圓柱頭螺釘用 A級墊圈,硬度最高250HV
Product Grade A, Up To Hardness 250 Hv, Primarily for Cheese Head Screws
圓柱頭螺釘用 A級加硬墊圈,硬度300HV以上
Washers: Product Grade A. From Hardness 300 Hv, Primarily For Cheese Head Screws
A級小平墊,硬度200HV和300HV
Plain Washers - Small Series, Product Grade A, 200HV and 300HV