GB/T 3098.9-2010 English PDF (GB/T3098.9-2010)

GB/T 3098.9-2010: Mechanical properties of fasteners -- Prevailing torque type steel nuts
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GB/T 3098.9-2010
ICS21.060.20
J13
National Standards of People's Republic of China
GB/T 3098.9-2010/ISO 2320..2008
Replace GB/T 3098.9-2002
Fastener mechanical properties effective torque steel lock nut
(ISO 2320..2008, IDT)
Released on.2011-01-10
2011-10-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by China National Standardization Administration
Contents
Foreword I
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Code 2
5 Thread 2
6 Lubrication 2
7 Mechanical properties of effective torque nuts 3
8 Requirements for working performance of effective torque 3
9 Test method 14
Appendix A (Normative Appendix) Temperature Resistance Test of Effective Torque Nuts for Non-Metal Inserts 18
Appendix B (informative appendix) Total friction coefficient evaluation basis 19
Foreword
This part of GB/T 3098 (hereinafter referred to as this part) is one of the national standards "fastener mechanical properties" series of standards. The series
include.
--- GB/T 3098.1-2010 Mechanical properties of fasteners Bolts, screws and studs;
--- GB/T 3098.2-2000 fastener mechanical performance nut coarse thread;
--- GB/T 3098.3-2000 set screws for mechanical properties of fasteners;
--- GB/T 3098.4-2000 mechanical properties of fasteners, fine thread of nuts;
--- GB/T 3098.5-2000 self-tapping screws for mechanical properties of fasteners;
--- GB/T 3098.6-2000 mechanical properties of fasteners stainless steel bolts, screws and studs;
--- GB/T 3098.7-2000 Fastener mechanical properties self-extruded screws;
--- GB/T 3098.8-2010 Mechanical properties of fasteners-bolt connection parts used at -200 ℃ ~ 700 ℃;
--- GB/T 3098.10-1993 Mechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrous metals;
--- GB/T 3098.11-2002 mechanical properties of fasteners self-drilling self-tapping screws;
--- GB/T 3098.12-1996 Mechanical performance of fasteners, cone taper guaranteed load test;
--- GB/T 3098.13-1996 Mechanical properties of fasteners Torque test of bolts and screws and nominal diameter of breaking torque
1 ~ 10mm;
--- GB/T 3098.14-2000 Fastener mechanical performance nut expansion test;
--- GB/T 3098.15-2000 fastener mechanical properties stainless steel nut;
--- GB/T 3098.16-2000 mechanical properties of fasteners stainless steel set screws;
--- GB/T 3098.17-1996 Fastener mechanical properties check hydrogen embrittlement preload test parallel bearing surface method;
--- GB/T 3098.18-2004 blind fastener test method for mechanical properties of fasteners;
--- GB/T 3098.19-2004 fastener mechanical properties core pulling rivets;
--- GB/T 3098.20-2004 Fastener mechanical performance butterfly nut guaranteed torque;
--- GB/T 3098.21-2008 Fastener mechanical properties stainless steel self-tapping screws;
--- GB/T 3098.22-2009 Mechanical properties of fasteners Ultra-fine grain non-quenched and tempered steel bolts, screws and studs.
This part is Part 9 of GB/T 3098.
This part is equivalent to adopting ISO 2320..2008 "Effective Torque Type Steel Nuts Mechanical and Working Performance" (English version), the main amendments are as follows.
--- In quoted documents, replace international standards with Chinese standards (Chapter 2).
This part replaces GB/T 3098.9-2002 "Effective Torque Type Steel Hexagon Lock Nuts for Fastener Mechanical Properties".
Compared with GB/T 3098.9-2002, the main changes in this part are as follows.
--- Adjust the working temperature range of the all-metal lock nut to -50 ℃ ~ 150 ℃ (Chapter 1);
--- New terms and definitions (Chapter 3);
--- New mark code and definition (Chapter 4);
--- Add 5, 9 grade nut working performance test data table (Chapter 8);
--- Add Appendix B;
--- Adjusting nut performance test data table (Chapter 8);
--- Adjust the effective torque performance test program (9.3.4);
--- Chapter 4 of the original standard, part of Chapter 5 and Chapter 7 mechanical performance data table, and the provisions are implemented in accordance with the corresponding standard;
--- Chapter 9 of the original standard has been cancelled;
--- Delete Appendix A of the original standard, but the regulations allow manual form.
Appendix A of this section is a normative appendix and Appendix B is an informative appendix.
This part is proposed by China Machinery Industry Federation.
This part is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85).
This section is responsible for drafting unit. China Machine Productivity Promotion Center.
