The CR Oil Seal 3.188x4.249x0.438 CRWH1 NBR, Part No. 31758 is designed for industrial rotary shaft applications requiring dependable lubricant retention around a 3.188-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: 31758
• Profile: CRWH1
• Material: NBR

The CRWH1 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: 3.188 inches or 80.98 mm

Housing diameter: 4.249 inches or 107.92 mm

Seal width: 0.438 inch or 11.13 mm

The 3.188 × 4.249 × 0.438-inch configuration is suitable for medium-size bearing housings, industrial gearboxes, pumps, transmissions, conveyor drives, and legacy equipment using an inch-size shaft-sealing arrangement.

⚙️ Applications

• Industrial gearboxes
• 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 3.188-inch shaft assemblies

✔ Identified by CR Part No. 31758

✔ Manufacturer-specific CRWH1 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 31758
• Manufacturer-Specific CRWH1 Profile
• Inch-Size Rotary Shaft Seal
• NBR Sealing Material
• Radial Shaft-Sealing Function
• Low-Pressure Lubricant Retention
• Approximately 80.98 mm Shaft Diameter
• Exact CRWH1 Cross-Section Must Be Verified

✅ Key Features

• CR Industrial Quality
• Part No. 31758
• CRWH1 Profile Reference
• Oil-Resistant NBR Material
• Inch-Size Construction
• 3.188x4.249x0.438 Dimensions
• Industrial Replacement Seal
• Cross-Reference Support Available

📊 Specifications

Brand: CR

Part Number: 31758

Model / Profile: CRWH1

Size: 3.188 × 4.249 × 0.438 inch

Metric Equivalent: Approximately 80.98 × 107.92 × 11.13 mm

Type: Industrial Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Construction: Manufacturer-Specific CRWH1 Rotary Shaft-Seal Construction

Lip Design: CRWH1 profile; verify the exact geometry against the original seal or technical drawing

Dust Lip: Verify from the actual CRWH1 cross-section

Spring Type: Verify from the actual seal construction

Shaft Diameter (ID): 3.188 inches / approximately 80.98 mm

Housing Diameter (OD): 4.249 inches / approximately 107.92 mm

Width: 0.438 inch / approximately 11.13 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: Industrial Bearing and Rotating Equipment

Standard: Inch-Size Specialized Industrial Seal

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• CR Part No. 31758 Oil Seal
• CR 3.188x4.249x0.438 Oil Seal
• CR CRWH1 NBR Shaft Seal
• 80.98x107.92x11.13 Rotary Seal
• 3.188-Inch Shaft Oil Seal
• Inch-Size NBR Rotary Shaft Seal
• Industrial Bearing Housing Seal
• Industrial Gearbox Shaft Seal
• Industrial Pump Shaft Seal
• OEM CRWH1 Rotary Seal

The same dimensions alone do not guarantee interchangeability. The replacement must match the original CRWH1 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. 31758, dimensions, CRWH1-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, 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