20 GB/T 32.1-1988 六角头头部带孔螺栓 A和B级 Hexagon bolts with wire holes on head--Product grade A and B 21 GB/T 32.2-1988 六角头头部带孔螺栓 细杆 B级 Hexagon bolts with wire holes on head--Reduced shank--Product grade B
22 GB/T 32.3-1988 六角头头部带孔螺栓 细牙 A和B级 Hexagon bolts with wire holes on head--Fine pitch thread--Product grade A and B
23 GB/T 35-1988 小方头螺栓 B级 Square head bolts with small head--Product grade B
24 GB/T 37-1988 T型槽用螺栓 Bolts for T-Slot
25 GB/T 38-1976 螺栓 技术条件 Bolts--Technical requirements
26 GB/T 39-1988 方螺母 C级 Square nuts--Product grade C
27 GB/T 41-1986 1 型六角螺母 C 级 Hexagon nuts--Style 1--Product grad C
28 GB/T 56-1988 六角厚螺母 Hexagon thick nuts
29 GB/T 61-1976 螺母 技术条件 Nuts--Technical requirements
30 GB/T 62-1988 蝶形螺母 Wing nuts
31 GB/T 63-1988 环形螺母 Lifting nuts
32 GB/T 65-1985 开槽圆柱头螺钉 Slotted cheese head screws
33 GB/T 67-1985 开槽盘头螺钉 Slotted pan head screws
34 GB/T 68-1985 开槽沉头螺钉 Slotted countersunk head screws
35 GB/T 69-1985 开槽半沉头螺钉 Slotted raised countersunk head screws
36 GB/T 70-1985 内六角圆柱头螺钉 Hexagon socket cap head screws
37 GB/T 71-1985 开槽锥端紧定螺钉 Slotted set screws with cone point
38 GB/T 72-1988 开槽锥端定位螺钉 Slotted set screws with cone point
39 GB/T 73-1985 开槽平端紧定螺钉 Slotted set screws with flat point
40 GB/T 74-1985 开槽凹端紧定螺钉 Slotted set screws with cup point
41 GB/T 75-1985 开槽长圆柱端紧定螺钉 Slotted set screws withlong dog point
42 GB/T 77-1985 内六角平端紧定螺钉 Hexagon socket set screws with flat point