Participated in the drafting of this part. Machinery Industry General Parts Product Quality Supervision and Inspection Center, National Standard Parts Product Quality Supervision and Inspection
center.
The previous versions of the standard replaced by this part are as follows.
--- GB 3098.9-1993, GB/T 3098.9-2002;
--- GB 928-1980.
Fastener mechanical properties effective torque steel lock nut
1 Scope
This part of GB/T 3098 stipulates that when the test is performed under the conditions of ambient temperature of 10 ℃ ~ 35 ℃, the effective torque type steel lock screw
The mechanical and working performance of the female. It includes a single test to determine the effective torque performance (working performance) and/or torque-clamping force performance.
This section applies to effective torque type all-metal lock nuts and non-metal insert lock nuts that meet the following requirements.
--- Ordinary thread conforming to GB/T 192 regulations;
--- A combination of diameter and pitch in accordance with GB/T 193;
--- Thread specifications M3 ~ M39, mechanical properties comply with GB/T 3098.2;
--- Thread specification M8 × 1 ~ M39 × 3, mechanical properties conform to GB/T 3098.4;
--- The working temperature range of effective torque type all metal lock nut is -50 ℃ ~ 150 ℃;
Note 1. See Chapter 7, paragraph 3.
--- The operating temperature range of effective torque type non-metallic insert lock nut is -50 ℃ ~ 120 ℃.
Note 2. See Chapter 7, paragraph 4.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated versions apply to this article
For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 192 basic thread basic tooth profile (GB/T 192-2003, ISO 68-1..1998, ISO general purpose screw
threads-Basicprofile-Psrt1. Metricscrewthreads, MOD)
GB/T 193 Ordinary thread diameter and pitch series (GB/T 193-2003, ISO 261..1998, ISO general purpose
metricscrewthreads-Generalplan, MOD)
GB/T 3098.1 Mechanical properties of fasteners Bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1..2009, MOD)
GB/T 3098.2 Fastener mechanical properties Nut coarse thread (GB/T 3098.2-2000, idtISO 898-2..1992)
GB/T 3098.4 Fastener mechanical properties Nut fine thread (GB/T 3098.4-2000, idtISO 898-6..1994)
GB/T 5277 through holes for fastener bolts and screws (GB/T 5277-1985, eqvISO 273. 1979)
GB/T 9145 medium thread with medium precision, preferred limit size of series (GB/T 9145-2003, ISO 965-2..1998, MOD)
GB/T 16823.3 Fastener torque-clamping force test (GB/T 16823.3-2010, ISO 16047..2005, IDT)
3 Terms and definitions
The terms and definitions established in GB/T 16823.3 and the following apply to this part.
3.1
Effective torque nut
With its own effective torque characteristics, the nut cannot rotate freely on the matching thread and can be provided in addition to the clamping force or compression force
A certain degree of function to prevent retreat.
3.2
Effective torque produced by the nut
Under no axial load, the torque required for the nut to rotate on the matching thread.
3.3
Screw in effective torque
The torque when the nut has no axial load on the matching thread.
3.4
Effective torque
Unscrew the nut until the axial load is removed, and continue to turn the torque that appears in 360 °.
3.5
Effective torque full metal nut
The nut has one or more metal elements that limit the nut thread and/or nut body or metal insert, while providing the effective torque characteristics.
3.6
Effective torque type non-metal insert nut
The nut has multiple components, and the non-metallic insert in the nut provides effective torque characteristics.
3.7
Sticky point
During tightening, the point where the clamping force appears for the first time.
4 Code
The following codes and the codes specified in GB/T 16823.3 are applicable to this part.
d Thread nominal diameter, mm
d4 Pin hole diameter, mm
Fp guaranteed load, N
F65 Evaluation of the lower limit load of the total friction coefficient, N
F75 Upper limit load for evaluating total friction coefficient, N
F80 Test clamping force, N
P pitch, mm
TFv screwed in effective torque, Nm
TFd effective torque, Nm
T65 Evaluation of the lower limit torque of the total friction coefficient, N · m
T75 Upper limit torque for evaluating the total friction coefficient, N · m
T80 clamping force is 80% of the test torque corresponding to the guaranteed load, N · m
μtot Total friction coefficient
5 thread
In addition to the effective torque part, the thread of the nut should meet the requirements of GB/T 9145.
--- Effective torque nut of non-metallic insert should be able to be screwed to the insert smoothly by hand;
--- All metal nuts should be able to smoothly screw the pass gauge into at least one pitch by hand.
6 Lubrication
To meet performance requirements, manufacturers can choose lubricants for manufacturing lots.
