Some standard content:
JB/T10031---1999
This standard is revised on the basis of ZBJ42037--89 "Pipe Thread Gauges for Thread Seals". This standard is consistent with the technical content of ZBJ42037-89, and has only been re-edited according to relevant regulations. This standard replaces ZBJ42037-~89 from the date of implementation. Appendix A of this standard is the standard appendix.
Appendix B of this standard is the reminder appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Measuring Tools and Instruments. The responsible drafting unit of this standard: Chengdu Measuring Tools and Cutting Tools General Factory. The participating drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Ren Peiyuan, Wu Xiangen, Liu Zhong.
This standard was first issued in 1989.
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Gauges for pipe threads where pressure-tightjoints are made on the threadsJB/T 10031--1999
Replaces ZBJ12037---89
This standard specifies the name, code, size, tolerance, inspection method, marking and packaging of pipe thread gauges for thread sealing. This standard is applicable to the inspection of the dimensions of tapered threads and cylindrical internal threads specified in GB/T7306. 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, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T7306--1987 Pipe threads sealed with threads 3 Symbols
According to the provisions of GB/T7306, the symbols used in this standard and their names or meanings are shown in Table 1. Table 1
Name or meaning
Clearance groove width at the major diameter of the truncated internal thread profile or the minor diameter of the truncated external thread profile Lower limit of the tapered thread plug gauge (thread calibration plug gauge base surface) Step width Upper limit of the tapered thread plug gauge Step width
The major diameters of the workpiece external thread and the workpiece internal thread base surface are respectively the minor diameters of the workpiece external thread and the workpiece internal thread base surface are respectively the middle diameter of the workpiece external thread and the workpiece internal thread base surface are respectively the diameter of the tapered thread ring gauge countersunk hole on the small end face of the tapered thread plug gauge basic Length
The length of a taper thread plug gauge beyond its base surfaceThe shortest length from the small end face of a taper thread plug gauge to the base surfaceThe total length of a taper thread ring gauge
The length of the threaded portion of a taper thread ring gauge
The reference distance for calibrating a thread plug gauge
Approved by the State Bureau of Machinery Industry on May 20, 1999Implemented on January 1, 2000
4 Product classification
4.1 Gauge classification
Number of teeth per inch
JB/T 10031—1999
Table 1 ((Complete)
Name or
Base surface position tolerance of external thread of workpiece
Base surface position tolerance of internal thread of workpiece
Pitch diameter tolerance of base surface of thread calibration plug gauge
Pitch diameter tolerance of base surface of thread working plug gauge
Pitch diameter tolerance of base surface of thread working ring gauge
Twice the height of the circle of the crest or root
Wear limit of gauge
Thread profile half angle
Cree or root arc radius
Allowable deviation of clearance groove of truncated thread profile relative to thread profile In the axial section of the truncated thread profile, the radial distance between the pitch diameter line and the top end (towards the crest side) of the straight part of the tooth side is within the truncated thread profile. The pipe thread gauge used for thread sealing is the radial distance between the middle diameter line and the end of the straight part of the tooth side (towards the bottom side) in the axial section. It is divided into tapered thread working gauge and tapered thread calibration gauge according to its performance. Tapered thread working gauge: refers to the thread gauge used by the operator in the process of manufacturing the workpiece thread. Tapered thread calibration gauge: refers to the thread gauge used when manufacturing the thread working ring gauge and checking whether the working thread ring gauge in use has been worn.
The name, code, function and characteristics of the gauge are shown in Table 2. Table 2
Gauge name
Full tooth type tapered thread
Working plug gauge
Full tooth type tapered thread
Working ring gauge
Truncate tooth type tapered thread
Thread working plug Gauge
Truncate tooth type conical screw
thread working ring gauge
thread calibration plug gauge
Check the
major diameter, minor diameter and effective
Check the
major diameter, minor diameter and effective
Check the
-medium diameter of the
Check the
-medium diameter of the
Check the
-medium diameter of the
Check the
new thread ring gauge
and the
effective mean diameter of the
complete external
thread profile
complete internal
thread profile
Truncate external
thread profile
Truncate internal
thread Thread type
Truncate external
Thread type
Rules for use
The base surface of the internal thread of the workpiece should be between the two measuring surfaces of the plug gauge or flush with the measuring surface
The small end plane of the external thread of the workpiece should be between the two measuring surfaces of the ring gauge or flush with the measuring surface
The base surface of the internal thread of the workpiece should be between the two measuring surfaces of the plug gauge or flush with the measuring surface
The small end plane of the external thread of the workpiece should be between the two measuring surfaces of the ring gauge or flush with the measuring surface
The base surface of the thread ring gauge should be flush with the base surface of the calibration plug gauge, and the deviation shall not be greater than 0.1P
4.2 Gauge marking
JB/T10031-1999
The marking of the gauge consists of the gauge code and the size code. 1V The marking example of the tapered thread gauge is shown in Table 3. Table 3
Gauge name
Full pitch tapered thread working plug gauge
Full pitch tapered thread working ring gauge
Truncate pitch tapered thread working plug gauge
Truncate pitch tapered thread working ring gauge
Thread calibration plug gauge
5 Thread gauge tolerance
The base diameter tolerance of the thread gauge is shown in Table 4. 5.1
Size code
1/16;1/8
1/4+3/8
1/2 +3/4
The pitch tolerance, taper deviation and tooth profile half-angle deviation of the thread gauge are shown in Table 5. 5.2
Size code
1/16,1/8
1/4;3/8
1/2:3/4
1~～2
2岁～6
Pitch tolerance
Marking example
Taper deviation
Note: The pitch tolerance applies to any number of teeth within the length of the thread gauge, and the actual deviation can be positive or negative. Thread profile of thread gauge
6.1 The complete thread profile is shown in Figure 1, and the values of its top circle elements are shown in Table 6.0.010
Tooth profile half-angle deviation
Size code
1/16;1/8
1/4+3/8
1/2:3/4
2 years~6
Butterfly pattern center axis
Thread center axis
JB/T 10031—1999
JB/T10031—1999
6.2 The truncated thread profile is shown in Figure 2, and the values of its relevant elements are shown in Table 7. The shapes of the gap groove and the tooth bottom are not specified in this standard. Base surface
Parallel to thread axis
a47*24
Size code
1/16;1/8
1/4;3/8
1/2;3/4
2%～6
Parallel to thread axis
6.3 The clearance groove is allowed to have an offset S relative to the thread profile, see Figure 3 and Table 8. When the actual offset S is less than the allowable offset S, the deviation of b, can be increased, and the increase value is equal to twice the difference between the allowable offset S and the actual offset S'. P/2
Center line of the whale groove
Center line of the thread tooth type
Size code
1/16;1/8
1/4;3/8
1/2,3/4
2 years~6
7Structural type and size of the working part of the gauge JB/T10031--1999
7.1 The structure of the full-profile tapered thread working plug gauge and the truncated-profile tapered thread working plug gauge is shown in Figure 4, and the dimensions are shown in Table 9. 7.2 The structure of the thread calibration plug gauge is shown in Figure 5, and the dimensions are shown in Table 9. 7.3 The structure of the full-profile tapered thread working ring gauge and the truncated-profile tapered thread working ring gauge is shown in Figure 6, and the dimensions are shown in Table 9. Base surface
x Enlarged view
JB/T 10031--1999
162. 351 1 160. 872
6.927 1 9. 236
8 Technical requirements
JB/T10031-1999
Table 9 (end)
8.1 The values specified in this standard are based on standard measurement conditions, that is, the temperature is 20°C and the measuring force is 0.2 The measuring surface of the thread gauge should not have rust, scratches or other defects that obviously affect the appearance and quality of use, and other surfaces should not have rust and 8.2
cracks.
