This standard specifies the torque test and breaking torque value of bolts and screws with a nominal diameter of 1 to 10 mm and a performance grade of 8.8 to 12.9 (GB 3098.1). This standard applies to bolts and screws with thread specifications less than M3, for which the minimum tensile load and guaranteed load are not specified in GB 3098.1; and bolts and screws with a nominal diameter of 3 to 10 mm but too short to be subjected to tensile tests. GB/T 3098.13-1996 Mechanical properties of fasteners Torque test and breaking torque of bolts and screws Nominal diameter 1?10mm GB/T3098.13-1996 Standard download decompression password: www.bzxz.net

GB/T 3098.13--1996
This standard is equivalent to the international standard ISO898-7:1992 "Mechanical properties of fasteners Part 7: Torque test and minimum torque for bolts and screws with nominal diameters of 1 mm to 10 mm". The general title of GB3098 is "Mechanical properties of fasteners", which includes the following parts: GB 3098. 1--82
-GB 3098. 2--82
-GB 3098. 3-82
GB 3098. 486
GB 3098. 5--85
GB 3098. 6--86
-GB 3098. 7-86
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Bolts, screws and studs
Set screws
Fine pitch nuts
Self-tapping screws
Stainless steel bolts, screws, studs and nutsSelf-tapping screwsCoarse pitchNormal thread
Mechanical properties of fastenersThreaded connections for heat-resistant use-GB/T 3098. 8--92
Effective torque steel hexagonal locking nutsMechanical and working properties-GB/T 3098.9-93
GB/T 3098. 10—93
Mechanical properties of fasteners Non-metallic bolts, screws, studs and nuts-GB/T 3098.11-1995
Mechanical properties of fasteners
Mechanical properties of fasteners
GB/T 3098.12-1996
GB/T 3098. 13—-1996
Mechanical properties of fasteners
1~10 mmwwW.bzxz.Net
Appendix A of this standard is a suggestive appendix.
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Fastener Standardization. Self-drilling and self-sealing screws
Nut cone proof load test
Torque test and breaking torque nominal diameter of bolts and screws
This standard was drafted by the Mechanical Science Research Institute of the Ministry of Machinery Industry. GB/T 3098.13—-1996
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The development of international standards is carried out through ISO technical committees. Each member body may participate in the committee if it is interested in the project carried out by a technical committee. Governmental and non-governmental international organizations related to ISO may also participate in this work. ISO has close ties with the International Electrotechnical Commission (IEC) in electrotechnical standardization. Draft international standards adopted by the technical committees are circulated to all member bodies for voting. The formal publication of international standards requires at least 75% of the member bodies to vote in favor.
International Standard IS O898-7 was developed by ISO/TC2 Technical Committee for Fasteners, SC1 Technical Committee for Mechanical Properties of Fasteners. The general title of ISO898 is "Mechanical Properties of Fasteners", which includes the following parts: Part 1: Bolts, Screws and Studs
Part 2 Coarse Pitch of Nuts with Specified Guaranteed Load Values ​​- Part 5 Set Screws and Similar Threaded Fasteners Not Under Tensile Stress Part 6: Fine Pitch of Nuts with Specified Guaranteed Load Values ​​Part 7: Torque Test and Minimum Torque of Bolts and Screws Nominal Diameter 1 to 10mm Appendix A is a suggestive appendix.
1 Scope
National Standard of the People's Republic of China
Mechanical Properties of Fasteners
Torque Test and Destructive Torque of Bolts and Screws Nominal Diameter 1 to 10mm
Mechanical properties of fastenersTorsional test and minimum torques for boltsand screws with nominal diameters 1 mm to 10 mmGB/T 3098.13—1996
idt ISO 898-7:1992
This standard specifies the torque test and breaking torque values ​​for bolts and screws with nominal diameters of 1 to 10 mm and performance grades of 8.8 to 12.9 (GB3098.1).
This standard applies to bolts and screws with thread specifications less than M3 and for which the minimum tensile load and proof load are not specified in GB3098.1: and nominal diameters of 3 to 10 mm mm, but the length is too short to carry out the tensile test of bolts and screws. The breaking torque does not apply to hexagon socket set screws. 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB3098.1-82 Mechanical properties of fasteners Bolts, screws and studs 3 Torque test
3.1 Principle
Clamp the tested bolt or screw in the test device and measure its breaking torque. 3.2 Device (instrument)
3.2.1 Torque test device, as shown in Figure 1. 3.2.2 The indication of the torque meter shall not exceed five times the minimum breaking torque specified for the test piece; the maximum error of the torque meter is ±7% of the minimum breaking torque of the test piece.
3.3 Test conditions
During the test, the bolt or screw shall be subjected only to torsion, the value of which shall be as specified in Table 2. The specimen shall not break before the minimum breaking torque is reached. During the test, there shall be no friction between the bolt or screw head and the threaded part that would affect the test results. 3.4 Procedure
Insert the bolt or screw specimen into the test fixture with at least two complete threads and at least a thread diameter between the fixture and the bolt or screw head, then clamp (see Figure 1); apply torque continuously and smoothly. Approved by the State Bureau of Technical Supervision on December 18, 1996 176
Implementation on July 1, 1997
4 Minimum breaking torque
The minimum breaking torque is determined by the following formula
Wherein, Wpmin=Yuan/16·dimin
TBmin -X · Obmin
Wherein, MBmin
GB/T 3098.13-1996
Split internal thread
Figure 1 Torque test device
MBmin TBmin · WPmin
Minimum breaking torque (see Table 2);
Torsional strength;
Torsional section modulus:
Minimum value of external thread minor diameter;
Tensile strength;
Strength ratio/% (see Table 1).
Performance level
Ratio x
Thread specification
Minimum breaking torque\
Memin, N·m
Performance level
Strength ratio X
Minimum breaking torque
Thread specification
M10×1.25
Minimum breaking torque
Myauin+N·m
Performance level
1) The minimum breaking torque value is applicable to threads of 6 g, 6 f and 6 e. 177
GB/T3098.13-1996
Appendix A
(Suggestive Appendix)
GB3098.1 specifies the performance levels of bolts and screws, but only gives the minimum breaking load and proof load for M3 and above. In the case of smaller bolts and screws, it is impossible to accurately determine the breaking load and proof load due to the influence of thread accuracy and test device accuracy; bolts and screws with specifications larger than M3 to M10 are often too short to carry out tension (or proof load) tests. Therefore, the minimum breaking torque is specified for bolts and screws of M1 to M10 (including fine thread M8×1.M10×1 and M10×1.25), which provides a basis for evaluating their performance. At present, the minimum breaking torque is only specified for grades 8.8 to 12.9. Because the test results for low performance grades are very scattered,More research is needed. The minimum breaking torque given is only applicable when friction is not considered; the type of test device can be selected according to the provisions of this standard. Figure 1 is only an example of a test device.
The minimum breaking torque is obtained based on the thread cross section. This standard is calculated based on the minimum value of the 6g thread diameter. Test results show that these torque values ​​can also be used for 6f and 6e. 178
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