The CR Oil Seal 3.875x5.690x0.750 CRSHA2 NBR, Part No. 38777 is designed for industrial rotary shaft applications requiring dependable lubricant retention around a 3.875-inch shaft.

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

This product is identified by:

• Brand: CR
• Part Number: 38777
• Profile: CRSHA2
• Material: NBR

The CRSHA2 designation is a manufacturer-specific profile code. The exact sealing-lip geometry, number of sealing elements, auxiliary exclusion feature, outside-case construction, internal reinforcement, spring arrangement, lip orientation, and installation direction should be verified against the original seal, CR 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 offers good resistance to petroleum-based oils, grease, abrasion, and mechanical wear under standard industrial conditions. Compatibility should be verified before use with aggressive chemicals, fuels, high continuous temperatures, ozone-rich environments, or specialized synthetic lubricants.

The inch dimensions convert approximately to:

Shaft diameter: 3.875 inches or 98.43 mm

Housing diameter: 5.690 inches or 144.53 mm

Seal width: 0.750 inch or 19.05 mm

The 3.875 × 5.690 × 0.750-inch configuration provides a relatively wide seal section suitable for heavy industrial bearing housings, gearboxes, pumps, transmissions, and legacy equipment using an inch-size sealing arrangement. The exact CRSHA2 cross-section and installation depth must be confirmed before replacement.

⚙️ Applications

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

🎯 Benefits

✔ Helps retain compatible oil or grease

✔ Protects bearings and internal components

✔ Oil-resistant NBR sealing material

✔ Suitable for 3.875-inch shaft assemblies

✔ Identified by CR Part No. 38777

✔ Wide 0.750-inch industrial seal construction

✔ Good resistance to wear and abrasion

✔ Suitable for maintenance and overhaul work

✔ Replacement ready when dimensions and profile match

🧠 Technical Insight

• CR Part Number 38777
• Manufacturer-Specific CRSHA2 Profile
• Heavy-Duty Inch-Size Rotary Shaft Seal
• NBR Sealing Material
• Wide 19.05 mm Seal Section
• Low-Pressure Lubricant Retention
• Approximately 98.43 mm Shaft Diameter
• Exact CRSHA2 Cross-Section Must Be Verified

✅ Key Features

• CR Industrial Quality
• Part No. 38777
• CRSHA2 Profile Reference
• Oil-Resistant NBR Material
• Inch-Size Construction
• 3.875x5.690x0.750 Dimensions
• Heavy-Duty Industrial Replacement Seal
• Cross-Reference Support Available

📊 Specifications

Brand: CR

Part Number: 38777

Model / Profile: CRSHA2

Size: 3.875 × 5.690 × 0.750 inch

Metric Equivalent: Approximately 98.43 × 144.53 × 19.05 mm

Type: Heavy-Duty Industrial Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Construction: Manufacturer-Specific CRSHA2 Rotary Shaft-Seal Construction

Lip Design: CRSHA2 profile; verify the exact geometry against the original seal or technical drawing

Dust Lip: Verify from the actual CRSHA2 cross-section

Spring Type: Verify from the actual seal construction

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

Housing Diameter (OD): 5.690 inches / approximately 144.53 mm

Width: 0.750 inch / 19.05 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, rotational speed, and operating conditions

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

Application Class: Heavy Industrial Bearing and Rotating Equipment

Standard: Inch-Size Specialized Industrial Seal

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• CR Part No. 38777 Oil Seal
• CR 3.875x5.690x0.750 Oil Seal
• CR CRSHA2 NBR Shaft Seal
• 98.43x144.53x19.05 Rotary Seal
• 3.875-Inch Shaft Oil Seal
• Inch-Size NBR Rotary Shaft Seal
• Heavy-Duty Bearing Housing Seal
• Industrial Gearbox Shaft Seal
• Industrial Pump Shaft Seal
• OEM CRSHA2 Rotary Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original CRSHA2 cross-section, sealing-lip geometry, lip orientation, outside-case construction, reinforcement arrangement, spring configuration, installation direction, material compound, and operating requirements.

(Always verify Part No. 38777, dimensions, CRSHA2-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 heavy gearbox overhaul, bearing-housing maintenance, industrial pump repair, transmission servicing, 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