8.3 The connection between the gauge head and the handle should be firm and reliable, and should not loosen or fall off during use. 8.4 Thread gauges can be made of alloy tool steel, carbon tool steel and other wear-resistant materials. 8.5 The incomplete buckle shapes at both ends of the thread gauge should be trimmed to complete buckle shapes. 8.6 The hardness of the measuring surface of the steel thread gauge should be 664~856HV. 8.7 Surface roughness of the working surface of the thread gauge: tooth side surface: Rao.4μm;
truncated tooth type cone thread working plug gauge and thread calibration plug gauge major diameter: Ra0.8μm; truncated tooth type cone thread working ring gauge minor diameter: Rao.8μm. 8.8 Thread gauges should be treated for stability. 9 Gauge size calculation formula
The calculation formulas for the major diameter, pitch diameter and minor diameter on the reference plane of the thread gauge are shown in Table 10. 460
Ground gauge types
Full-thread taper thread
Working plug gauge
Truncate-thread taper screw
Thread working plug gauge
Full-thread taper thread
Working ring gauge
Truncate-thread taper screw
Thread working ring gauge
Thread calibration plug gauge
Basic size
JB/T 10031- 1999
(D+TPl.)1-2F,
10 Inspection of thread gauges
10.1 Inspection of new thread gauges
Basic size
Basic size
≤（D+2F2）, with clearance groove
For relevant dimensions and tolerances, see Table 4. Table 5 and Table 9d2-TR
（drTR·-TH), true clearance
10.1.1 The parameters of new tapered thread working plug gauges and thread calibration plug gauges should be directly tested. The main measurement items are shown in Table 11. Table 11
Measurement items
Minor diameter and groove bottom shape
Pitch P
Thread half angle α/2
Base surface position tolerance T2
Basic length of gauge Lo
Measurement position
At the reference surface
At the reference surface
Within the entire thread length
Any thread
Within the entire thread length
Measurement Measuring instruments
Length gauge, gauge block, measuring needle
Length gauge, three-needle
Universal tool microscope
Universal tool microscope, pitch gauge
Universal tool microscope
Sine gauge, gauge block, dry comparator, level 1 flat plate depth micrometer, gauge block, micrometer comparator, level 1 flat plate outside micrometer
Newly made tapered thread working ring gauge should be directly tested for the following parameters. The test items are shown in Table 12. Table 12
Measurement items
Pitch P
Pitch taper
Effective pitch diameter
Basic length L:
Ring gauge step T
Measurement location
Within the entire length of the thread
Within the entire length of the thread
Measuring instruments
Pitch gauge, length measuring instrument, three-coordinate measuring machine
Length measuring instrument, three-coordinate measuring machine, special sine gauge thread calibration plug gauge
Gauge block, dry comparator, level 1 plate||t t||When the depth micrometer, gauge block, micrometer comparator, and level 1 flat plate are used to detect the effective mean diameter of the thread working ring gauge, the thread calibration plug gauge is manually screwed into the inspected thread working ring gauge. The deviation between the base surface of the inspected thread working ring gauge and the base surface of the thread calibration plug gauge shall not exceed 0.1P, as shown in Figure 7. 461
JB/T10031—1999
Base surface of the inspected thread working ring gauge
Base surface of the calibration thread plug gauge
10.1.3 The surface roughness is compared and tested using a standard roughness sample. 10.1.4 The hardness is tested as close to the thread as possible on the end face of the gauge with a Vickers hardness tester. 10.2 Arbitration
Any ring gauge that has passed the inspection using any thread calibration plug gauge that meets the requirements of this standard shall be treated as qualified. 10.3 Wear inspection of thread gauges
10.3.1 Wear inspection of tapered thread plug gauges10.3.1.1 The tapered thread working plug gauge is inspected by direct measurement method. When the basic center diameter wear exceeds the value specified in Table 13, the plug gauge shall be scrapped.
The tapered thread calibration plug gauge is inspected by direct measurement method. The dimensions of each part shall be kept within the specified size range. Table 13
Size code
1/16:1/8
10.3.2 Wear inspection of tapered thread working ring gauge1/4;3/8
1/2:3/4
2 years~6
The wear of the tapered thread working ring gauge is inspected by a thread calibration plug gauge. The basic diameter of the calibration plug gauge used shall be one TR value smaller than the basic diameter of the thread ring gauge. If the thread calibration plug gauge is If the base surface enters the base surface of the ring gauge being tested and the distance between the two base surfaces exceeds the "A\ value specified in Table 14, the ring gauge should be scrapped. Size code
1/16;1/8
1/4;3/8
If the cross-section relative taper (1:16) of the tested thread working ring gauge has a 462
1/2;3/4
deviation of 4 (as shown in Figure 8), the distance between the base surface of the thread correction plug gauge and the base surface of the ring gauge exceeds the (TR-2△)X16+0.25P" value, and the ring gauge should be scrapped. Damaged thread ring gauge mid-diameter busbar
11 Marking and packaging
11.1 The thread gauge and product packaging box shall be marked with: a) manufacturer's name or registered trademark;
b) thread gauge code and size code;
taper 1:16
c) year of manufacture (it is not necessary to mark the product packaging box). 11.2 The thread gauge shall be treated with rust prevention before packaging and properly packaged. The product shall not be damaged during transportation due to poor packaging.
