DISC SPRING, BELLEVILLE WASHER MATERIAL GRADE: 17-7 PH AMS 5529 Size: OD: 18.009-17.805 MM ID: 6.350-6.198 MM THICKNESS: 0.610-0.635 MM FREE HEIGHT: 1.1993-1.1985 MM QUANTITY: 48000 PCS HEAT TREATMENT: CH900 THE LOAD AT A COMPRESSED DEFLECTION OF .018 IN SHALL BE 85 ± 15 LBS REQUIRED FINISH: AS5272 – Type I 18,0 x 6,2 x 0,6 x 1,2 mm