The NICE 1638DS is an inch-series single-row deep groove ball bearing designed to provide low-friction shaft support while handling primarily radial loads together with moderate axial loads in both directions.

Its dimensions are:

Bore Diameter: 3/4 inch / 19.05 mm

Outside Diameter: 2 inches / 50.80 mm

Width: 9/16 inch / approximately 14.29 mm

The DS designation indicates metal shields on both sides of the bearing. These shields help retain factory-applied lubricant inside the bearing while providing protection against dust and relatively coarse contamination without the higher contact friction associated with contact rubber seals.

The bearing is manufactured from 52100 high-carbon chromium alloy bearing steel, a widely used bearing material providing high hardness, wear resistance, fatigue resistance, and dimensional stability for rolling-contact applications.

The deep-groove raceway geometry provides good radial-load capability while also allowing moderate axial loading in either direction under appropriate operating conditions.

Compared with an open bearing, the double-shielded configuration offers improved contamination protection and lubricant retention, making it well suited to industrial equipment where continuous external relubrication may not be convenient.

Before replacement, verify:

• Bore, outside diameter, and width
• Double-shielded DS construction
• Internal clearance
• Cage construction
• Lubrication requirement
• Radial and axial loads
• Shaft and housing fits
• Rotational speed
• Operating temperature
• Existing equipment specification

⚙️ Applications

• Electric motors
• Industrial gearboxes
• Pumps
• Conveyor systems
• Fans and blowers
• Mechanical transmissions
• Agricultural machinery
• Industrial drive systems
• Machine assemblies
• Legacy OEM equipment

🎯 Benefits

✔ Standard inch-size 3/4" × 2" × 9/16" dimensions

✔ Double metal shields on both sides

✔ Helps retain bearing lubricant

✔ Helps reduce entry of dust and dirt

✔ Low-friction deep groove ball-bearing design

✔ Supports radial and moderate axial loads

✔ 52100 high-carbon chromium bearing steel

✔ Suitable for maintenance and overhaul work

✔ Useful for modern replacement of legacy inch-size machinery

🧠 Technical Insight

• NICE 1638DS Bearing Reference
• Single-Row Deep Groove Ball Bearing
• Double-Shielded DS Construction
• 3/4-Inch Bore
• 2-Inch Outside Diameter
• 9/16-Inch Width
• 52100 Chrome Bearing Steel
• Suitable for Radial and Moderate Axial Loads

✅ Key Features

• NICE Industrial Bearing
• Model 1638DS
• Single-Row Construction
• Double Metal Shields
• Inch-Series Dimensions
• Deep Groove Raceway
• Industrial Rotary-Shaft Support
• Cross-Reference Support Available

📊 Specifications

Brand: NICE

Model / Bearing Number: 1638DS

Bearing Series: 1638

Bearing Type: Single-Row Deep Groove Ball Bearing

Configuration: Double-Shielded Radial Ball Bearing

Bore Diameter (d): 3/4 inch / 19.05 mm

Outside Diameter (D): 2 inches / 50.80 mm

Width (B): 9/16 inch / approximately 14.29 mm

Dimensions: 19.05 × 50.80 × 14.29 mm

Rolling Element: Ball

Number of Rows: 1

Raceway Type: Deep Groove

Closure Type: Metal shields on both sides

Suffix: DS – Double-Shielded configuration for this NICE bearing

Bearing Material: 52100 High-Carbon Chromium Alloy Steel

Load Capability: Primarily radial load with moderate axial-load capability in both directions

Contamination Protection: Metal shields help reduce ingress of dust and dirt; not intended to provide the same sealing level as contacting rubber seals

Lubrication: Shields help retain internal lubricant; verify original lubrication specification for the application

Internal Clearance: Verify original bearing or equipment requirement

Cage: Verify actual NICE 1638DS specification where cage material is critical

Speed Consideration: Shielded construction generally supports relatively low-friction operation; permissible speed depends on load, lubrication, fit, temperature, and equipment conditions

Temperature Range: Depends on lubricant, cage, bearing clearance, and actual operating environment

Shaft Fit: Select according to shaft rotation, load conditions, and required interference

Housing Fit: Select according to loading, housing construction, temperature, and operating conditions

Standard: NICE Inch-Series Deep Groove Ball Bearing

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• NICE 1638DS
• 1638DS Double-Shielded Ball Bearing
• 1638-ZZ / 1638-2Z dimensional equivalent where specification matches
• 3/4x2x9/16 Ball Bearing
• 19.05x50.80x14.29 mm Ball Bearing
• 3/4-Inch Bore Deep Groove Bearing
• Double-Shielded Industrial Ball Bearing
• Inch-Series Deep Groove Bearing
• OEM 1638-Series Replacement Bearing
• Industrial Radial Ball Bearing

The dimensions 3/4 × 2 × 9/16 inch (19.05 × 50.80 × 14.29 mm) provide a strong basis for cross-reference, but dimensional similarity alone does not guarantee complete interchangeability.

A replacement should also match the required double-shielded construction, internal clearance, cage, lubrication, load rating, speed capability, precision, shaft fit, housing fit, and operating environment.

In other manufacturers, terminology such as ZZ or 2Z may indicate two metal shields, but suffix conventions are brand-specific and should be confirmed before substitution.

(Always verify the complete NICE 1638DS specification and machine operating requirements before ordering an equivalent bearing.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for electric motors, pumps, gearboxes, conveyors, fans, agricultural machinery, mechanical drives, industrial machinery, and legacy equipment using a 3/4-inch shaft bearing.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification