Ad
Reliability Factor Spec Table
Reliability Factor KS Specifications — 10 sizes
ISO 281
ISOReliability Factor
10 sizes| Reliability | Life Name | a₁ Factor | Application | Standard | - |
|---|---|---|---|---|---|
| 90% | L₁₀ () | 1.00 | ISO 281 | ISO 281 | - |
| 95% | L₅ | 0.64 | Precision Machine· | ISO 281 | - |
| 96% | L₄ | 0.55 | Aerospace· | ISO 281 | - |
| 97% | L₃ | 0.47 | Shaft | ISO 281 | - |
| 98% | L₂ | 0.37 | Medical Device· | ISO 281 | - |
| 99% | L₁ | 0.25 | · | ISO 281 | - |
| 99.2% | L₀.₈ | 0.22 | · | ISO 281 | - |
| 99.5% | L₀.₅ | 0.19 | · | ISO 281 | - |
| 99.9% | L₀.₁ | 0.093 | · | ISO 281 | - |
| 99.95% | L₀.₀₅ | 0.077 | · | ISO 281 | - |
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-adjustment factor a₁ for reliabilities above the standard 90% (ISO 281). The nominal L₁₀ corresponds to 90% reliability (10% failure probability); a₁ = 0.64 for 95% reliability (L₅) and 0.25 for 99% reliability (L₁). Higher reliability comes at the cost of guaranteed life — only ~25% of the L₁₀ nominal is assured at L₁. Typical applications: L₁₀ for general machinery, L₅ for automotive and precision, L₁–L₀.₁ for medical and aerospace. Design life is calculated as a₁·L₁₀.