... do according to client's Railway carbon steel point ending a307 hex bolts Details of the product ... . Material: Q235, 45#, etc.3. Grade: 4.6, 5.6, 8.8, etc.4. Standard: UIC,DIN,AS, ... with oil, Black, Electro-galvanization, Dacromet and so on. )6. Certificate: ISO9001:2008,SGS7. pakaging: gunny bag , wooden ... and square head bolt by clients.A307 hex point ending screwASTM A307 hex bolts Hex head screws4. ...