Standard of Self Drilling Screws
GB/T 15856.1-2002 (DIN EN ISO 15481)
Cross recessed pan head drilling screws with tapping screw thread
GB/T 15856.2-2002 (DIN EN ISO 15482)
Cross recessed countersunk head drilling screws with tapping screw thread
GB/T 15856.3-2002 (DIN EN ISO 15483)
Cross recessed raised countersunk head drilling screws with tapping screw thread
GB/T 15856.4-2002 Hexagon flange drilling screws with tapping screw thread
GB/T 15856.5-2002 (ISO 15480:1999 | DIN EN ISO 15480 | ) Hexagon washer head drilling screws with tapping screw thread