... head screw.1. standard: AS, or according to our client's requirements.2. size: According to clients3. grade: 4.6, 5 ... bolts as the customer's drawings. >>Our strength on exporting:1.Our company (Suzhou Sudelan Railway Parts Co., Ltd.) is specializing in producing ... being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and Africa and ...