GB/T 5789-1986 Hexagon flange bolts, enlarged series, grade B

GB/T 5789-1986 Hexagonal Flange Bolts, Enlarged Series, Grade B GB/T5789-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hexagon flanke bolts-Heavy
series-Product grade B
UDC 621.882.6
GB5789-86
This standard specifies hexagonal flange bolts with wide thread specifications of M5 to M20 and wide width across flats of the heavy series and grade B. Reference standard
GB196-81 "Basic dimensions of ordinary threads (diameter 1 to 600mm)"! GB197-81 "Ordinary thread tolerance * fit (diameter 1 ~ 355mm)", GB2-85 "Fasteners-ends of external threaded parts": GB3098.1-82 "Fasteners Mechanical Properties Bolts, Screws and Studs": GB3098.6-86 "Fasteners Mechanical Properties Stainless Steel Bolts, Screws, Studs and Nuts" 1GB3103.1-82 "Fasteners Tolerance Bolts, Screws and Nuts" GB5267-85 "Threaded Fasteners Electroplating" + GB5779.1-86 "Fasteners Surface Defects-Bolts, Screws and Studs-General Requirements"; GB5779.3-86 "Fasteners Surface Defects-Bolts, Screws and Studs-Special Requirements" GB90-85 "Fasteners Acceptance Inspection, Marking and Packaging", 3 Size www.bzxz.net
Commodity specifications are specified in the drawings, Tables 1 and 2. Issued by the National Bureau of Standards on January 17, 1986. Implemented on October 1, 1986. 15 ~ 25. The type of concave cavity is selected by the manufacturer. 0 ~ 1\30. X-enlargement. GB5789-86. Angle end. 15 ~ 25. The bearing surface and the fillet should be smoothly connected. The end should be in accordance with the provisions of GB2-85: gm = 1. Smin =! m#×—5P, P pitch. Thread specification. 125-1200. Note: Avoid using the specifications in brackets as much as possible. GB5789—86
GB 5789—86
2022*26
Technical conditions
As specified in Table 3.
Mechanical properties
Product grade
Surface treatment
Surface defects
Acceptance and packaging
GB 5789—86
GB 196—81, GB 197—81
8.8 ~12.9
GB 3098.1—82
Stainless steel
A2—70
GB 3098.6—86
GB3103.182
①Oxidation
②Galvanized passivation GB5267—85
GB 5779,1-86, GE 5779.3-86 (only for 12.9 grade GB90-85
Marking example of hexagonal flange bolts with thread specification d=M12, nominal length !=80mm, performance grade 8.8, surface oxidation, type A or B:
Bolt GB5789-86-M12×80
Marking example of octagonal flange bolts with thread specification d=M12, nominal length l=80mm, performance grade 8.8, surface oxidation, type A:
GB.5789-86-AM12×80
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 Institute of the Ministry of Machinery Industry. This standard was drafted by the Standardization Institute of the Ministry of Machinery Industry.
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