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Speed & Temp Factor Spec Table
Speed & Temp Factor KS Specifications — 15 sizes
ISO 281
ISOSpeed & Temp Factor
15 sizes| Condition | Bearing Type | Coefficient | Coef. Name | Example Use | Formula |
|---|---|---|---|---|---|
| n = 10 rpm | 1.494 | fn | Ultra | fn=(33.3/n)^(1/3) | |
| n = 50 rpm | 0.874 | fn | () | fn=(33.3/n)^(1/3) | |
| n = 100 rpm | 0.694 | fn | Shaft | fn=(33.3/n)^(1/3) | |
| n = 500 rpm | 0.406 | fn | General | fn=(33.3/n)^(1/3) | |
| n = 1000 rpm | 0.322 | fn | General | fn=(33.3/n)^(1/3) | |
| n = 1500 rpm | 0.282 | fn | General 4 | fn=(33.3/n)^(1/3) | |
| n = 3000 rpm | 0.224 | fn | 2 | fn=(33.3/n)^(1/3) | |
| n = 5000 rpm | 0.189 | fn | Pin | fn=(33.3/n)^(1/3) | |
| n = 10000 rpm | 0.150 | fn | Ultra Pin | fn=(33.3/n)^(1/3) | |
| T ≤ 150°C | - | 1.00 | ft | Standard Heat Treat Bearing | HT |
| T = 175°C | - | 0.95 | ft | S1 Heat Treated | S1 |
| T = 200°C | - | 0.90 | ft | S1 Bearing | S1 |
| T = 250°C | - | 0.75 | ft | S2 | S2 |
| T = 300°C | - | 0.60 | ft | S3 | S3 |
| T = 350°C | - | 0.50 | ft | () |
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
Life correction factors as a function of rotational speed n (rpm) and operating temperature. The speed factor fn = (33.3/n)^(1/3) for ball bearings — higher speed means smaller fn and drastically shorter permissible life for the same load and bearing. The temperature factor ft is 1.0 below 150 °C with standard heat treatment, 0.9 at 200 °C, and below that requires S1/S2-stabilized bearings. In practice, apply fn and ft to the dynamic load rating as Cr_eff = ft·Cr before life calculation.