JB/T 3326-1999 JB/T 3326-1999 Measuring needle JB/T3326-1999 Standard download decompression password: www.bzxz.net

ICS25.060.20
Standard of the Machinery Industry of the People's Republic of China
JB/T3326—1999
Bargauge
Published on May 20, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T3326—1999
This standard is revised on the basis of JB3326-83 "Bargauge". The technical content of this standard is consistent with that of JB3326-83, and it has only been re-edited according to relevant regulations. Appendix A of this standard is a reminder appendix.
This standard replaces JB3326-83 from the date of implementation. 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: Harbin Measuring Tools and Cutting Tools Factory. This standard was first published as GL1162 in 1962 and revised for the first time in July 1983. 1
Mechanical Industry Standard of the People's Republic of China
Bargauge
JB/T3326-1999
Replaces JB332683
This standard specifies the type and size, technical requirements, marking and packaging of gauges with accuracy levels of 0 and 1. This standard applies to gauges used to test the pitch diameter of threads. Definitions
This standard adopts the following definitions.
2.1 Gauge
A needle-shaped measuring instrument with a certain nominal diameter for measuring the pitch diameter of threads by the indirect method. 3 Types and sizes
The type of gauge is shown in Figure 1.
Approved by the State Machinery Industry Bureau on May 20, 1999 4
b) Type I
Figure 1 Measuring needle
Implementation on January 1, 2000
The basic dimensions of the measuring needle are specified in Table 1.
Type of measuring needle
JB/T3326-1999
e) Type III
Figure 1 (end)
Nominal diameter D
Technical requirements
Type of measuring needle
JB/T3326—1999
Table 1 (end)
Nominal diameter D
The measuring needle should be made of carbon tool steel T12A or alloy tool steel GCr15, Cr, CMn and other materials. The hardness of the measuring surface of the measuring needle shall not be less than 60HRC, and the maximum allowable value of the surface roughness R is 0.04μm. b
For the dimensional deviation, roundness tolerance, taper tolerance and generatrix straightness tolerance of the nominal diameter D of the measuring needle, please refer to the provisions of Table 2. Table 2
Accuracy grade
Nominal diameter D
0.118-6212
Dimensional deviation
Roundness tolerance A
Taper tolerance
Within the deviation range of diameter D
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance and generatrix straightness tolerance are not calculated. 4.4 The measuring needles shall be supplied in groups, with 3 measuring needles in each group. The straightness tolerance B of the busbar is not greater than 1um over a length of 8mm. 4.5 Each set of measuring needles should be equipped with a plate for hanging measuring needles. The plate should be made of steel or aluminum. There should be a hole of not less than Φ3mm on the plate and the distance from the center of the hole to the middle of the working part of the measuring needle is about 70mm. 5 Marking and packaging The plate for hanging measuring needles should be marked with: a) manufacturer's name or registered trademark; b) nominal diameter; c) accuracy grade. 2 The packaging box of measuring needles should be marked with: a) manufacturer's name or registered trademark; b) nominal diameter; c) accuracy grade.
JB/T3326—1999
The measuring needles shall be treated with rust prevention and properly packed before packaging. The products shall not be damaged during transportation due to poor packaging. 5.3
5.4 Each set of measuring needles that have been verified to meet the requirements of this standard shall be accompanied by a product certificate, which shall have the standard number and factory date of this standard.
JB/T3326-1999
Appendix A
(Reminder Appendix)
Choice of measuring needle
When measuring the thread pitch diameter with a measuring needle,
it is recommended to select a measuring needle with the corresponding nominal diameter according to Table A1 according to the pitch of the measured thread Table A1bZxz.net
Measuring needle diameter
Measuring needle type
Applicable pitch
Inch ( Threads per inch)
Gage needle diameter
Gage needle type
Type II
JB/T3326—1999
Table A1 (Complete)
Applicable pitch
Inch (threads per inch)
1Select the diameter of the gauge needle according to Table A1. When measuring the pitch diameter of a single-start thread, except for those marked with "*", due to the deviation of the thread profile half angle The measurement error is very small and can be ignored.
2 When the measuring needle is used to measure the middle diameter of the trapezoidal thread and the measuring needle surface is lower than the outer diameter of the thread and the middle diameter of the through-end trapezoidal thread plug gauge is measured, the measuring needle should be selected according to the corresponding pitch with "*". At this time, the influence of the tooth profile half-angle deviation on the measurement result must be taken into account. 6
Mechanical Industry Standard
JBT3326-1999
Published and distributed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing: Postal Code 100044)*
Book size 880×12301/16 Printing sheet 3/4 Number of words 14000 First printing in August 1999
First edition in August 1999
Print number 1-500
Price 1000 yuan
99-429
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