GB/T 9074.7-1988 Cross recessed small pan head screw and spring washer assemblies

GB/T 9074.7-1988 Cross recessed small pan head screw and spring washer assembly GB/T9074.7-1988 standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Cross recessed snall pan head screwand siagle coll spring lock washer assenbllesUDC 621.882
GB 9074.7—88
This standard specifies the cross recessed snall pan head screw and siagle coll spring lock washer assemblies with thread specifications of M2.5 to M6. Cited standards
GB823 Cross recessed small pan head screws
GB944.1 Cross recessed slot for screws
GB9074.26 Spring washers for assemblies
GB5267 Electroplating layer of threaded fasteners
GB1237
Marking method of fasteners
Fastener acceptance inspection, marking and packaging
8 Dimensions
The dimensions are shown in the following figure and Table 1.
Type of the joint of the solid rod
Approved by the State Machinery Industry Commission on April 16, 1988508
Implementation on January 1, 1989
Thread specification d
(reference)
GB8174.7$8
[Technical control
Note: ①Do not use the specifications in brackets as much as possible. ②For screws with a nominal length above the dotted line, make full instant threads. 4 Technical conditions
The technical conditions are shown in Table 2.
Controlled by process
Surface treatment
Other technical requirements
Acceptance and transfer
GB 9074.7-88
H type GB 944.1
(i) Galvanized passivation GB5267
The washers should be able to rotate freely without falling off
Note: Except for amax, damax and rmin, the rest shall comply with the provisions of GB823. 5 Marking
5.1 The marking method shall comply with the provisions of GB1237.
5.2 Marking example:
GB9074.26
Thread specification d=M5, nominal length! =20mm, performance level 4.8, surface zinc-plated passivated cross-shaped small pan head screw and spring ring assembly marking:
Screw assembly G9074.7
M 5×20
Additional instructions:
This standard is proposed by the National Fastener Standardization Technical Committee. This standard is under the jurisdiction of the National Machinery Industry Commission Standardization Institute. This standard was drafted by the National Machinery Industry Commission Standardization Institute. 510
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