Manufactured by CHG Bearing, the R8 is a precision Inch Miniature Deep Groove Ball Bearings. Key dimensional parameters include a 12.7 mm bore diameter, a 28.575 mm outer diameter, and a 6.35 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.
R8 - Inch Miniature Deep Groove Ball Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | R8 |
| Dimensions | |
| Bore Diameter (d) | 12.7 mm |
| Width (B) | 6.35 mm |
| Outer Diameter (D) | 28.575 mm |
| Open Width B | 6.35 mm |
| Radius rs min | 0.4 mm |
| Flange Df | 31.12 mm |
| Closed Width B1 | 7.938 mm |
| Open Flange Width Bf | 1.575 mm |
| Closed Flange Width Bf1 | 1.575 mm |
| Performance | |
| Dynamic Load Cr (N) | 5108 N |
| Static Load C0r (N) | 2413 N |
| Grease Speed (x1000 rpm) | 27 x1000 rpm |
| Oil Speed (x1000 rpm) | 32 x1000 rpm |
| Design Configurations | |
| Open Model | R8 |
| Flanged Open Model | FR8* |
| Shielded Model | R8ZZ* |
| Flanged Shielded Model | FR8ZZ* |
| 2RS | 2RS |
| 2RU | 2RU |
| TTS | TTS |
| Internal Design & Weight | |
| Cage Type | J |
| Ball Qty. Z | 8 |
| Ball Size Dw | 4.762 mm |
| Shielded Weight (g) | 24.1 g |
| Flanged Shielded Weight (g) | 25.6 g |
| Open Weight (g) | 11.6 g |
| Flanged Open Weight (g) | 13 g |
R8 28.575 mm 12.7 mm 6.35 mm Frequently Asked Questions about R8 Inch Miniature Deep Groove Ball Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Beyond standard alloy steel, CHG Bearing can customize the R8 Inch Miniature Deep Groove Ball Bearings using AISI 440C stainless steel, black oxide coating, zinc-nickel plating, or hybrid ceramic (Si3N4) balls for applications involving chemical exposure, marine salt fog, or galvanic current hazards.
As a primary manufacturer, CHG Bearing supports both trial batch evaluations and container-load supply for R8. Standard catalog sizes are stocked for rapid 3–7 day dispatch, while high-volume OEM production runs typically dispatch within 30–45 days.
Quality starts with raw material selection: CHG Bearing crafts R8 inner and outer rings from high-purity High-Quality Chrome Steel (GCr15/100Cr6). Our raw billets undergo vacuum degassing and secondary ESR (electroslag remelting) processes to drastically eliminate non-metallic sulfide and oxide inclusions, elevating subsurface contact fatigue resistance.
The Open Type engineered for R8 by CHG Bearing utilizes precision non-contact metal shields or reinforced NBR/FKM contact lip seals. This barrier prevents particulate ingress, washdown fluids, and abrasive dust from reaching the raceways while eliminating grease leakage under centrifugal forces.
