JB/T 9765.3-1999 This standard is a revision of ZB J92 009-89 "Technical Conditions for Cylinder Head Bolts for Internal Combustion Engines". During the revision, only editorial modifications were made in accordance with relevant regulations, and the main technical content remained unchanged. This standard specifies the technical requirements, inspection methods, inspection rules, marking and packaging for cylinder head nuts and flywheel nuts for internal combustion engines. This standard applies to nuts on cylinder head bolts and flywheel bolts of reciprocating piston internal combustion engines with a cylinder diameter less than or equal to 200mm. This standard was first issued in 1978 and revised for the first time in 1989. JB/T 9765.3-1999 Technical Conditions for Cylinder Head Nuts and Flywheel Nuts for Internal Combustion Engines JB/T9765.3-1999 Standard download decompression password: www.bzxz.net

IC527,020
Machinery Industry Standard of the People's Republic of China
JR/T 9765.3-1999
Internal combustion eagines-Cylinder head and flywheel nuts Specifications
1999-09-17 Issued
State Bureau of Machinery Industry
2000-01-01 Implementation
JB/T9765.3—1999
This standard is a revision of the Technical Specifications for Cylinder Head Nuts and Flywheel Nuts of Internal Combustion Engines (2009-89): editorial changes were made to the original standard during the revision, but the main technical content remained unchanged. This standard shall replace ZBJ929-9 from the date of implementation. This standard was proposed by the National Technical Conference and drafted by Shanghai Internal Combustion Engine Research Institute. The drafter of this standard is Du Ge.
This standard was first issued in 1978 and was first subscribed in 1989. Mechanical Industry Standard of the People's Republic of China
Technical conditions for cylinder head nuts and flywheel nuts for internal combustion engines
Internal combustion engiaerCyinder head and flyheel nuts Specinkatlans
"Scope
B/T965.3—1999
Generation 7.F J42 009-R9
This standard specifies the technical requirements, inspection methods, inspection rules and markings for cylinder head nuts and flywheel nuts for internal combustion engines, and covers the nuts (hereinafter referred to as nuts) on flywheel bolts of cylinder heads with a cylinder diameter of less than 200mm.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. The parties using this standard should discuss the possibility of using the latest version of the following standards. GAT 90 --1985
GE/T 197—1981
GB/T 699--1999
GB/T1184——1996
GBT3077--1988
GB/T 309B.2—1982
GB/ 3098.4—1986
Technical requirements
Fasteners acceptance inspection, standard state and replacement
Tolerance and fit of screw thread (straight 1355mm)High-quality iodine structural steel
Shape and position light valley difference, unacceptable difference
Technical conditions of alloy structural steel
Mechanical properties of fastenersNuts
Mechanical properties of fastenersFine pitch nutswww.bzxz.net
3.1 The nut shall comply with the requirements of this standard and be manufactured according to the product drawings and technical documents approved by the prescribed procedures. 3.2 The nut material shall be 35.40.45 steel specified in GB/T699—1999, 40Cr.35CrM0A, 40MrVB and other alloy steels specified in GB/T3077—1988: Other materials with mechanical properties meeting the requirements of 3.3 of this standard may also be used. 3.3 The nut shall be heat treated and its mechanical properties shall not be lower than the grade specified in GB/T30982-1982 and GB/3098.4-1986. The hardness difference between the nut and the nut is: 35, 4g and 45 steel less than or equal to 5 HRC units: alloy small Ding or equal to 3 HRC single use.
3.4 ​​The thread tolerance zone of the nut shall be 6H as specified in Table 7 of GB/T.197-1981. 3.5 Surface roughness of various parts of the nut:
) R of the threaded part is 3.2.±m:
3.6 The shape and position tolerance of the nut parts shall meet the following requirements: National Beijing Machinery Industry Products 1999-09-17 approved 200(-01-Q1 implementation
35/T 9765.31999
a) The verticality of the nut support surface to the thread axis shall be grade 10 in Table B3 of GB/T114-1996 b) The symmetry of the hexagonal opposite sides of the nut to the thread axis is grade 2IT12. 3.7 The nut is not allowed to have defects such as burrs, cracks, scars and rust. 3.8 The surface of the nut shall be oxidized or treated with anti-rust. Inspection method
.1 Stress test in accordance with GB/T3098.2 and GB/T3098.4 4.2 Hardness test in accordance with GB/T30982 and GB/T3098.4 4.3 The verticality test of the nut bearing surface to the medium-grained shaft can be carried out on a special tool. 4.4 The surface roughness is measured by comparison method or other methods. The inspection is short.
5. The product can only be shipped after passing the inspection by the quality inspection department of the manufacturer. 5.2 When the ordering unit conducts random inspection of product quality, it shall be carried out in accordance with the provisions of GB/T90. 6 Marking and packaging
Marking and packaging shall comply with the provisions of GB90.
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