6904-2RS Sealed Ultra-Thin Deep Groove Ball Bearing for Precision Compact Mechanisms | 20×37×9 Mm
The 6904-2RS is a Double Rubber-Sealed Ultra-Thin Deep Groove Ball Bearing engineered for applications requiring a slender profile along with reliable contamination protection. Fitted with two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while maintaining internal lubrication. With a 20 mm bore and a slim 9 mm width, this bearing offers an ideal solution for compact motors, precision equipment, and small devices where space savings and environmental sealing are essential.
6904-2RS Deep Groove Ball Bearing 20×37×9 mm | 69 Series – Ultra-Thin | Double Rubber Sealed
Built on a space-efficient deep groove geometry, this sealed bearing supports smooth and quiet operation at speeds up to 18,000 r/min (Oil). Designed to carry light to moderate radial loads, the 6904-2RS provides consistent performance and effective sealing where minimal axial space and operational reliability are paramount.

Designed for use across a variety of compact and precision-driven industries:
Featuring a slim 9 mm width, the 6904-2RS achieves an optimal balance between space conservation and functional performance. Its compact form factor supports assembly designs with strict axial space limitations while maintaining adequate load support.
Equipped with two integrated rubber contact seals (2RS), this bearing ensures durable protection against moisture and particulate contamination. This contributes to extended service intervals and reliable operation in humid, dusty, or demanding settings.
Precision-engineered from chrome steel with optimized internal clearances, it delivers consistently quiet running with low vibration, ensuring accurate and refined rotational performance for precision mechanisms.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 69 Series – Extra Thin |
| Basic Designation | 6904 |
| Suffix | 2RS (Double Rubber Contact Seals) |
| Bore Diameter (d) | 20 mm |
| Outer Diameter (D) | 37 mm |
| Width (B) | 9 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Steel Stamped |
| Dynamic Load Rating (Cʳ) | 5.65 kN |
| Static Load Rating (C₀ʳ) | 2.85 kN |
| Limiting Speed (Grease) | 14,000 r/min |
| Limiting Speed (Oil) | 18,000 r/min |
| Weight (approx.) | 32 g |
Common manufacturer equivalents include:
The 6904-2RS is equipped as standard with two rubber contact seals, making it suitable for applications exposed to dust, humidity, or occasional fluid contact. For high-speed operation in clean and dry environments, the double metal-shielded version (6904-ZZ) is available as an alternative configuration.
"A premier choice for space-sensitive applications including small motors, precision instruments, and compact drives, where reliable sealing and a slim, robust design are simultaneously required."
The 698-ZZ is a Durable Miniature Deep Groove Ball Bearing designed for applications that require a robust yet compact bearing solution with built-in contamination resistance. Featuring double steel shields (ZZ), it provides effective two-side sealing against dust and airborne particles while ensuring smooth, low-friction performance. With an 8 mm bore, 19 mm outer diameter, and a 6 mm width, this bearing is well-suited for small industrial motors, geared mechanisms, and electromechanical devices where reliable operation in varied environments is essential.
Details
The 699-2RS is a Double Rubber-Sealed Miniature Deep Groove Ball Bearing designed for compact, high-reliability applications where protection against moisture and fine contaminants is essential. With two rubber contact seals (2RS) on both sides, this bearing provides superior sealing performance, retaining lubrication and preventing ingress of dust, dirt, and fluids. Featuring a 9mm bore and an ultra-light cross-section, it is ideal for sensitive precision instruments, small motors, and devices operating in challenging environments where space is limited and cleanliness is critical.
Details
The 6901-2RS is a Double Rubber-Sealed Ultra-Thin Section Deep Groove Ball Bearing designed for space-sensitive applications requiring reliable sealing and low-profile design. Equipped with two rubber contact seals (2RS), it effectively shields against dust, moisture, and contaminants while retaining grease for extended service. Featuring a 12 mm bore and an exceptionally slim 6 mm width, this bearing is ideal for small motors, precision instruments, and compact mechanisms where axial space is limited.
Details
The 6902-ZZ is a Double Metal-Shielded Ultra-Thin Series Deep Groove Ball Bearing engineered for applications demanding a slim profile, high rotational speeds, and effective dust protection. Featuring two non-contact steel shields (ZZ) on both sides, it guards against dry contaminants while minimizing friction and heat generation. With a 15 mm bore and an exceptionally low 7 mm cross-section, this bearing is perfectly suited for small motors, precision spindles, and space-constrained devices where reliable high-speed performance is essential.
Details
The 6903-2RS is a Double Rubber-Sealed Ultra-Thin Series Deep Groove Ball Bearing designed for applications where space constraints and environmental protection are equally critical. Equipped with two effective rubber contact seals (2RS), it provides reliable defense against dust, moisture, and fine contaminants while retaining lubrication. Featuring a 17 mm bore and a slim 7 mm width, this bearing is an excellent choice for compact motors, precision instruments, and small mechanisms operating in potentially contaminated or humid conditions.
Details
The 6904-2RS is a Double Rubber-Sealed Ultra-Thin Deep Groove Ball Bearing engineered for applications requiring a slender profile along with reliable contamination protection. Fitted with two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while maintaining internal lubrication. With a 20 mm bore and a slim 9 mm width, this bearing offers an ideal solution for compact motors, precision equipment, and small devices where space savings and environmental sealing are essential.
Details
The 6905-2RS is a Double Rubber-Sealed Ultra-Thin Series Deep Groove Ball Bearing designed to deliver reliable performance in space-constrained applications that also require environmental protection. Fitted with two effective rubber contact seals (2RS), it guards against dust, moisture, and contaminants while retaining grease for extended service life. With a 25 mm bore and a slender 9 mm width, this bearing is an excellent choice for compact motors, gearboxes, actuators, and other light industrial or automotive mechanisms operating in potentially harsh conditions.
Details
The 6908-2RS is a Double Rubber-Sealed Extra-Light Series Deep Groove Ball Bearing engineered for applications demanding minimal cross-section with reliable contamination protection. Featuring two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while preserving internal lubrication. With a 40 mm bore and a slim 12 mm width, this bearing is an excellent choice for compact machinery, precision instruments, and light-duty drive systems where sealing integrity and space efficiency are equally important .
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