How is key size selected?

By shaft diameter per the DIN 6885 standard lookup table (the equivalent ISO/R 773 recommendation is withdrawn).

What stresses are checked?

Shear stress tau=F/(w*L) and bearing stress sigma=F/((h/2)*L).

What key length to use?

1 to 1.5 times shaft diameter. Min is hub length minus chamfers.

What about stress concentration?

Keyway creates Kt=1.5-2.5. Use end-milled keyways for better fatigue life.

Yes at 180 degrees. Assume each carries 75% due to tolerances.

मोफत अभियांत्रिकी साधन #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Key sizes per DIN 6885 (formerly ISO/R 773, withdrawn).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 6885ताण तपासणीस्वयंचलित गणना

Results

मानक की (w × h)

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स्पर्शरेषीय फोर्स

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शीअर ताण

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बेअरिंग ताण

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SF (शीअर)

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SF (बेअरिंग)

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स्पर्शरेषीय फोर्स

कीमधील शीअर ताण

बेअरिंग ताण

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 The corresponding ISO recommendation, ISO/R 773, has been withdrawn and is mentioned here for historical reference only; it listed the same sizes but is no longer a current ISO document.

शाफ्ट d (mm)	की 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

की लांबी = 1–1.5× शाफ्ट व्यास. कीवे कोपऱ्यांवरील ताण एकाग्रता तपासा (K_t=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.