JB/T 9994-1999 This standard is a revision of ZB J41 011-89 "55° cylindrical pipe thread taps". During the revision, the performance test chapter was deleted, and editorial modifications were made according to 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 conical pipe threads". This standard specifies the type and size, technical requirements, marking and basic requirements for packaging of 55° cylindrical pipe threads, and gives the length dimension calculation instructions for 55° cylindrical pipe thread taps (hereinafter referred to as taps) in Appendix A (suggestive appendix). . This standard is applicable to the processing of 55° cylindrical pipe thread taps. This standard is divided into three types of taps: G series, GD series and Rp series. G series and GD series taps are suitable for machining pipe threads without thread seals (according to GB/T 7307-1987 "Pipe threads without thread seals"), and Rp series taps are suitable for machining pipe threads with thread seals (according to GB/T 7306-1987 "Pipe threads with thread seals"). This standard was first issued on . JB/T 9994-1999 55° cylindrical pipe thread taps JB/T9994-1999 Standard download decompression password: www.bzxz.net

1C5 25.10.50
Machinery Industry Standard of the People's Republic of China
JB/T9994—1999
55° Cylindrical Pipe Thread Taps
Published on 1999-05-20
National Machinery Industry Bureau
Implementation on 20-01-01
JBT9994-1999
This standard is a revision of ZBJ41011-89 "55° Cylindrical Pipe Thread Taps" dated July 14, 2001. During the revision, except for the performance test chapter, editorial revisions were made in accordance with relevant regulations. Other technical requirements were changed to the original standard and the international standard ESO2284-1987 was adopted for dimensions and marks of round and round vascular screw threads. This standard replaces ZBJ41011-89 from the date of implementation. Appendix A of this standard is a suggestive appendix.
This standard is proposed and supervised by the National Standardization Technical Committee of the People's Republic of China. The responsible drafting unit of this standard is Chengdu Tool Research Institute. The drafters of this standard are: Jiang Tigui, Ban Zhen, Che Shusheng, Yi Hongze, Yu, 1 Scope
Machinery Industry Standard of the People's Republic of China
55° Round Pipe Thread Taps
JE/T9994-190
2002 J411-59
This standard specifies the type and size, technical requirements and basic requirements for marking and packaging of 55° cylindrical pipe thread taps, and gives the calculation instructions for the length and size of 55° cylindrical thread taps (hereinafter referred to as thread taps) in Appendix A (informative appendix). This standard is applicable to the taps of 55° cylindrical pipe threads, including the standard centrifugal series, GD series and RP series = types of pliers. The wire chains of the series and GL series are suitable for processing non-threaded pipe threads (standard 0B?30?198T non-combustible curved thread); the wire chains of the series 3Rp are suitable for the general thread of the threaded seal of the Dingjia thread [connection GBT73061987 pipe thread sealed with threaded seal]. Reference standards
The provisions contained in the following standards constitute the provisions of this standard by citing them in the blank standard: When this standard is published, the versions shown are valid: All standards will be statically revised so that all parties to this standard can discuss and use The following standards are used for the possibility of new versions: 3BT73061987 Thread effect porcelain pipe type
GB.T73071987 Non-frequency corrugated pipe velvet JB9995199955° ring column pipe petal thread tap thread tolerance type and size
3.1 The type of tap is shown in Figure 1, and the size is given in Table 1. Figure
Approved by the National Machinery Industry Bureau on 10-5-2
2000-01-01 implementation
(G2 D)
Bacteria white grid
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Note: The size within the good iswwW.bzxz.Net
JB/T9994-1999
The recommended cutting taper length for single and leather group taps is given in Table 2. 3. 2
Single and group (equal diameter) parts
Cutting length
7~10 teeth
Single point group (equal diameter wire pin
and group (unequal) wire class
First phase
Second phase
IRT9994-1999
Table (complete)
Visit sample length 1,
1~3 teeth
[~3 teeth
One pitch is less than or equal to! 814rmni with a cone, worry about the award for a single. Single according to the production and supply of 2 sets of wire hooks. According to user needs and the manufacturer's own provisions. Two
3 sets of unequal diameters are staggered, in the first, second year twisting and cutting of the test to save 1, 2 round or with the serial number Cup mark for identification 3.3 Marking example
Pipe thread, code 0IA, single tap is marked as: 55° round pipe thread tap G1/4JB/T9994-1999 Female thread, code G14, single tap is marked as 55* cylindrical pipe thread tap G1/4-LHJB/T9994.1999 Pipe thread, code △1/4D, single tap is marked as: SS circular pipe thread tap G1/4DJB/T99941999 Pipe thread, code Rp1, single tap is marked as: 55* rigid pipe thread tap Rp1/4B/T9994-1999 Pipe thread, code 1/2, two taps in a group of unequal diameters are marked as 55° cylindrical pipe thread tap G1/4-G1.2JB/T9994-19 993.4 The nominal cutting angle of the taps produced by the group is required in the radial plane, and its value is as follows: front angle, 8-105, dead angle 4, 4°-6%. 4 Technical requirements 4.1 The thread surface shall not have cracks, blade, rust, grinding and burns, etc. that affect the performance. 4.2 The thread surface is given in Table 3, the thread surface is in accordance with the short-circuit value of B/T9994-1999. The calibration part should be checked at the starting point. 4.3 The thread tooth type (medium diameter and small stable diameter) ）The thread diameter should be within the specified range. 4.4
4.5 The tolerance of each part is as follows: Total length L: h16
Threaded part length:
Diameter of the end: h9
Square head size α: h17 (including shape and position tolerance) 1.6 The position tolerance of the thread is given in Table 4. The part of the thread is made of W6Mn5Cr4V2 or other steel with equivalent performance, and the shank is made of 60 steel or other steel with equivalent performance.
4.8 The hardness of the threaded part of the screw pin is 63-664HC, and the hardness of the tapping head is not less than 3RC. 5 Marking and packaging
5.1 Marking
5. 1.1 The product should be marked with:
a) Manufacturer or seller’s trademark;
h) Thread code:
c) Material code:
5.1.1 The package box should be marked with:
a) Manufacturer or seller’s name;
b) Tap mark:
e) Material code or brand;
d) Number of pieces:
e) Year and month of manufacturing
5.2 Packaging
The screw thread should be processed by the French union before packaging. The gas packaging must be firm and prevent damage during transportation. JB/T9994-1999
Appendix A
[Reminder Appendix]
Instructions for calculating the length of taps
This appendix is ​​equivalent to S022B4-.1987 (Appendix for thread length and marking of column and pipe screws). The dimensions listed at the end of this standard are not included. If they are used, the formula in this appendix is ​​used to calculate the true length of the thread. The formula for calculating the true length of the thread (A [)：I-SP+3.08dvR
Wherein: 3P—cut chain length:
A2 shank length
proof length,
shank length calculation formula I (A2:
seed length = 6.3d°45+1042+1
or: 6.3g0m——from length:
Note, from length refers to the length outside the silk head. lode\-
selling length:
good head length.
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