11.3 The thread gauge shall be accompanied by a product certificate after verification and proved to comply with the provisions of this standard. The product certificate shall have the standard number, gauge code, size code and year of manufacture of this standard. 4638 Thread gauges should be processed for stability. 9 Gauge size calculation formula
The calculation formulas for the major diameter, middle diameter and minor diameter on the reference plane of the thread gauge are shown in Table 10. 460
Ground gauge types
Full-thread taper thread
Working plug gauge
Truncate-thread taper screw
Thread working plug gauge
Full-thread taper thread
Working ring gauge
Truncate-thread taper screw
Thread working ring gauge
Thread calibration plug gauge
Basic size
JB/T 10031- 1999
(D+TPl.)1-2F,
10 Inspection of thread gauges
10.1 Inspection of new thread gauges
Basic size
Basic size
≤（D+2F2）, with clearance groove
For relevant dimensions and tolerances, see Table 4. Table 5 and Table 9d2-TR
（drTR·-TH), true clearance
10.1.1 The parameters of new tapered thread working plug gauges and thread calibration plug gauges should be directly tested. The main measurement items are shown in Table 11. Table 11
Measurement items
Minor diameter and groove bottom shape
Pitch P
Thread half angle α/2
Base surface position tolerance T2
Basic length of gauge Lo
Measurement position
At the reference surface
At the reference surface
Within the entire thread length
Any thread
Within the entire thread length
Measurement Measuring instruments
Length gauge, gauge block, measuring needle
Length gauge, three-needle
Universal tool microscope
Universal tool microscope, pitch gauge
Universal tool microscope
Sine gauge, gauge block, dry comparator, level 1 flat plate depth micrometer, gauge block, micrometer comparator, level 1 flat plate outside micrometer
Newly made tapered thread working ring gauge should be directly tested for the following parameters. The test items are shown in Table 12. Table 12
Measurement items
Pitch P
Pitch taper
Effective pitch diameter
Basic length L:
Ring gauge step T
Measurement location
Within the entire length of the thread
Within the entire length of the thread
Measuring instruments
Pitch gauge, length measuring instrument, three-coordinate measuring machine
Length measuring instrument, three-coordinate measuring machine, special sine gauge thread calibration plug gauge
Gauge block, dry comparator, level 1 plate||t t||When the depth micrometer, gauge block, micrometer comparator, and level 1 flat plate are used to detect the effective mean diameter of the thread working ring gauge, the thread calibration plug gauge is manually screwed into the inspected thread working ring gauge. The deviation between the base surface of the inspected thread working ring gauge and the base surface of the thread calibration plug gauge shall not exceed 0.1P, as shown in Figure 7. 461bzxZ.net
JB/T10031—1999
Base surface of the inspected thread working ring gauge
Base surface of the calibration thread plug gauge
10.1.3 The surface roughness is compared and tested using a standard roughness sample. 10.1.4 The hardness is tested as close to the thread as possible on the end face of the gauge with a Vickers hardness tester. 10.2 Arbitration
Any ring gauge that has passed the inspection using any thread calibration plug gauge that meets the requirements of this standard shall be treated as qualified. 10.3 Wear inspection of thread gauges
10.3.1 Wear inspection of tapered thread plug gauges10.3.1.1 The tapered thread working plug gauge is inspected by direct measurement method. When the basic center diameter wear exceeds the value specified in Table 13, the plug gauge shall be scrapped.
The tapered thread calibration plug gauge is inspected by direct measurement method. The dimensions of each part shall be kept within the specified size range. Table 13
Size code
1/16:1/8
10.3.2 Wear inspection of tapered thread working ring gauge1/4;3/8
1/2:3/4
2 years~6
The wear of the tapered thread working ring gauge is inspected by a thread calibration plug gauge. The basic diameter of the calibration plug gauge used shall be one TR value smaller than the basic diameter of the thread ring gauge. If the thread calibration plug gauge is If the base surface enters the base surface of the ring gauge being tested and the distance between the two base surfaces exceeds the "A\ value specified in Table 14, the ring gauge should be scrapped. Size code
1/16;1/8
1/4;3/8
If the cross-section relative taper (1:16) of the tested thread working ring gauge has a 462
1/2;3/4
deviation of 4 (as shown in Figure 8), the distance between the base surface of the thread correction plug gauge and the base surface of the ring gauge exceeds the (TR-2△)X16+0.25P" value, and the ring gauge should be scrapped. Damaged thread ring gauge mid-diameter busbar
11 Marking and packaging
11.1 The thread gauge and product packaging box shall be marked with: a) manufacturer's name or registered trademark;
b) thread gauge code and size code;
taper 1:16
c) year of manufacture (the product packaging box may not be marked). 11.2 The thread gauge shall be treated with rust prevention before packaging and properly packaged. The product shall not be damaged during transportation due to poor packaging.
