Locknut with flange M5 8 Z - 5927513-01Spare part from the Husqvarna spare parts catalogFits, among others: Husqvarna 322HD60 Husqvarna 522HD60S Husqvarna 522HD60X Husqvarna 522HDR60S Husqvarna 522HDR60X Husqvarna 522HDR75S Husqvarna 522HDR75X Husqvarna 525HE3 Husqvarna 525HE4 Husqvarna 522iHD60