Precision coupling

A precision coupling for securing a component to an apparatus, the precision coupling comprising:

• a first coupling half having a pivot axle and a clamping lever configured for pivoting about the pivot axle, the clamping lever having at least one lateral flap with a first inclined tightening face, a lateral contour and a resiliently loaded fixing pin configured to slide along the lateral contour when the clamping lever is activated;
• and
• a second coupling half having at least one locking finger with a second inclined tightening face so that when the clamping lever is pivoted and the first coupling half and the second coupling half are placed against each other in an open position, the at least one lateral flap engages behind the at least one locking finger and the first inclined tightening face slides along the second inclined tightening face and to thereby pull the first coupling half and the second coupling half against each other in order to assume a locking position,
• wherein the lateral contour has a curve which radially declines in a direction towards the locking position.