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DIN 6885 Key Size for a 35 mm Shaft
How to select the DIN 6885 parallel-key size for a 35 mm shaft and why length and strength still require engineering checks.
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Select and check a key →Standard size selection is only the first step
DIN 6885-1 provides standardized parallel-key and keyway dimensions by shaft-diameter range. After selecting the standard section, the available key length and the transmitted torque still need to be checked.
Why key length matters
The same shaft and key section can carry different torque depending on the effective key length, allowable contact pressure and allowable shear stress. Hub geometry can also limit the practical length.
Related standards
DraftFit guides are engineering educational content and do not replace the controlled standard, project specification or responsible-engineer review.