GB/T 9074.8-1988 Cross recessed small pan head screws and spring washers and flat washers assemblies

GB/T 9074.8-1988 Cross recessed small pan head screws and spring washers and flat washers assemblies GB/T9074.8-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Cross recessed small pan head screw, single coil spring lock washer and plain washer assemblies
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GB 9874.8—88
This standard specifies the cross recessed small pan head screw, spring lock washer and plain washer assemblies with thread specifications of M2.5~M6. Reference standards
GB823 Cross-slot small pan head screws
GB944.1 F-slot screws
GB9074.26 Spring washers for assemblies
GB9074.24 Flat heat rings for assemblies
GB5267
Plating layer of threaded fasteners
GB1237 Marking method for fasteners
GB90 Acceptance inspection, marking and packaging dimensions of fasteners
Dimensions are shown in the following figure and Table 1,
Type of joint of the common rod
Approved by the National Machinery Industry Commission on April 16, 1989, implemented on January 1, 1989
Thread specification d
GB 9074.8a
Made by workers
Note: () The specifications in brackets should not be used as much as possible: ② Climbing nails with nominal length above the dotted line, make full thread 512
Technical conditions
Technical conditions are shown in Table 2.
GB 90T4.8—88
H type GB944.1
GB 9074.26
① Galvanized passivation GB5267
GB8074.24
The pad diagram should be able to rotate freely without falling off
: Except for amax, dnmax and rmln, the rest shall comply with the provisions of GB823. 5 Marking
5.1 The marking method shall comply with the provisions of G81237.
5.2 Marking example:
Nominal length 7=20mm, performance level 4.8, surface zinc-plated passivated cross pan head screw, thread specification d=M5,
Marking of spring washer and flat washer assembly: Screw assembly GB9074.8M5×20
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 National Machinery Industry Commission. This standard is drafted by the Standardization Institute of the National Machinery Industry Commission. 513
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