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International Standard Category: Bolts, screws, studs

GB/T 1228-1991    High strength bolts with large hexagon head for steel structures
钢结构用高强度大六角头螺栓 ;
Category No.:21.060.10 Valid Status:abolished
Issued Organization:CSBTS Issued Date:1991-04-22
Implemented Date:1992-1-1 Abolished Date:2006-11-01
Superseded Standard.:GB/T 1228-2006 High Strength Bolts with Large Hexagon Head for Steel Structures
Superseded Date:2006-11-1
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