Coupling hook

Coupling hook (5), especially for a lower connecting rod of a three-point linkage device of a tractor, comprises a hook body (7) with a support element (13) that traverses an outlet opening (11) and divides it into a first opening region (14) and a second opening region (15), a detent pawl (17), and an opening lever (26). The opening lever has a locking catch (28) that fixes the opening lever in the holding position so that in the second opening region it is held between the support element and an opposite-lying limiting edge of the second opening region and prevents the opening lever from pivoting back out of the holding position.