5pcs Miniature Deep Groove Ball Bearings 684–689 2RS Sealed Steel
5pcs Miniature Deep Groove Ball Bearings 684–689 2RS Sealed Steel
Details
JARBLUE Miniature Deep Groove Ball Bearings — 5-Pack (684 to 689 2RS)
Upgrade your builds with these precision-grade rubber-sealed miniature deep groove ball bearings from JARBLUE. Crafted from high-quality GCr15 bearing steel, this 5-piece set covers six popular sizes — making it ideal for hobbyists, engineers, and makers who need reliable rotational performance in compact assemblies. The double rubber seal (2RS) keeps grease in and contaminants out for long-lasting, low-maintenance operation.
Key Features
- Material: GCr15 Bearing Steel — high hardness, excellent wear resistance
- Double Rubber Seal (2RS): Retains lubrication and shields against dust, debris, and moisture
- Smooth, Low-Friction Rotation: Precision ball raceway for consistent, quiet performance
- Versatile Size Range: Six standard miniature sizes in one convenient pack
- Quantity: 5 pieces per pack
- Customizable: Available in custom configurations
Size Specifications
| Model | Dimensions (ID × OD × Width) |
|---|---|
| 684-2RS | 4 × 9 × 4 mm |
| 685-2RS | 5 × 11 × 5 mm |
| 686-2RS | 6 × 13 × 5 mm |
| 687-2RS | 7 × 14 × 5 mm |
| 688-2RS | 8 × 16 × 5 mm |
| 689-2RS | 9 × 17 × 5 mm |
Common Applications
- RC cars, drones, and remote-controlled hobby models
- 3D printers and CNC machines
- Fidget spinners and desk gadgets
- Power tools, motors, and small machinery
- Robotics and DIY mechanical projects
- Skateboards and inline skates
Made in Mainland China.
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Frequently Asked Questions
Q: What does "2RS" mean in the bearing model number?
A: "2RS" stands for Double Rubber Sealed — meaning both sides of the bearing are fitted with rubber seals. This keeps the internal grease lubrication intact and prevents dust, dirt, and moisture from entering the bearing, resulting in longer service life and quieter operation.
Q: Are these miniature bearings suitable for 3D printers and RC models?
A: Yes! The 684-2RS through 689-2RS size range is extremely popular in 3D printers, RC cars, drones, and hobby robotics. Their compact dimensions and smooth rotation make them a go-to choice for small-scale mechanical assemblies that demand precision.
Q: What material are these bearings made from?
A: These bearings are manufactured from GCr15 bearing steel — a chromium-alloy steel known for its high hardness, excellent fatigue resistance, and superior wear characteristics. This makes them durable and reliable across a wide range of applications and speeds.
Q: How many bearings are included in one pack?
A: Each pack contains 5 pieces. You can select the specific size (model number) that fits your application from the available options: 684-2RS, 685-2RS, 686-2RS, 687-2RS, 688-2RS, or 689-2RS.
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.