JB/T 9996-1999 This standard is a revision of ZB J41 013-89 "55° Taper Pipe Thread Taps". During the revision, the performance test chapter was deleted, and editorial changes were made in accordance with relevant regulations. Other technical contents remained unchanged. The original standard non-equivalently adopted the international standard ISO 2284-1987 "General Dimensions and Markings for Hand Taps for Cylindrical and Taper Pipe Threads". This standard specifies the type and size, tooth profile size and deviation, technical requirements, marking and basic requirements for packaging of 55° tapered pipe thread taps (hereinafter referred to as taps). Appendix A (Standard Appendix) gives the total length and reference distance dimensions of Rc series taps. This standard applies to taps for processing pipe threads for threaded seals (according to GB/T 7306-1987 "Pipe threads for threaded seals"). This standard was first published on the date of the year. JB/T 9996-1999 55° tapered pipe thread tap JB/T9996-1999 Standard download decompression password: www.bzxz.net

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Standard of the Machinery Industry of the People's Republic of China
JB/F9996—1999
55° Taper Pipe Thread Tap
Published on May 20, 1999
National Bureau of Machinery Industry
Implementation on January 1, 2000
JBT9996-1999
This standard records the revision of ZBJ41013-8955-Taperature Test of Threaded Wire Chains, except for the chapter of performance test, and has made editorial changes according to relevant regulations, and its technical content has changed. The original standard adopts the international standard 1IS02284-1987 "Testing and Testing of Threaded Wire Chains for Hand Use-General Dimensions and Markings". This standard replaces ZBJ41013-89 from the date of implementation, and Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Military Standardization Technical Committee. The responsible drafting unit of this standard is Chengdu Tool Research Institute. The main drafters of this standard are: Qie Ti Ji, Li Gu, Ban Shizhen, Shan Hongyi, Xia Qianbowei
Machinery Industry Standard of the People's Republic of China
55 Taper Pipe Thread Taps
J8/T9996-199
The standard specifies the types and sizes, thread sizes and deviations, technical requirements, marking and other basic requirements for packaging of 35\T9996-199 tapers (hereinafter referred to as tapers), and gives the overall length and reference distance dimensions of Ko series taps in Appendix A (Appendix to the standard).
This standard is applicable to the processing of pipe threads for processing sealed pipe threads (according to GB 2706-198 standard for compressed air pipe threads). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all in force. All standards will be revised. All parties using this standard shall discuss the possibility of using the new version of the following standards. GB/T7306-1987 3 Types and sizes of taps for use with convergent threads 3.1 Types and sizes of taps are shown in Figure 1. The sizes are given in Table 1. Approved by the National Machinery Industry Bureau on May 20, 1999, and implemented on January 1, 2000 Note: , is the size.
JB/T9996-1999
33 The thread profile of the thread mill is shown in Figure 2, and the size limit difference is given by:
Base diameter
7.723 7.142
9.72819.147
13 157 02.361 11,445
20 955
15.8614.950
19.79318.631www.bzxz.net
25.279 24.117
T3 705
72 226
86.40584.926
100.33098851
97 372
133.030 11 1.551110 072
3.3 Identification example
The pipe screw is longer, the code Rc is marked as: -199
0.12.1n.291
0.[840.428
0.317!0.740
55° saw thread wire Rc%JB/T9995-1999 pipe end thread code Kc, left-hand thread is marked as: 55 saw thread wire Rc- LHB9619
4 Technical requirements
Screw deviation
4.1 The surface of the thread shall not have defects such as rate lines, nests, traces and side cutting that affect the compression performance. 4.2 The surface roughness of the thread is given in Table 3.
Surface roughness
Surface roughness
Surface roughness
4.3 The thread tooth type (middle diameter and minor diameter) shall be compensated. The width difference
is within 16mg
Surface roughness
4.4 The small tolerance of the thread size is determined as follows: Total length
Thread length
Thread shank diameter
Square head size
dj: h9
JB/T9996-1999
a: h12 (including shape and position tolerances) 4.5 The position tolerances of the taps are given in Table 4. Table 4
Diameter tolerances of the taps to the common axis
Diameter tolerances of the taps to the common axis
4.6 The threaded portion of the tap is made of W6Mo5Cr4V2 or other high-speed tool steel with equivalent properties, and the welding shank is made of 60 steel or other materials with equivalent properties:
4, the hardness of the tap screw part is 63-66IIRC, and the hardness of the thread head is not less than 30HR. Marking and packaging
5,.1 5.1.1 Product markings: a) manufacturer or seller’s trademark; b) thread code; c) material code. 5.1.2 The packaging container shall be marked with: b) manufacturer or seller’s name, trademark; c) thread code; d) thread mark; e) material code and brand; d) number of pieces; e) year and month of manufacture. Threads shall be treated with rust-proofing before packaging. The packaging must be solid and prevented from being damaged during transportation. 4
JA/T999G-1999
(Appendix to the standard)
About the dimensions of the total length and reference distance of R series wires A1R-R1 round duct wire total length and reference distance 1, dimensions, according to the requirements of potential use, can be in accordance with the provisions in Table AI, Al
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