Get the standardized parallel-key section b × h, the shaft and hub keyway depths and the keyway-width tolerance zones for a given shaft diameter to DIN 6885-1. The keyway fit (normal, tight or sliding) is selectable, and the start of the standard designation is returned as well.
Set the inputs and run the calculation.
Select width, height and keyway dimensions from the standardized key series.
Shaft diameter and key form select the table row; length and material are separate strength inputs.
The standard size depends on shaft diameter because tangential force rises as diameter falls. Keyway depth and form affect both shaft weakening and the actual bearing height.
DIN 6885-1 assigns standard b×h sections and keyway depths to diameter ranges. Geometry alone does not prove torque capacity.
A larger shaft diameter selects a larger standard key width and height.
Sources and limits: DIN 6885-1; perform the strength check to DIN 6892 and check hub geometry.
Select width, height and keyway dimensions from the standardized key series.
Mechanical calculators translate geometry and load into a response such as torque, stress, deflection, spring force or bearing life. The position of the load relative to the effective axis is often decisive.
DIN 6885-1 assigns standard b×h sections and keyway depths to diameter ranges. Geometry alone does not prove torque capacity.
Shaft diameter and key form select the table row; length and material are separate strength inputs. The standard size depends on shaft diameter because tangential force rises as diameter falls. Keyway depth and form affect both shaft weakening and the actual bearing height.
Select shaft diameter and key form (A, B or AB). The calculator returns the standardized width, height and keyway depth values per DIN 6885-1.
A larger shaft diameter selects a larger standard key width and height.
The standard size depends on shaft diameter because tangential force rises as diameter falls. Keyway depth and form affect both shaft weakening and the actual bearing height. The result shows the idealized component response for the selected load case. A small change in diameter, height, length or load can have a large effect because of power laws.
All dimensions in millimetres.
Looking up standardized key dimensions for drawings and procurement, before performing the actual strength check.
DIN 6885-1; perform the strength check to DIN 6892 and check hub geometry.
Common mistake: This geometry alone says nothing about load capacity – it only sets the standard dimensions. Whether the joint can transmit a given torque additionally requires the DIN 6892 strength check.
Form A has rounded ends on both sides, form B square ends on both sides, form AB one rounded and one square end; form affects the bearing length credited in the strength check.
DIN 6885-1 assigns a fixed b×h cross-section to each shaft-diameter range, proven in practice for that shaft size.
No, it is the geometric starting point; actual load capacity additionally depends on torque, material and effective length and is verified separately per DIN 6892.
The standardized geometry is the starting point for the existing parallel-key capacity verification.
Length, form, material, and load capacity must still be selected or verified to DIN 6892.