Manufactured by CHG Bearing, the R12 is a precision Inch Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 19.05 mm bore diameter, a 41.275 mm outer diameter, and a 7.938 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
R12 - Inch Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | R12 |
| Dimensions | |
| Bore Diameter (d) | 19.05 mm |
| Width (B) | 7.938 mm |
| Outer Diameter (D) | 41.275 mm |
| Open Width B | 7.938 mm |
| Radius rs min | 0.8 mm |
| Closed Width B1 | 11.113 mm |
| Performance | |
| Dynamic Load Cr (N) | 9384 N |
| Static Load C0r (N) | 5057 N |
| Grease Speed (x1000 rpm) | 17 x1000 rpm |
| Oil Speed (x1000 rpm) | 21 x1000 rpm |
| Design Configurations | |
| Open Model | R12 |
| Flanged Open Model | - |
| Shielded Model | R12ZZ* |
| Flanged Shielded Model | - |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | - |
| Internal Design & Weight | |
| Cage Type | RJ, TW |
| Ball Qty. Z | 9 |
| Ball Size Dw | 6.35 mm |
| Shielded Weight (g) | 69.3 g |
| Open Weight (g) | 53.1 g |
R12 41.275 mm 19.05 mm 7.938 mm Frequently Asked Questions about R12 Inch Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
The CHG Bearing R12 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
In its sealed configuration (Open Type), CHG Bearing pre-charges R12 with premium wide-temperature lithium-complex or polyurea grease, calibrated to a 30%–35% cavity volume ratio. For open-type variants, synthetic PAO or refined mineral lubricating oils with appropriate EP (Extreme Pressure) additives should be circulated.
For international ocean and air freight, CHG Bearing packs R12 with industrial VCI anti-corrosion barrier wrapping, sealed polybags, individual cartons, and fumigated ocean-worthy wooden crates. This multi-layer barrier guarantees rust-free storage for a minimum shelf life of 24 to 36 months.
To ensure optimum performance of CHG Bearing R12 Inch Miniature Deep Groove Ball Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 19.05 mm bore. For the 41.275 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
