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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.
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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
中華人民共和國(guó)國(guó)家標(biāo)準(zhǔn)
UDC 621.882.6
GB 29.1—88
代替GB 29—76
六角頭頭部帶槽螺栓 A和B級(jí)
Hexagon bolts with slot on head—Product
A and B
國(guó)家機(jī)械工業(yè)委員會(huì)1988-06-24批準(zhǔn) 1989-07-01實(shí)施
1 主題內(nèi)容
本標(biāo)準(zhǔn)規(guī)定了螺紋規(guī)格為M3～M12的六角頭頭部帶槽螺栓。
該螺栓是在GB 5783的頭部制出一字槽。
2 引用標(biāo)準(zhǔn)
GB 5783 六角頭螺栓—全螺紋—A和B級(jí)
GB 1237 緊固件的標(biāo)記方法
3 尺寸
尺寸如下圖及表1所示。
其余的型式與尺寸按GB 5783規(guī)定。
表1 mm
螺紋規(guī)格d M3 M4 M5 M6 M8 M10 M12
n 公稱 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 技術(shù)條件
技術(shù)條件按GB 5783規(guī)定。
5 標(biāo)記
5.1 標(biāo)記方法按GB 1237規(guī)定。
5.2 標(biāo)記示例：
螺紋規(guī)格d＝Ml2、公稱長(zhǎng)度l＝80mm、性能等級(jí)為8.8級(jí)、表面氧化、全螺紋、A級(jí)的六角頭頭部帶槽螺栓的標(biāo)記：
螺栓GB 29.1 M12×80
附加說(shuō)明：
本標(biāo)準(zhǔn)由全國(guó)緊固件標(biāo)準(zhǔn)化技術(shù)委員會(huì)提出。
本標(biāo)準(zhǔn)由國(guó)家機(jī)械工業(yè)委員會(huì)標(biāo)準(zhǔn)化研究所歸口。
