2pcs 6806/28 28427-2RS Ball Bearing 28x42x7mm Rubber Sealed
2pcs 6806/28 28427-2RS Ball Bearing 28x42x7mm Rubber Sealed
Details
6806/28 28427-2RS Rubber Sealed Miniature Deep Groove Ball Bearing – 28×42×7mm (Pack of 2)
Upgrade your machinery with this precision-engineered 6806/28 / 28427-2RS miniature ball bearing. Featuring double-sided rubber contact seals (2RS), this thin-wall deep groove ball bearing delivers smooth, stable rotation while keeping dust and moisture out — making it ideal for demanding environments where reliability counts. You receive 2 bearings per order.
Made in Mainland China.
Full Specifications
| Specification | Details |
|---|---|
| Model Number | 618/28 / 6806/28 / 28427-2RS |
| Type | Single Row Thin-Wall Deep Groove Ball Bearing |
| Seal Type | 2RS – Double-Sided Rubber Contact Seals |
| Bore Diameter (d) | 28 mm |
| Outer Diameter (D) | 42 mm |
| Width (B) | 7 mm |
| Material | GCr15 High-Carbon Chromium Bearing Steel |
| Precision Grade | ABEC-3 |
| Internal Clearance | CN (Normal Clearance) |
| Quantity | 2 Pieces |
Key Features
- Double-Sided 2RS Rubber Seals — Effectively block dust, debris, and moisture for maintenance-free operation in harsh environments.
- Thin-Wall Compact Design — Light and space-saving, perfect for applications with tight dimensional requirements.
- Low Friction & High Precision — GCr15 bearing steel with ABEC-3 precision grade ensures stable, smooth, and consistent rotation.
- Pre-Lubricated — Grease-packed at the factory for immediate use right out of the box; no additional lubrication needed.
- Long Service Life — High-quality steel construction resists wear and fatigue under continuous use.
Applications
- Bicycle bottom bracket & wheel hubs
- Small electric motors and precision instruments
- Miniature mechanical equipment
- Fitness equipment and exercise machines
- Robotics and automation components
- 3D printers and CNC machinery
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Frequently Asked Questions
Q: What does the "2RS" designation mean on a 28427-2RS bearing?
A: "2RS" stands for double-sided rubber contact seals. Both sides of the bearing are fitted with rubber seals that make direct contact with the inner ring, providing excellent protection against dust and moisture ingress. This makes the bearing maintenance-free since the internal grease is retained and contaminants are kept out.
Q: Is the 6806/28 (28427-2RS) bearing compatible with bicycle bottom brackets?
A: Yes. With a 28mm bore, 42mm outer diameter, and 7mm width, this bearing is a common fit for bicycle bottom brackets and hubs. Always verify your component's specific dimensional requirements before installation to ensure a proper fit.
Q: How many bearings are included in this listing?
A: This listing includes a pack of 2 bearings (2pcs), making it a convenient and cost-effective way to replace both sides of a component at the same time.
Q: What material are these bearings made from?
A: These bearings are manufactured from GCr15 high-carbon chromium bearing steel, a premium material widely used in precision bearing production for its excellent hardness, wear resistance, and fatigue strength.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.