This standard specifies the technical specifications for the size and position tolerance, appearance and surface roughness, material and hardness, performance test and marking, and packaging 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 8364.3-1996 Technical Specifications for 60° Tapered Pipe Thread Taps JB/T8364.3-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 8364.3-96
60° Taper Pipe Thread Tap
Technical Specification
1996-04-22 Issued
The Ministry of Machinery Industry of the People's Republic of China Issued and Implemented on 1996-07-01
JE/I 8364.3-96
Appendix A of this standard is the standard attachment.
This standard is proposed and managed by the National Tool Standardization Technical Committee, and the responsible initiators are Shanghai Cutting Tools and Chengdu Tool Research Institute. The main drafters of this standard are Gu Bupao, Wang Yongfeng, Yao Tigong, Ming Jin and Yan. This standard was first issued on April 22, 1996 and implemented on July 1, 1996. 1 Scope
Machinery Industry Standard of the People's Republic of China
60° Taper Pipe Thread Taps
Technical Specifications
JB/T8364.3-96
This standard specifies the size and setting tolerance, appearance and surface conditions, material and hardness, performance test and marking, and packaging technical specifications of 0\China maintenance pipe thread taps.
This standard is applicable to the processing of 60° tapered pipe end (NPT) with thread size code of 1/15~2. 2 Standards
The following standards contain the texts which are quoted in this standard and are the provisions of this standard. When this standard is published, the texts shown are valid. All standards may be revised. The parties using this standard should explore the possibility of using the latest version of the following standards. GB/14438SL·AN Enterprise Consumption Standards 3 Dimension and Position Tolerances
3. Dimension tolerances shall be in accordance with the provisions of Table 1.
Table dimensional tolerancesbzxz.net
The diameter of the female tree is d
The head is inch.
The position tolerance shall be as specified in Table 2,
Table position tolerance
1/16~-1/2
4Outer smoke and surface roughness
The four-axis dynamic
h12 (including shape product tolerance) of the cutting part on the common axis
The radial dynamic
tap surface of the calibration part on the common axis
shall not have cracks, edges, rust, close cutting burns and other defects that affect the performance. E
4.2 The upper limit of the surface roughness shall be in accordance with the provisions of Table 3, and the inspection items of the Ministry of Industry and Commerce for the public shaft are implemented in 1996-1996. 4.3 The thread profile of the threaded screw shall be polished. 5 Materials and Surface Ratios FB/T 8364. 3-06 The upper limit of the surface roughness of the threaded screw shall be in accordance with the provisions of Table 3, and the ... These taps are made of steel with a performance of 45°C or above. The hardness of alloy tool steel is not less than 1TIRC. High-speed steel is not less than 63TIRC. The hardness is not less than 30HRC. The taps produced in batches should be sampled for cutting performance. 5.1 Test conditions. 1.1 Machine tool: The test machine tool adopts a machine tool that meets the accuracy requirements. 61.2. The sample size is 5N. 6.1.3 The material of the test is 45 steel with a hardness of 170~200IIB. 6.1.4 The form of the thread pattern is 1.16. Cutting specifications shall be as per the provisions of Table 4. Cutting shall be carried out with emulsified water-based liquid for tapping and with full-efficiency oil for hand tapping (as per the provisions of GB/T443). 6.1.6
Table 4 Cutting specifications
1/16~1/2
Evaluation of test results
Initial cutting speed
Thickness of thread (not less than)
Number of holes to be changed
The thread after testing shall not have any signs of edge and sharp damage, and shall maintain its original usability. The thread effect accuracy of the cut test piece shall comply with the requirements of NPT (NPT), and the upper limit of thread surface roughness is R, 25μm. 1 piece does not meet the above requirements and this batch of wire is judged to have failed the performance test. 7 Marking and packaging 3.1 Marking 7.1.1 Taps should be marked: a) manufacturer’s trademark; 6) thread number; material code (some taps made of high-speed steel shall be marked [SS; taps made of alloy may not be marked) 2. 7..2 The packaging box should be marked with: b) manufacturer’s name and address of the trademark department; c) material brand or code; d) number of pieces; e) imported parts.
JET8364.3—96
Tap should be processed by drawing before packing, and the packing must be smooth and can prevent damage during transportation. 3
JB/T8364.3—96
Tolerance standard of top height and bottom height of taper screw
A1 Tolerance of top height and bottom height of taper thread can be found in A1 and Table AI.
Tolerance of top height and bottom height of taper thread (or thread height)
Tolerance of top height and bottom height of taper thread (or thread height)
Note: The text in the station number refers to the internal effect. The tolerance of top height and bottom height of taper thread can be found in A1 and Table AI. In actual production, the top and bottom of the threaded thread with a tolerance of 2F.4mm are generally round and elongated. The top and bottom of the threaded thread ...
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