11.3 The thread gauge shall be accompanied by a product certificate after verification and proved to comply with the provisions of this standard. The product certificate shall have the standard number, gauge code, size code and year of manufacture of this standard. 4638 Thread gauges should be processed for stability. 9 Gauge size calculation formula
The calculation formulas for the major diameter, middle diameter and minor diameter on the reference plane of the thread gauge are shown in Table 10. 460
Ground gauge types
Full-thread taper thread
Working plug gauge
Truncate-thread taper screw
Thread working plug gauge
Full-thread taper thread
Working ring gauge
Truncate-thread taper screw
Thread working ring gauge
Thread calibration plug gauge
Basic size
JB/T 10031- 1999
(D+TPl.)1-2F,
10 Inspection of thread gauges
10.1 Inspection of new thread gauges
Basic size
Basic size
≤（D+2F2）, with clearance groove
For relevant dimensions and tolerances, see Table 4. Table 5 and Table 9d2-TR
（drTR·-TH), true clearance
10.1.1 The parameters of new tapered thread working plug gauges and thread calibration plug gauges should be directly tested. The main measurement items are shown in Table 11. Table 11
Measurement items
Minor diameter and groove bottom shape
Pitch P
Thread half angle α/2
Base surface position tolerance T2
Basic length of gauge Lo
Measurement position
At the reference surface
At the reference surface
Within the entire thread length
Any thread
Within the entire thread length
Measurement Measuring instruments
Length gauge, gauge block, measuring needle
Length gauge, three-needle
Universal tool microscope
Universal tool microscope, pitch gauge
Universal tool microscope
Sine gauge, gauge block, dry comparator, level 1 flat plate depth micrometer, gauge block, micrometer comparator, level 1 flat plate outside micrometer
Newly made tapered thread working ring gauge should be directly tested for the following parameters. The test items are shown in Table 12. Table 12
Measurement items
Pitch P
Pitch taper
Effective pitch diameter
Basic length L:
Ring gauge step T
Measurement location
Within the entire length of the thread
Within the entire length of the thread
Measuring instruments
Pitch gauge, length measuring instrument, three-coordinate measuring machine
Length measuring instrument, three-coordinate measuring machine, special sine gauge thread calibration plug gauge
Gauge block, dry comparator, level 1 plate||t t||When the depth micrometer, gauge block, micrometer comparator, and level 1 flat plate are used to detect the effective mean diameter of the thread working ring gauge, the thread calibration plug gauge is manually screwed into the inspected thread working ring gauge. The deviation between the base surface of the inspected thread working ring gauge and the base surface of the thread calibration plug gauge shall not exceed 0.1P, as shown in Figure 7. 461
JB/T10031—1999
Base surface of the inspected thread working ring gauge
Base surface of the calibration thread plug gauge
10.1.3 The surface roughness is compared and tested using a standard roughness sample. 10.1.4 The hardness is tested as close to the thread as possible on the end face of the gauge with a Vickers hardness tester. 10.2 Arbitration
Any ring gauge that has passed the inspection using any thread calibration plug gauge that meets the requirements of this standard shall be treated as qualified. 10.3 Wear inspection of thread gauges
10.3.1 Wear inspection of tapered thread plug gauges10.3.1.1 The tapered thread working plug gauge is inspected by direct measurement method. When the basic center diameter wear exceeds the value specified in Table 13, the plug gauge shall be scrapped.
The tapered thread calibration plug gauge is inspected by direct measurement method. The dimensions of each part shall be kept within the specified size range. Table 13
Size code
1/16:1/8
10.3.2 Wear inspection of tapered thread working ring gauge1/4;3/8
1/2:3/4
2 years~6
The wear of the tapered thread working ring gauge is inspected by a thread calibration plug gauge. The basic diameter of the calibration plug gauge used shall be one TR value smaller than the basic diameter of the thread ring gauge. If the thread calibration plug gauge is If the base surface enters the base surface of the ring gauge being tested and the distance between the two base surfaces exceeds the "A\ value specified in Table 14, the ring gauge should be scrapped. Size code
1/16;1/8
1/4;3/8
If the cross-section relative taper (1:16) of the tested thread working ring gauge has a 462
1/2;3/4
deviation of 4 (as shown in Figure 8), the distance between the base surface of the thread correction plug gauge and the base surface of the ring gauge exceeds the (TR-2△)X16+0.25P" value, and the ring gauge should be scrapped. Damaged thread ring gauge mid-diameter busbar
11 Marking and packaging
11.1 The thread gauge and product packaging box shall be marked with: a) manufacturer's name or registered trademark;
b) thread gauge code and size code;
taper 1:16
c) year of manufacture (the product packaging box may not be marked). 11.2 The thread gauge shall be treated with rust prevention before packaging and properly packaged. The product shall not be damaged during transportation due to poor packaging.
