A coupling hook (1) forms the end piece of a lower linkof an agricultural tractor. The coupling hook (1) has ahook body (3) with a receptacle (4) for a coupling body(2) . The hook body (3) is provided with a receivingchamber (5) in which a safety catch (6) is held. Thesafety catch (6) can be adjusted between a blockingposition engaging over the coupling body (2) and apulled-back release position. By the coupling body (2)being pressed into the receptacle (4) of the hook body(3), the safety catch (6) can be transferred into anactivation position from which it is automaticallytransferred into the blocking position. In order toincrease the operational safety of the coupling hook,the safety catch (6) is operatively connected to atleast one cam (9) of an adjustable blocking lever (10).Said cam (9) retains the safety catch (6) in theblocking position thereof. This prevents a forceoriginating from the coupling body (2) from being ableto adjust the safety catch (6).
