GB/T 9074.9-1988 Cross recessed countersunk head screw and conical locking washer assemblies

GB/T 9074.9-1988 Cross recessed countersunk head screw and conical locking washer assembly GB/T9074.9-1988 Standard download decompression password: www.bzxz.net

1 Subject content
National Standard of the People's Republic of China
Croas recessed countersunk head screwand countersunk serrated external toothedlock washer assemblles
UDC 621.882
GB 90T4.9—88
This standard specifies the cross recessed countersunk head screw and countersunk serrated external toothedlock washer assemblles with thread specifications of M3~M. 2 Reference standards
Cross recessed countersunk head screws
GB 819
GB944.1Cross recessed countersunk head screws
GB9074.28Conical locking washers for assembliesGB5267Plating layers of threaded fasteners
GB1237Marking methods for fasteners
GB90Acceptance inspection, marking and packaging of fasteners3 Dimensions
The dimensions are shown in the following figure and Table 1.
Approved by the State Machinery Industry Commission on April 16, 198514
1989-01-01 Implementation
Thread specification d
Note: ()Do not use the specifications in brackets as much as possible. General
GB 9074.9-aRequired
()For screws with a nominal length above the dotted line, make full threads. M5
4 Technical conditions
The technical conditions are shown in Table 2. www.bzxz.net
Other technical requirements
Note: Except for αmx, the rest shall comply with the provisions of GH819. 5 Marking
5.1 The marking method shall comply with the provisions of GH1237.
5.2 Marking examples
GB 9074.9—88
GB 819
H type GB 944.1
①Galvanized GE5267
②Oxidized
GB9074.28
The washer should be able to rotate freely without falling off
Marking of cross recessed countersunk screws and conical lock washers with thread specification d=M5, nominal length l=20mm, performance grade 4.8, and surface zinc-plated passivated:
GB9074.9M5×20
Screw assembly
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 Committee. This standard is drafted by the Standardization Institute of the National Machinery Industry Committee. 516
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