You need M3 screws (not M4). We offer this screws: https://www.alphacool.com/shop/luef...-radiatorschraube-m3-x-15-mm-4-stueck?c=20548
But they are only for our own Slim fans. There the screw in the frame is somewhat recessed, therefore 15mm screws are sufficient. For fans whose screws are flush with the top of the frame, you need at least m3x17 screws. Maximum M3x20.
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