GB/T 5281-1985 Hexagon socket head shoulder screws

GB/T 5281-1985 Hexagon socket head shoulder screws GB/T5281-1985 standard download decompression password: www.bzxz.net

1 Introduction
National Standard of the People's Republic of China
Hexagon socket head shoulder screws
Hexagon socket head shoulder screws UDC 621.882.215
GB 5281-B5
This standard specifies "hexagon socket head cylindrical head shaft screws with nominal shaft size of 6.5~25mm㎡ (thread specification of M5~M20). This standard is equivalent to the international standard ISO7379--1983 "hexagon socket head shoulder screws". 2 Reference standards
GB3106-82 "Nominal length of bolts, screws and studs and thread length of ordinary bolts"; GB196-81 "Basic dimensions of ordinary threads" GB197-81 "Tolerances and fits of ordinary threads": GB3098.182 "Mechanical properties of fasteners bolts, screws and studs"; GB31'3.1-82 "Fastener tolerances bolts, screws and nuts", GB5267-85 "Electroplating layer of threaded fasteners": GB 90B5 "Fastener acceptance inspection, marking and packaging". 3 Dimensions (as specified in Figure 1 and Table 1)
Published by the National Bureau of Standards on August 1, 1985
1986 - 06 -01 Implementation
Round or flat
GB5281—85
Axis control edge angle:
When dK10mm, 0.15mml
When d>10mm, 0.20mm
Can be smooth or knurled
Optional head-stem joint type
Allow side separation or
made ​​hole
Optional internal six-stage hole type
Note: ①—pitch.
②·Smooth head.
GB5281—85
③*Knurled head
④ It is allowed to select the intermediate length specification according to GB3106-82. 10
General-
4 Geometric tolerance (according to Figure 2, Table 2 and Table 3) Ooo
Basic dimension dk
Tolerance value
Basic dimension d,
Tolerance value
GB5281-85
Rear axiality and verticality tolerance
Basic dimension 4
Tolerance value
Table 3 True line tolerance
Basic dimension d,
Tolerance value
Basic dimension d
0.002/ + 0.05
0. 0025/ + 0. 05
Tolerance value
5Technical parts (as specified in Table 4)
Mechanical properties
Surface treatment
Product grade
Other parts
Acceptance and packaging
GB6281-85
GB 196—81, GB 197—81
GB3098.1—82
GB 3103.1—82
Surface degree Ra=n.um, applicable to ①Oxidation before electroplating
②Galvanizing
GB5267 --5
GB 9—85bzxz.net
.Note: * Due to structural reasons, this type of screw cannot withstand the tensile test, but the other performance requirements of GB3098.1-82 for Class 12.9 should be met.
Marking example of hexagon socket head shoulder screw with shoulder diameter d, = 10mm (thread specification d = M8), nominal length / = 40mm, and surface oxidation:
Screw GB5281—85-10×40
Additional instructions;
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and was drafted by the Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted at the expense of the Standardization Research Institute of the Ministry of Machinery Industry.
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