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Key sizes per DIN 6885 (formerly ISO/R 773, withdrawn).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.

DIN 6885Stress CheckAuto-Calc
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Results

Standard Key (w × h)
Tangential Force
Shear Stress
Bearing Stress
SF (Shear)
SF (Bearing)

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 The corresponding ISO recommendation, ISO/R 773, has been withdrawn and is mentioned here for historical reference only; it listed the same sizes but is no longer a current ISO document.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)
6–82×2
8–103×3
10–124×4
12–175×5
17–226×6
22–308×7
30–3810×8
38–4412×8
44–5014×9
50–5816×10
58–6518×11
65–7520×12
75–8522×14
85–9525×14

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.

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