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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
中华人民共和国国家标准
UDC 621.882.6
GB 29.1—88
代替GB 29—76
六角头头部带槽螺栓 A和B级
Hexagon bolts with slot on head—Product
A and B
国家机械工业委员会1988-06-24批准 1989-07-01实施
1 主题内容
本标准规定了螺纹规格为M3～M12的六角头头部带槽螺栓。
该螺栓是在GB 5783的头部制出一字槽。
2 引用标准
GB 5783 六角头螺栓—全螺纹—A和B级
GB 1237 紧固件的标记方法
3 尺寸
尺寸如下图及表1所示。
其余的型式与尺寸按GB 5783规定。
表1 mm
螺纹规格d M3 M4 M5 M6 M8 M10 M12
n 公称 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 技术条件
技术条件按GB 5783规定。
5 标记
5.1 标记方法按GB 1237规定。
5.2 标记示例：
螺纹规格d＝Ml2、公称长度l＝80mm、性能等级为8.8级、表面氧化、全螺纹、A级的六角头头部带槽螺栓的标记：
螺栓GB 29.1 M12×80
附加说明：
本标准由全国紧固件标准化技术委员会提出。
本标准由国家机械工业委员会标准化研究所归口。
