Weaknesses of Half-Round Keys
The semicircular key is a kind of key, the upper surface is a plane, the lower surface is a semicircular arc surface, the two sides are parallel, commonly known as the crescent key. It is basically the same as the flat key connection, but it is more convenient to manufacture and disassemble than the flat key, and is especially suitable for the connection between the tapered shaft and the hub. The disadvantage is that the strength of the shaft is weakened, and it is generally only used in parts with less force.
Calculation of connection strength of semicircular bonds
As long as the shaft diameter d is known, check the mechanical manual to get all the dimensions of the semicircular key including the nominal length