DOP532193003                                        Husqvarna Bolt and Washer Assembly No. 532193003. Blade  Bolt, Washer Assembly No. 193003. This is an original AYP part. This is  the bolt and washer that holds the blade to the spindle. 7/16 x 20  Thread. Replace Husqvarna part numbers 532-19-30-03. 193003, and 532193003.