GB/T 819.2-1997
Countersunk flat head screws with type H cross recess(shallow)
GB/T 819.2-1997
Countersunk flat head screws with type Z cross recess(shallow)
GB/T 820-2000
Cross recessed raised countersunk head screws-type H
GB/T 820-2000
Cross recessed raised countersunk head screws-type Z
GB/T 820-2015
Cross recessed raised countersunk head screws-type H
GB/T 820-2015
Cross recessed raised countersunk head screws-type Z
GB/T 70.1-2000
Hexagon socket head cap screws
GB/T 70.2-2000
Hexagon socket button head screws
GB/T 70.3-2000
Hexagon socket countersunk head screws
GB/T 77-2000
Hexagon socket set screws with flat point
GB/T 77-1985
Hexagon socket set screws with flat point
GB/T 79-2000
Hexagon socket set screws with dog point
GB/T 79-1985
Hexagon socket set screws with dog point
GB/T 78-2000
Hexagon socket set screws with cone point
GB/T 78-1985
Hexagon socket set screws with cone point
GB/T 80-2000
Hexagon socket set screwss with cup point
GB/T 80-1985
Hexagon socket set screwss with cup point
GB/T 821-2018
Square set screws with chamfered end
GB/T 41-2000
Hexagon nuts
GB/T 41-1986
Hexagon nuts
