The HUMPHREY Oil Seal 2.375x3.375x0.375 SYN NBR is designed for industrial rotary shaft applications requiring lubricant retention around a 2.375-inch shaft within a 3.375-inch housing bore.

Installed between the rotating shaft and stationary housing, the sealing element maintains controlled radial contact with the shaft surface. This helps reduce leakage of compatible oil or grease while protecting bearings, gears, pumps, transmissions, and other internal rotating components from dust, moisture, and external contamination.

The product is identified by the HUMPHREY manufacturer designation SYN. This is a manufacturer-specific profile code. The exact sealing-lip geometry, number of lips, dust-exclusion arrangement, outside-case construction, internal reinforcement, spring configuration, lip orientation, and installation direction should be verified against the original seal, technical drawing, or equipment specification before replacement.

Manufactured from NBR (Nitrile Butadiene Rubber), the sealing element is generally suitable for:

• Mineral oils
• Gear oils
• Hydraulic oils
• Bearing grease
• Petroleum-based lubricants
• General industrial lubricating fluids

NBR provides good resistance to petroleum-based oils, grease, abrasion, and mechanical wear under normal industrial operating conditions. Compatibility should be verified before use with aggressive chemicals, fuels, continuous high temperatures, ozone-rich environments, or specialized synthetic lubricants.

The inch dimensions convert approximately to:

Shaft diameter: 2.375 inches or 60.33 mm

Housing diameter: 3.375 inches or 85.73 mm

Seal width: 0.375 inch or 9.53 mm

The 2.375 × 3.375 × 0.375-inch configuration is suitable for medium-size bearing housings, industrial gearboxes, pumps, transmissions, electric motors, conveyor drives, and legacy equipment using an inch-size shaft-sealing arrangement.

⚙️ Applications

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

🎯 Benefits

✔ Helps retain compatible oil or grease

✔ Protects bearings and internal components

✔ Oil-resistant NBR sealing material

✔ Suitable for 2.375-inch shaft assemblies

✔ Manufacturer-specific HUMPHREY SYN profile

✔ Good resistance to abrasion and wear

✔ Compact 0.375-inch axial width

✔ Suitable for maintenance and overhaul work

✔ Replacement ready when dimensions and profile match

🧠 Technical Insight

• HUMPHREY SYN Seal Reference
• Inch-Size Rotary Shaft Seal
• NBR Sealing Material
• Manufacturer-Specific SYN Profile
• Radial Shaft-Sealing Function
• Low-Pressure Lubricant Retention
• 60.33 mm Shaft Diameter
• Exact SYN Cross-Section Must Be Verified

✅ Key Features

• HUMPHREY Industrial Quality
• SYN Profile Reference
• Oil-Resistant NBR Material
• Inch-Size Construction
• 2.375x3.375x0.375 Dimensions
• Suitable for Compatible Oil and Grease
• Industrial Replacement Seal
• Cross-Reference Support Available

📊 Specifications

Brand: HUMPHREY

Model / Profile: SYN

Size: 2.375 × 3.375 × 0.375 inch

Metric Equivalent: Approximately 60.33 × 85.73 × 9.53 mm

Type: Industrial Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: SYN

Construction: Manufacturer-Specific HUMPHREY SYN Rotary Shaft-Seal Construction

Lip Design: SYN profile; verify the exact sealing-lip geometry, number of lips, and orientation against the original seal or technical drawing

Dust Lip: Verify from the actual SYN cross-section

Spring Type: Verify from the actual seal construction

Shaft Diameter (ID): 2.375 inches / 60.33 mm

Housing Diameter (OD): 3.375 inches / 85.73 mm

Width: 0.375 inch / 9.53 mm

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

Lubrication: Compatible oil and grease

Temperature Range: Typically approximately -30°C to +100°C for standard NBR; verify the actual compound, lubricant, shaft speed, and operating conditions

Speed Consideration: Permissible speed depends on shaft diameter, surface finish, lubrication, temperature, alignment, runout, lip loading, and NBR compound

Installation Consideration: Confirm shaft finish, housing-bore condition, installation depth, lip direction, concentricity, and protection from sharp shaft edges before fitting

Application Class: Medium Industrial Bearing and Rotating Equipment

Standard: Inch-Size Specialized Industrial Seal

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• HUMPHREY SYN NBR Rotary Shaft Seal
• HUMPHREY 2.375x3.375x0.375 Oil Seal
• 60.33x85.73x9.53 Rotary Seal
• 2.375-Inch Shaft Oil Seal
• Inch-Size NBR Rotary Shaft Seal
• Industrial Bearing Housing Seal
• Industrial Gearbox Shaft Seal
• Industrial Pump Shaft Seal
• OEM SYN Profile Oil Seal
• Industrial NBR Shaft Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original SYN cross-section, sealing-lip geometry, lip orientation, outside-case construction, reinforcement arrangement, spring configuration, installation direction, material compound, and operating requirements.

(Always verify dimensions, SYN-profile geometry, lip direction, shaft finish, housing condition, installation depth, lubricant compatibility, rotational speed, temperature, runout, pressure, and operating conditions before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for gearbox overhaul, bearing-housing maintenance, industrial pump repair, motor servicing, transmission maintenance, 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