... products are: bolts, screws, nuts, machine screws, plain washers, spring lock washe rs, wood screws, tapping screws, drilling screws,chipboard screws ... requirements, in grades 4.8, 6.8, 8.8, 10.9, 12.9, A2-50, A2-70, and A4-70. We are ... about our company, you are welcome to visit us. SPRING LOCK WASHER