated Wear Surface: Verify whether included in the original cartridge design

Shaft Diameter (ID): 5.125 inches / approximately 130.18 mm

Housing Diameter (OD): 6.504 inches / approximately 165.20 mm

Overall Width: 1.438 inches / approximately 36.53 mm

Pressure Capability: Application dependent; verify with 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, Axle and Transmission Equipment

Standard: Inch-Size OEM Cartridge Seal

🔁 Equivalent

Suitable replacement for compatible:

• HUMPHREY M/R Cartridge Seal
• 5.125x6.504x1.438 Cartridge Seal
• 130.18x165.20x36.53 Cartridge Seal
• Large Industrial Axle Cartridge Seal
• Heavy-Duty Bearing Housing Cartridge Seal
• Gearbox Cartridge Oil Seal
• Transmission Cartridge Seal
• NBR Cartridge-Style Shaft Seal
• OEM M/R Cartridge Seal
• Heavy-Duty Rotary Cartridge Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original cartridge cross-section, M/R profile, lip orientation, internal support structure, spring arrangement, running-surface configuration, overall width, and material compound.

(Always verify dimensions, cartridge construction, M/R profile geometry, installation direction, shaft and housing condition, lubricant compatibility, rotational speed, pressure, temperature, and equipment requirements before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for large gearbox overhaul, axle and hub repair, bearing-housing maintenance, transmission servicing, agricultural and construction machinery repair, mining equipment maintenance, legacy machinery restoration, and compatible OEM cartridge-seal 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