GB/T 5277-1985 Fasteners - Through holes for bolts and screws

This standard specifies the dimensions of through holes for bolts and screws with thread specifications of M1 to M150. This standard is equivalent to the international standard ISO 273-1979 "Fasteners - Through holes for bolts and screws". GB/T 5277-1985 Fasteners Bolt and Screw Through Holes GB/T5277-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Fasteners
Through holes for bolts and screws
Fasteners --Clearance holes
for bolts and screws
This standard specifies the dimensions of through holes for bolts and screws with thread specifications of M1 to M150. This standard is equivalent to the international standard ISO273--1979 "Fasteners-Through holes for bolts and screws". 1 Size
Thread Specifications
Published by the National Bureau of Standards on August 1, 1985
Fine Assembly
Medium Assembly
UDC621.882
15+621
.882.6
GB5277-85bzxZ.net
Replaces GB152-76
Related Parts
Rough Assembly
Implemented on June 1, 1986
Thread Specifications
GB 5277-85
Fine assembly
Medium assembly
Rough assembly
2 Tolerances
Unless otherwise specified, the tolerances for through holes shall be as follows: Fine assembly series: H12
Medium assembly series: H13,
GB 5277-85
Rough assembly series: H14.
If it is necessary to avoid interference between the edge of the through hole and the lower fillet of the bolt head, chamfering is recommended. Additional notes:
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Standardization Research Institute of the Ministry of Machinery Industry. 349
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