Enhanced Dust Protection for Servo Motor Systems

The DMHUI AF1904E VBY Oil Seal (33×52×11mm) is designed for servo motor applications where dust protection and sealing stability are essential. Featuring a VBY structure with an integrated dust lip, it helps reduce the entry of external contaminants while maintaining effective oil sealing.

With its 33mm shaft size and 11mm width, this seal offers a balanced combination of compact fit and structural strength for precision equipment.

Key Points

VBY Dust Lip Design
Equipped with a dedicated dust lip to help block external particles, improving protection for internal components.

Optimized for Servo Motor Applications
Designed for FANUC servo motor systems and precision automation equipment.

Enhanced Contamination Resistance
Suitable for environments where dust or debris may affect performance, helping maintain cleaner internal operation.

Durable NBR Rubber Material
Provides reliable resistance to oils and lubricants while maintaining flexibility during rotation.

Precision 33×52×11mm Fit
Manufactured to exact dimensions for proper installation and consistent sealing performance.

Product Info

Product Name: Automated Robotic Arms Oil Seal AF1904E
OEM Part Number: AF1904E
Seal Type: VBY (Dust Lip Design)
Material: Nitrile Rubber (NBR)
Dimensions:
Shaft (ID): 33mm
Bore (OD): 52mm
Width: 11mm
Primary Application: FANUC Servo Motor systems
Package Includes: 1 x VBY Dust Lip Oil Seal (OEM # AF1904E, Size 33mm x 52mm x 11mm)

In servo motor systems, preventing contamination is just as important as maintaining lubrication. DMHUI VBY seals are designed to support both.

Dust-Focused Sealing Structure
The integrated dust lip helps limit the entry of external particles into the system.

Flexible NBR Sealing Edge
Maintains stable contact with the shaft, supporting consistent operation.

Reinforced Width Design
The 11mm thickness provides additional structural stability in operation.

Ideal For Use In
Servo Motors:
FANUC systems and precision drive units
Automation Equipment:
Robotics, CNC machines, and automated production systems
Industrial Machinery:
Applications requiring enhanced dust protection and sealing performance

FAQ

Q: What makes VBY different from TCY or HTCY seals?
A: VBY is typically a dust lip-focused design. While TCY has a balanced primary and secondary lip, VBY often features a more aggressive or larger dust lip that provides enhanced contamination exclusion. This makes VBY seals particularly suitable for environments with heavy dust, chips, or debris, though they may have slightly higher rotational friction.

Q: Is this seal compatible with my FANUC servo motor?
A: Yes, the AF1904E seal is designed as a direct replacement for specific FANUC servo motor systems that call for a 33x52x11mm VBY-type seal. Verify your original seal part number or measure your shaft (33mm), housing bore (52mm), and cavity width (11mm) to confirm. Note that 33mm is an uncommon shaft size — ensure accurate measurement.

Q: How do I install this seal correctly?
A: Clean the shaft and housing bore thoroughly. Apply a thin film of clean grease to the seal lip. Because the seal is 11mm wide, use a flat installation tool or a socket that matches the 52mm outer diameter. Press the seal squarely into the housing bore, applying even pressure to the outer metal case only. The dust lip side (with the larger, visible lip) must face outward toward the external environment.

Q: What fluids is this seal compatible with?
A: The NBR material is compatible with most mineral-based greases and lubricating oils used in FANUC servo motors and robotic gearboxes. Avoid use with brake fluids, phosphate esters, or aggressive synthetic oils without confirming compatibility.

Q: Is this an original FANUC part?
A: No, this is a high-quality aftermarket replacement manufactured by DMHUI to match OEM AF1904E specifications for fit, material, and performance.

Note: This product is an aftermarket replacement component. Always verify the OEM part number and dimensions from your original seal or equipment manual prior to purchase. The 33mm shaft size and 11mm width are critical — double-check measurements before ordering. Proper installation is essential for optimal sealing performance, especially in contaminated environments where the VBY dust lip is relied upon for protection.

Trust in quality, choose DMHUI
DMHUI VBY oil seals provide a practical solution for servo motor systems where contamination control and sealing stability are key.