7 Mechanical properties of effective torque nuts
The mechanical properties of effective torque nuts should meet the requirements of GB/T 3098.2 or GB/T 3098.4.
The test method for guaranteed load shall be in accordance with 9.2.
When the working temperature of the all-metal lock nut exceeds -50 ℃ ~ 150 ℃, the user
Consult to determine the applicable materials.
When the operating temperature is at or close to -50 ℃ and 120 ℃, the effective torque performance of the non-metallic insert lock nut may be reduced.
It is necessary to select a suitable non-metallic material. When the operating temperature exceeds the range of -50 ℃ ~ 120 ℃, the user
Consult with an expert to determine the applicable materials.
8 Requirements for effective torque working performance
The effective torque value should not exceed the value specified in Table 1 ~ Table 8.
The effective torque value should not be less than the values specified in Table 1 to Table 8.
For acceptance inspection, unless otherwise agreed, the first screw-in/screw-out test shall be performed.
For the initial type test and arbitration test, unless otherwise agreed, the fifth screw-out test shall be carried out.
As the number of repeated uses increases, the performance of the effective torque decreases. Before using the nut again, the user should consider the impact of the reduced performance.
When required, the effective torque type non-metallic insert lock nut shall be tested for temperature resistance according to Appendix A.
Paragraphs 3 and 4 of Chapter 7 also apply to performance requirements.
Table 1 Clamping force and effective torque of the 04-level effective torque nut test
Thread specification
(D) or
(D × P)
Test clamping force
F80a/N
Evaluation of total friction coefficient Clamping force μtotb Effective torque/(N · m)
Upper limit
F75c/N
Lower limit
F65d/N
Screw in for the first time
TFv, maxe
Unscrew for the first time
TFd, minf
Fifth screw out
TFd, minf
M3 1528 1433 1242 0.43 0.12 0.08
M4 2672 2505 2171 0.9 0.18 0.12
M5 4320 4050 3510 1.6 0.29 0.2
M6 6112 5730 4966 3 0.45 0.3
M7 8800 8250 7150 4.5 0.65 0.45
M8 11120 10425 9035
M8 × 1 11920 11175 9685
6 0.85 0.6
M10 17600 16500 14300
M10 × 1.25 18640 17475 15145
M10 × 1 19600 18375 15925
10.5 1.5 1
M12 25600 24000 20800
M12 × 1.5 26800 25125 21775
M12 × 1.25 28000 26250 22750
15.5 2.3 1.6
M14 34960 32775 28405
M14 × 1.5 38000 35625 30875
24 3.3 2.3
Table 1 (continued)
Thread specification
(D) or
(D × P)
Test clamping force
F80a/N
Evaluation of total friction coefficient Clamping force μtotb Effective torque/(N · m)
Upper limit
F75c/N
Lower limit
F65d/N
Screw in for the first time
TFv, maxe
Unscrew for the first time
TFd, minf
Fifth screw out
TFd, minf
M16 47760 44775 38805
M16 × 1.5 50800 47625 41275
32 4.5 3
M18 58400 54750 47450
M18 × 1.5 65360 61275 53105
42 6 4.2
M20 74480 69825 60515
M20 × 1.5 82720 77550 67210
54 7.5 5.3
M22 92080 86325 74815
M22 × 1.5 101200 94875 82225
68 9.5 6.5
M24 107280 100575 87165
M24 × 2 116720 109425 94835
80 11.5 8
M27 139520 130800 113360
M27 × 2 150800 141375 122525
94 13.5 10
M30 170560 159900 138580
M30 × 2 188800 177000 153400
M33 210960 197775 171405
M33 × 2 231360 216900 187980
M36 248400 232875.201825
M36 × 3 262960 246525 213655
M39 296720 278175 241085
M39 × 3 313120 293550 254410
Note. The statistical program control method (SPC) is not relevant to the evaluation of the effective torque test.
a The clamping force of the 04 grade nut with 3mm ≤d≤39mm is equal to 80% of the guaranteed load of the 04 grade nut
It is given in GB/T 3098.4.
b See Appendix B.
c The upper limit of the clamping force is equal to 75% of the guaranteed load, see Appendix B.
d The lower limit of the clamping force is equal to 65% of the guaranteed load, see Appendix B.
e The effective torque for the first screw-in is only applicable to all-metal lock nuts; for non-metallic insert lock nuts, the maximum value of the effective torque for the first screw-in is these
50% of the value.
f The values in the table are required to be completed under laboratory conditions. The application of these fasteners depends on their applicability, and the performance of the parts may also be affected during normal use
Change. When in doubt about product per...