This standard specifies the type and size of 60° tapered pipe thread taps. This standard is applicable to taps for machining 60° tapered pipe threads (NPT) with thread size codes of 1/16~2. JB/T 8364.2-1996 60° tapered pipe thread taps JB/T8364.2-1996 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 8364.2-96
60° Taper Pipe Thread Tap
1996-04-22 Issued
Ministry of Machinery Industry of the People's Republic of China
1996-07-01 Implementation
JB,/T 8364, 2—
This standard is formulated based on the relevant parts of NPT in the 1987 edition of the United States National Standard for Design and Grinding of Wire Meshes, and is equivalent to the standard in terms of type and size.
When converting the United States standard into this standard, the basic dimensions are extensively customized in combination with my country's national conditions, among which the head and shank dimensions of the wire chain refer to GB4267B1 Shank diameter and transmission square head dimensions for straight shank rotary tools 2. Appendix A and Appendix B of this standard are appendices recommended by the Ministry of Standardization. This standard was proposed and issued by the National Technical Committee for Tool Standardization. The original units of the standard are Shanghai Cutting Tool Factory, Shanghai Machinery Industry Corporation, and Ministry of Tool Research Institute. The main drafters of this standard are Xinxiao, Qinxun, Xialinshi, and Yu Jin. This standard was first issued on April 23, 1996. This standard is effective from July 1, 1996. Scope
Machinery Industry Standard of the People's Republic of China
60 Taper Pipe Thread Taps
Technical standard specifies the type and size of 60 taper pipe thread JB/T 834.2 -- G
This standard is applicable to the taps for machining 60- taper pipe thread (NPT) with thread size code of 1/16~2.2.2.1 The type and size of the taps are as shown in Figure 1 and Table 1. The basic size of the thread is approved by the Ministry of Machinery Industry on 1996-0+22. The only missing size is 1996-07-01. Every 25.4mm inner front tooth teaching JBT8364.296 (complete table) The final tooth shape and size of the thread shall be in accordance with the provisions of Figure 2 and Table 2. The parallelism of the center and center of the surface shall be noted. The thread shape and tooth distance are allowed to be consistent, but the position of the thread shall not exceed the effective limit of the thread shape [see the appendix standard for details]. Figure 2 Butterfly tooth type of silk candy
Table 2 Number of sub-divided by the thread diameter of silk male
941337
2.3 Marking example
.d. 079
60° round vascular spiral, code NTT1/4 tap: medium thread
burst flower deviation
(35.4m upper
tooth type half and
stop difference/2
±center.c76±e 0127
cone celebration public responsibility
+ 26°49°
-1753-
upper e'ser
JB/T 364. 296
60\back thread NPT174
JR/T8364.2-96
60° constant cone arm screw, code NPT1/4, standard: 60° web laying pipe screw NPT1/4-LJB/T8364.296JB/T 8364.2-96
Appendix A
Tolerances of the top height and bottom height of the solid cone pipe (Appendix to the standard)
A1 The tolerances of the top height and bottom height of the rigid pipe are shown in Figure AI and Table A1) (Tolerances of the height of the finished pipe (finished tooth)
Method: The intersection of the numbers is for the inner thread. Figure A1
Figure A1
Tolerance of the new thread height of the cone
Tolerance of the thread height and the bottom of the thread
Number of end threads within 2F.4mm
A2 In actual production, the thread tip and the bottom of the thread are generally in the shape of an arc. 2.1 It is allowed that the thread tip of the screw tip is outside the thread tip tolerance zone, but the top of the thread tip cannot leave the thread tip tolerance zone, see Figure A? Z, 2 The arc of the tooth bottom cannot exceed the tooth bottom radius, see Figure A2. Figure A2 Rounding of internal thread top and bottom JB/T B364. 296 Appendix B Basic dimensions and element deviations of American pipe threads (Standard Appendix) The effective basic dimensions of American tapered pipe threads are shown in Table B1. The basic tooth shape of the B1 cone tube spider is based on the basic diameter standard of the large diameter standard. The main deviation of the 51-592 screw is shown in Table 2. The tooth shape half angle of the medium and small screws is shown in Table 2. The tooth shape half angle of the round silver half angle and the limit difference of the screw are within 25.4mm. The tooth shape angle difference is not a certain degree. +26°19hwwW.bzxz.Net
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The reference height is (25, above)
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