இலவச பொறியியல் கருவி #074
Keyway Calculator — DIN 6885
Key sizes per DIN 6885 (formerly ISO/R 773, withdrawn). Enter shaft diameter and torque to find the standard key size and run simplified shear and bearing stress checks.
Results
Tangential Force
Shear Stress in Key
Bearing Stress
Standard Key Sizes (DIN 6885)
Key cross-sections below follow DIN 6885. The corresponding ISO recommendation, ISO/R 773, has been withdrawn and is mentioned here for historical reference only; it listed the same sizes but is no longer a current ISO document.
| Shaft d (mm) | Key w×h (mm) |
|---|---|
| 6–8 | 2×2 |
| 8–10 | 3×3 |
| 10–12 | 4×4 |
| 12–17 | 5×5 |
| 17–22 | 6×6 |
| 22–30 | 8×7 |
| 30–38 | 10×8 |
| 38–44 | 12×8 |
| 44–50 | 14×9 |
| 50–58 | 16×10 |
| 58–65 | 18×11 |
| 65–75 | 20×12 |
| 75–85 | 22×14 |
| 85–95 | 25×14 |
Key length = 1–1.5× shaft diameter. Check stress concentrations at keyway corners (Kt=1.5–2.5). The shear and bearing formulas above are simplified engineering checks assuming uniform stress distribution — they are common design practice, not requirements of any current ISO standard.