Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
1 Subject content
This standard specifies the hexagon bolts with slot on head with the thread specification of M3 to M12.
The bolt is made to straight grooves in the head according to GB 5783.
2 Normative references
GB 5783 Hexagon head bolts - Full thread - Product A and B
GB 1237 Designation system for fasteners
3 Dimensions
The dimensions are shown in the following figure and Table 1.
Other types and dimensions shall meet the requirements of GB 5783.
Table 1 mm
Thread specification d M3 M4 M5 M6 M8 M10 M12
n Nom. 0.8 1.2 1.2 1.6 2 2.5 3
min 0.86 1.26 1.28 1.66 2.06 2.56 3.06
max 1 1.51 1.51 1.91 2.31 2.81 3.31
t min 0.7 1 1.2 1.4 1.9 2.4 3
4 Technical conditions
The technical conditions shall meet the requirements of GB 5783.
5 Designation
5.1 The designation method shall meet the requirements of GB 1237.
5.2 Example of designation:
The hexagon bolt with slot on head with the thread specification d = M12, nominal length l = 80 mm, property class of 8.8, subjected to surface oxidation, with full thread and Product A is designated as:
Bolt GB 29.1 M12 × 80
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
1 Subject content
This standard specifies the hexagon bolts with slot on head with the thread specification of M3 to M12.
The bolt is made to straight grooves in the head according to GB 5783.
2 Normative references
GB 5783 Hexagon head bolts - Full thread - Product A and B
GB 1237 Designation system for fasteners
3 Dimensions
The dimensions are shown in the following figure and Table 1.
Other types and dimensions shall meet the requirements of GB 5783.
Table 1 mm
Thread specification d M3 M4 M5 M6 M8 M10 M12
n Nom. 0.8 1.2 1.2 1.6 2 2.5 3
min 0.86 1.26 1.28 1.66 2.06 2.56 3.06
max 1 1.51 1.51 1.91 2.31 2.81 3.31
t min 0.7 1 1.2 1.4 1.9 2.4 3
4 Technical conditions
The technical conditions shall meet the requirements of GB 5783.
5 Designation
5.1 The designation method shall meet the requirements of GB 1237.
5.2 Example of designation:
The hexagon bolt with slot on head with the thread specification d = M12, nominal length l = 80 mm, property class of 8.8, subjected to surface oxidation, with full thread and Product A is designated as:
Bolt GB 29.1 M12 × 80
