GB/T 9074.12-1988 Cross recessed hexagonal head bolt and spring washer assembly GB/T9074.12-1988 Standard download decompression password: www.bzxz.net

1 Subject content
National Standard of the People's Republic of China
Cross recessed hexagon bolt withindentatlon and single coll springlock washer assemblles
UDC 621.882
GB9074.12—88
This standard specifies the cross recessed four-hole hexagon bolt and spring washer assemblies with thread specifications of M3 to M8. 2 Reference standards
GB29.2 Cross-shaped hexagonal head bolts with orange recess
GB944.1 Cross recess for screws
GB9074.26 Spring washers for assemblies
GB5267 Electroplating layer of threaded fasteners
GB1237
Marking method of fasteners
GB90 Acceptance inspection, marking and packaging of fasteners 3 Dimensions
The dimensions are shown in the following figure and Table 1.
Type of head-screw joint
Approved by the State Machinery Industry Commission on April 16, 1988 and implemented on January 1, 1989
Condensed grain specifications d
H nominal
d (test)
Note, ① Avoid using the specifications in brackets as much as possible, GB 9074.12-88
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② Bolts with nominal length above the dotted line must have full thread effect. 4 Technical conditions
The technical conditions are shown in Table 2.
Surface treatment
Other technical requirements
Acceptance and packaging
GB 90T4.12--88
H type GB 944.1
① Zinc passivation
Note: Except for amax, damax and rmin, the rest shall comply with the provisions of GB29.2. 5 Marking
6.1 The marking method shall comply with the provisions of GB1237.
2.2 Marking example,
GB 5267
GB 9074.26
The washer should be able to rotate freely without falling off
Thread specification d = M 5, nominal length != 20mm, performance level 5.8, surface galvanized and passivated cross recessed hexagonal head bolt and spring washer assembly marking:
Bolt assembly GB9074.12
M5×20
Additional instructions:
This standard is proposed by the National Technical Committee for Standardization of Fasteners. This standard is under the jurisdiction of the Standardization Institute of the State Machinery Industry Commission. This standard is drafted by the Standardization Institute of the State Machinery Industry Commission. 525
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