DIN9021 Flat Washers 大平垫圈 ThreadM2.5M3M3.5M4M5M6M7M8M10M12M14M16M18M20M24d12.73.23.74.35.36.47.48.410.5131517202226d28911121518222430374450566072s0,80,80,811.21.6222.5333445