JB/T 9765.1-1999 Technical requirements for cylinder head bolts for internal combustion engines

JB/T 9765.1-1999 This standard is a revision of ZB J92 006-88 "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 bolts for internal combustion engines. This standard applies to cylinder head bolts (including studs and 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 1988. JB/T 9765.1-1999 Technical Conditions for Cylinder Head Bolts for Internal Combustion Engines JB/T9765.1-1999 Standard download decompression password: www.bzxz.net

1C.527.020
Machinery Industry Standard of the People's Republic of China
JB/T9765.1--1999
Technical Conditions for Internal Combustion Engine Cylinder Head Bolts
Internal Combustion Engines-Cylinder Head BoltsSpecificatiaus
1999-09-17 Issued
National Machinery Industry Bureau
2000-01-01 Implementation
JB/T9765.1-1999
Specification of Technical Conditions. The original standard was edited when it was accepted. The blank standard is a modification of 2HJ92006--88 Internal Combustion Engine Cylinder Head Bolts, and the main technical content has been changed. This standard is in accordance with B192006-88 from the date of implementation. The entire standard is proposed and managed by the Internal Combustion Engine Standardization Technical Committee. The unit that issued this standard is Shanghai Internal Combustion Engine Research Institute. The main drafter of this standard is Xiang Rong.
4 Standard 10 First issued in 1978: First finalized in 1988. 1 Scope
Machinery Industry Standard of the People's Republic of China
Internal Combustion Engine Cylinder Head BoltswwW.bzxz.Net
Technical Conditions
Latcrnal Combustion Engines Cylinder Head Bolts-Speclfications
JB/T 9765.1—1999
Replacement ZB3920—88
This standard specifies the technical requirements, inspection methods, inspection rules and markings for cylinder head bolts of internal combustion engines. This standard is used for cylinder head bolts of internal combustion engines with a cylinder diameter of less than 200 mm (including double-headed bolts and nickel bolts, hereinafter referred to as commercial bolts).
1 Applicable Standards
The provisions contained in the above standards become the relevant documents through reference in this standard. The versions shown are valid when the standards are published. All standards may be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 90—1985
GD/T 197[9B1
GB/T699—1999
GB,T 1167--1996
GBT11841996
UBT 3077—-1988
GB/T309*1—1982|| tt||JB/T 8837.--[999
3 Technical requirements
Acceptance inspection, marking and packaging of fasteners
Tolerances and matching (diameter 1-155 mm) Quality structural smoke
Over-fit thread
Shape and position tolerances Note: Tolerance values
Technical conditions for structural steel
Mechanical properties of fasteners Bolts, screws and studs Metallographic inspection of internal combustion engine connecting bolts
3.1 Bolts shall comply with the requirements of this standard and shall be prepared and approved through the prescribed procedures Product drawings and technical documents. 3.7 Explosion bolt material - generally use 45 steel specified in GB/T699-1999 or 40Cr, 35CTM0A, 35CrMoV, 40MmVB, 40MnB and other alloy steels specified in GF/T3077-:1988; other materials with mechanical properties in accordance with the provisions of 3.3 of this standard may be used. 3.3 The bolt shall be heat treated, and its tensile strength, yield strength and hardness shall be determined according to 8.8, 9.B, 10.9, 12.9 in GB/T3098.1-192. The difference in hardness on the same bolt is: 4S less than or equal to 5 HRC units; less than or equal to 2 HRC units.
3.4 ​​The metallographic structure of the explosion bolt shall be evaluated according to JBF837. 3.5.1 Double-head bolts shall be in accordance with the first type of matching tolerance specified in BT1167-1996: The tolerance band of the threaded female end shall be 6h specified in GB197-198. The State Bureau of Machinery Industry approved the implementation of 2000-D1-01 on September 17, 1999. 3B/T$765.1-1999. 3.5.2 The tolerance band of the threaded female end shall be 6b specified in GB/T197-1981. 3.6 Surface roughness of various parts of bolts: a) Threaded part R 1.6 μm: b) Head support surface R, 3.2 μm: c) Shaft surface R 32.
3.7 The shape and position tolerances of the bolt parts shall meet the following requirements: a) The verticality of the bolt head bearing surface to the rod axis shall be in accordance with Grade 9 in Table B7 of GB/T14-1996 b) The verticality of the thread axis to the rod axis shall be in accordance with Grade 11 in Table 4 of GB/T1184-1996. The tolerance of the bolt head bearing surface to the rod axis shall be in accordance with Grade 11 in Table 1 of GB/T1184-1996. 3.8 The bolt rod, the lower part and the head bearing surface shall not be allowed to have defects such as burrs, cracks, scratches and rust. Under the condition that the thread can be properly applied, the lower end is allowed to have incomplete thread penetration. 3.9 The surface of the bolt shall be oxidized or otherwise treated for rust prevention. 4 Acid method
4.1 Anti-strength and yield strength test shall be in accordance with RT09.! 4.2 Hardness test shall be carried out in accordance with GB/T3098.1. 4.3 The more precise measurement of the screw shall be carried out by testing with a ring gauge of the corresponding level. For the case where there is no ring gauge or the ring gauge is close to the limit value and cannot be calibrated, a micrometer, a thread micrometer, a three-pin or a tool microscope may be used for measurement. 4.4 The verticality of the screw head bearing surface to the axis of the screw and the coaxiality of the thread bearing and the axis of the screw shall be tested on a special cover: 4.5 The surface roughness of the bolt rod shall be measured by a surface roughness measurement protocol, and the surface roughness of the remaining parts shall be tested by a surface and roughness sample comparison method.
4.6 Metallographic microscopic inspection shall be carried out in accordance with the provisions of the JB Department. 5 Inspection regulations
5. The bolt shall be inspected by the quality inspection department of the manufacturer before it can be released! 5.2 Order form sampling inspection of product quality, according to G3/T90 location, 6 marking, packaging || tt || damage mark, packaging certificate in accordance with GBTS0 regulations
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