Wear part for a bucket to a loading or digging machine, fastening unit therefore and wear part system, bucket and loading or digging machine

Wear part for a bucket to a loading or digging machine, said bucket being provided with at least one front edge plate with a forwardly directed engagement edge, wherein the wear part has a forward direction and a rearward direction and a fastening portion for fixing of the wear part to the bucket, wherein 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, said fastening unit being positionable and tightenable through a hole in said front edge plate, and wherein the spanning surface portion is located in a recess in the fastening portion and extends at a first angle against said forward direction such that, in use, when tightening said fastening unit a force effecting the wear part in the rearward direction will occur, and wherein

• the wear part is provided with means for engagement with said engagement edge, wherein said means for engagement with said engagement edge is a hook portion,
• the hook portion includes an inner hook surface for lying against and for co-operation, in operation, with an obliquely upwards, forwardly directed chamfering on the edge plate, said chamfering and thereby the inner hook portion forming a second angle of 35°-60° to a horizontal plane through the front edge plate, and
• the spanning surface portion extends such that the first angle against said forward direction is 35°-60°.