GB/T 5276-1985 Fasteners Bolts, Screws, Studs and Nuts Size Codes and Markings GB/T5276-1985 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Fasteners-Bolts, screws, studs and nuts-Symbols and designations of dimensions
Fasteners-Bolts, screws, studs and nuts-Symbols and designations of dimensions This standard specifies the codes and marking methods for marking bolts, screws, studs and nuts. UDC 621. 882
GB527685
This standard is equivalent to the international standard ISO225-1983 "Fasteners-Bolts, screws, studs and nuts-Symbols and designations of dimensions". 1 Bolts, screws and studs
1.1 Hexagonal head products
15°30
Equal thickness rod
1.2 Hexagonal flange bolts
Promulgated by the National Bureau of Standards on August 1, 1985
Implementation on June 1, 1986
1.3 Hexagon socket screws
1.3.1 Cylindrical head
1.3.2 Countersunk head
GB 5276-85
1.4 Slotted and cross-recessed screws
GB 5276-85
1.5 Studs
GB5276-85
Thread undercut, see GB3 "Thread finish, shoulder distance, undercut and chamfer". Screw into metal end
Nut endbzxz.net
1.6 Set screw
GB5276-85
1.7 Meter end
For the ends of bolts, studs and screws, see GB2 "Fasteners - Ends of externally threaded parts". Chamfered end
Chamfered end
Cylindrical end
Conical end
Inlaid end
Scraped end
1.8 Contents of dimension code
GB 527685
Distance from the last complete thread to the bearing surfaceThread length
Thread length of the stud (screwed into the metal end)
Height of the gasket part or thickness of the flange (or flange)Basic major diameter of the thread (nominal diameter)
Transition circle diameter
Flange (flange) diameter
Diameter of the chamfered surface
Diameter of the undercut (groove)
Head diameter
Diameter of the split pin hole
Diameter of the scraped end
Diameter of the flat end or cylindrical end
Scraping width
Diameter of the unthreaded rod
Diameter of the truncated cone end
Gasket surface ( Bearing surface) diameter
Concave end diameter
Diagonal width
Height of the semi-countersunk head spherical (elliptical) part
Undercut groove width
Head height
Wrench height
Nominal length
Distance from the cotter pin hole to the end of the thread
Transition length
Distance from the last thread to the bearing surfaceDistance from the center line of the cotter pin hole to the bearing surfaceLength of the tapered part of the scraped end
Length of the scraped end
Length of the unthreaded shank
Total length
Cross groove wing diameter
Slot width
2 Nut||t t||2.1 Hexagonal nut
GB5276--85
Head fillet radius
End fillet radius
Head spherical radius
Across-flat width
Depth of the screwing part or the slot depth
Length of incomplete thread
Thickness between the screwing part and the support surface or the thickness between the groove bottom and the support surfaceThread end length
End length
Countersunk angle
Flange angle
2.2 Slotted and crown nuts
2.3 Contents of dimension code
GB5276—85
Height of the washer part Degree or thickness of flange (or flange) Basic major diameter of thread (nominal diameter)
Counterbore diameter
Flange (flange) diameter
Crown diameter
Bearing surface diameter
Diagonal width
Nut height
Wrench height
Slot width
Across-edge width
Bottom thickness
Flange angle
Counterbore angle
Additional instructions:
GB5276
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. 346
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