GB/T 9074.13-1988 Cross recessed hexagonal head bolts and spring washers and flat washers assemblies

GB/T 9074.13-1988 Cross recessed hexagonal head bolts and spring washers and flat washers assemblies GB/T9074.13-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Cross recessed hexagon bolt with lth Indentation, single coil lock washer and plaln washer assemblies1 Subject content
UDC621.8B2
GB 8074.13-18
This standard specifies the cross recessed hexagon bolt with thread specification of M3 to M8, spring washer and plaln washer assemblies. 2 Reference standards
GB29.2 Cross recessed octagonal head bolts
Cross bolts for screws
GB9074.26 Spring washers for assemblies
GB9074.24
Plain washers for assembliesbzxZ.net
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.
is the type of joint
National Machinery Industry Commission approved 526 on April 16, 1988
1988-01-01 implementation
thread specification d
five nominal
H nominal
d, nominal
(test)
Note: @do not use the specifications in brackets as much as possible. GB 9074: 13
controlled by process
②The nominal length of the bolt above the dotted line is made into a full-climbing pattern. 4 Technical provisions
The technical conditions are shown in Table 2.
Surface treatment
Other technical requirements
Acceptance and packaging
GB 9074.13-8
① Plating and purification GB5267
GBB074.26
The pad pattern should be able to rotate freely without falling off
Note, except for amax, damax and rmin, the rest shall comply with the provisions of GB 29.2. 5 Marking
5.1 The marking method shall comply with the provisions of GB 1237.
5.2 Marking example:
GB 9074. 24
Thread specification d=M5, nominal length /=20mm, performance level 5.8, surface zinc-plated passivated cross recessed hexagonal head bolt, spring washer and flat washer assembly marking: Bolt assembly GB 9074. 13 M 5 × 20 Additional instructions,
This standard is proposed by the National Technical Committee for Standardization of Hardware. This standard is under the jurisdiction of the National Machinery Industry Commission Standardization Institute, and this standard is drafted by the National Machinery Industry Commission Standardization Institute. 528
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