11.3 The thread gauge shall be accompanied by a product certificate after verification and proved to comply with the provisions of this standard. The product certificate shall have the standard number, gauge code, size code and year of manufacture of this standard. 4631 The working plug gauge of the tapered thread is tested by direct measurement method. When the wear of its basic center diameter exceeds the value specified in Table 13, the plug gauge shall be scrapped.
The tapered thread calibration plug gauge is tested by direct measurement method. The dimensions of its various parts shall be kept within the specified dimension range. Table 13
Size code
1/16:1/8
10.3.2 Wear inspection of tapered thread working ring gauge1/4;3/8
1/2:3/4
2 years~6
The wear of the tapered thread working ring gauge is tested by a thread calibration plug gauge. The basic diameter of the calibration plug gauge used shall be one TR value smaller than the basic diameter of the thread ring gauge. If the thread calibration plug gauge is If the base surface enters the base surface of the ring gauge being tested and the distance between the two base surfaces exceeds the "A\ value specified in Table 14, the ring gauge should be scrapped. Size code
1/16;1/8
1/4;3/8
If the cross-section relative taper (1:16) of the tested thread working ring gauge has a 462
1/2;3/4
deviation of 4 (as shown in Figure 8), the distance between the base surface of the thread correction plug gauge and the base surface of the ring gauge exceeds the (TR-2△)X16+0.25P" value, and the ring gauge should be scrapped. Damaged thread ring gauge mid-diameter busbar
11 Marking and packaging
11.1 The thread gauge and product packaging box shall be marked with: a) manufacturer's name or registered trademark;
b) thread gauge code and size code;
taper 1:16
c) year of manufacture (the product packaging box may not be marked). 11.2 The thread gauge shall be treated with rust prevention before packaging and properly packaged. The product shall not be damaged during transportation due to poor packaging.
11.3 The thread gauge shall be accompanied by a product certificate after verification and proved to comply with the provisions of this standard. The product certificate shall have the standard number, gauge code, size code and year of manufacture of this standard. 4631 The working plug gauge of the tapered thread is tested by direct measurement method. When the wear of its basic center diameter exceeds the value specified in Table 13, the plug gauge shall be scrapped.
The tapered thread calibration plug gauge is tested by direct measurement method. The dimensions of its various parts shall be kept within the specified dimension range. Table 13
Size code
1/16:1/8
10.3.2 Wear inspection of tapered thread working ring gauge1/4;3/8
1/2:3/4
2 years~6
The wear of the tapered thread working ring gauge is tested by a thread calibration plug gauge. The basic diameter of the calibration plug gauge used shall be one TR value smaller than the basic diameter of the thread ring gauge. If the thread calibration plug gauge is If the base surface enters the base surface of the ring gauge being tested and the distance between the two base surfaces exceeds the "A\ value specified in Table 14, the ring gauge should be scrapped. Size code
1/16;1/8
1/4;3/8
If the cross-section relative taper (1:16) of the tested thread working ring gauge has a 462
1/2;3/4
deviation of 4 (as shown in Figure 8), the distance between the base surface of the thread correction plug gauge and the base surface of the ring gauge exceeds the (TR-2△)X16+0.25P" value, and the ring gauge should be scrapped. Damaged thread ring gauge mid-diameter busbar
11 Marking and packaging
11.1 The thread gauge and product packaging box shall be marked with: a) manufacturer's name or registered trademark;
b) thread gauge code and size code;
taper 1:16
c) year of manufacture (the product packaging box may not be marked). 11.2 The thread gauge shall be treated with rust prevention before packaging and properly packaged. The product shall not be damaged during transportation due to poor packaging.
11.3 The thread gauge shall be accompanied by a product certificate after verification and proved to comply with the provisions of this standard. The product certificate shall have the standard number, gauge code, size code and year of manufacture of this standard. 463
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