GB/T 9074.2-1988 Cross recessed pan head screw and external serrated lock washer assembly GB/T9074.2-1988 Standard download decompression password: www.bzxz.net

Subject content
National Standard of the People's Republic of China
Cross recessed Pan head screw and serrated lock washer external teeth assenbliesUDC
GB 9074.2—8Www.bzxZ.net
This standard specifies the cross recessed Pan head screw and external copper teeth lock washer assemblies with thread specifications of M3 to M6. 2 Reference standards
GB818 Cross recessed Pan head screw
GB944.1 Cross recess for screws
GB9074.27 External serrated lock washers for assembliesGB5267 Electroplating of threaded fasteners
GB1237 Marking method for fasteners
GB90 Acceptance inspection, marking and packaging of fasteners 3 Dimensions
The dimensions are shown in the following figure and Table 1.
Types of various parts of the head rod station
National Machinery Industry Commission 1188-04-18 approved 1985-01-01 actual
Specifications 4
To: ① Avoid using the specifications in brackets as much as possible. M3
GB 9074.2-88
Process control
② Screws with nominal length above the dotted line are made into full threads. 4 Technical conditions
Technical conditions are shown in Table 2.
Cross slot
Surface treatment
Other technical requirements
Acceptance and packaging
GB 818
H type GB944.1
(）Zinc passivation
②Oxidation
Note: Except for amax, dam and rmi, the rest shall be in accordance with the provisions of GB818. 494
GB5267
These rings should be able to rotate without falling off
GB 9074.27
5 Marking
5.1 The marking method shall be in accordance with the provisions of GB1237,
GB 9074. 2-8
Marking example:
Thread specification d = M6, nominal length ! = 20mm, performance level 4.8, surface zinc-plated passivated cross recessed pan head screw and external serrated lock washer assembly
M6×20
Screw assembly GB9074.2
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. 495
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