A wear part for a bucket to a loading or digging machine, which bucket has at least one front edge plate with a forwardly directed engagement edge, and the wear part has a forward direction and a rearward direction and is provided with a hook portion for fixing of the wear part to the bucket, and the fastening portion has a spanning surface portion for co-operating in a contact surface area with a clamping surface portion on a fastening unit which is positionable through a hole in the front edge plate. The spanning surface portion extends at an angle against the forward direction such that, in use, when tightening the fastening unit, a force effecting the wear part in the rearward direction will occur. A fastening unit for the wear part and a wear part system, a bucket and a loading or digging machine are also provided.
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