JB/T 8824.3-1998 Technical requirements for unified thread taps

This standard specifies the technical requirements for the dimensions, materials and hardness, appearance and surface roughness, marking and packaging of unified thread taps (hereinafter referred to as taps) and unified thread nut taps (hereinafter referred to as nut taps). This standard applies to taps and nut taps produced in accordance with JB/T 8824.1 and JB/T 8824.4. JB/T 8824.3-1998 Technical conditions for unified thread taps JB/T8824.3-1998 Standard download decompression password: www.bzxz.net

1CS 25.100.50
Mechanical Industry Standard of the People's Republic of China
JB/T 8824.3-1998
Technical specification for unified threads taps1998-12-29 Issued by
National Bureau of Machinery Industry
1999-07-1Implementation
JB/T8824.3—1998
This standard corresponds to the American standard ANSIB94.9-1987 (cutting and grinding wire). This standard was first issued on December 29, 1998. This standard was proposed and managed by the National Technical Committee for Tool Standardization. The main drafting unit of this standard is Shanghai Cutting Tool Factory. Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Unified Thread Taps
Technical Conditions for Unified Thread Taps tapsJB/TB824.3—199m
This standard specifies the technical requirements for dimensions, materials, hardness, outer and surface roughness, marking and packaging of unified auxiliary thread taps (hereinafter referred to as taps) and unified flame thread nut ferrules (hereinafter referred to as nut taps). This standard is applicable to taps and nut taps produced in accordance with JBT8824.1 and JB/T8824.4. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of edition of this standard, the versions shown are valid. All standard departments will be revised. Each party using this standard should explore the possibility of using the latest versions of the following standards. JB/T8824.1...1998 Unified flame thread taps JB/T8824.2—1998 Standard—Thread dimensions and thread tolerances 8/T24.41998 Standard—Screw nut thread dimensions
3 Sizes
3. Thread and The effective tooth type and size limit of the mother wire shall be determined according to JB/T8824.2. 3.2 Cutting and cutting wire: Check the middle diameter at the starting point of the calibration part (when the starting point of the calibration part of the cut wire is less than 4 teeth from the front end, the middle diameter is checked at 4 teeth from the front end. The nut wire is checked at the point where it moves 1-2 teeth from the midpoint of the cutting part to the calibration part. 3.3 The tolerances of the shank diameter of the wire and the square head of the nut wire are given in Tables 1 and 2. Cutting
National Bureau of Machinery Industry 19 98-12-29 approved
14-2/5
34-1 years
No.-No.12
Department of Habitat
1999-07-01 implementation
No.0--No.12
1/4-1/2
JB/T8824.3-1998
The symmetry of the square head to the shank axis is given in Table 3. Table 3
Symmetry
No.0-No.12.1/4~1/2
Square head length
9/16-2
The tolerance of the thread length and the total length of the nut tap, the tolerance of the threaded portion length 1 is given in Table 4 and Table 5. Table 4
No.(-Nu.12
No.0-No.12
14~1/2
Inspect the upper limit of the movement of the tap and nut thread cutting part, the hard part, and the rest part between the tips. Table 6 www.bzxz.net
Calibrator radial movement
cutting part oblique movement
handle radial circular movement
find, No.
No.0-No.12., 1/4-5/16
No.0~Nn.12、14-1/2
9116-2
Na.0-No.12、1/4-5/16
Note: The radial surface of the shank of the uniform nut thread is not specified. 2
Sugar-coated thread
Cutting thread
JE/T8614.3—1998
3.7 The threaded part of the threaded nut should have a certain degree of thread. 3.8 The threaded tap with a nominal diameter greater than 7.938mm should be ground. Note: When the user allows, the threaded tap with a relatively dense thread can be ground. 4 Materials and hardness
4.1 Ground taps The threaded part of the wire chain is made of W6Mp5Cr4V2 or other high-speed steel (code HSS) with equivalent performance, or it can be made of high-performance high-reverse potassium (code HSS-). The threaded part of the cut wire chain should be made of 9SiCr, 12A or other grades of alloy tool steel, carbon tool steel with equivalent performance, or it can be made of high-speed steel. The welding handle is made of 45 steel or other steel with equivalent performance. The allowable minimum tolerances of the threaded part of the wire chain and the nut are given in Table 7. No.0-No.4 No.5-No.12 Alloy tool steel, hard case tool steel High-speed steel 62 HKC
The hardness of the taper shank of the screw and the nut from the shank wax should not be less than 30HRC. 4.3
5 Appearance and surface roughness
High-performance high-speed
65 HRC
The screw and nut should not have cracks, tooth gaps, marks, or other defects that affect the usability. 5.1
The contact surface between the screw and nut should be smooth. The upper limit of the surface roughness of the screw and nut is shown in the table. 5, 3||tt| ... T8824.3—[998
d) Marking of unequal diameter taps (the first tap has only one ring, the second tap has two rings or sequence number 1, II); c) Material code (those made of high-speed steel are marked with "HSS\; those made of high-performance high-speed steel are marked with "HSS-E\; taps made of carbon tool steel or alloy tool pins may not be marked) Note: For taps with a nominal diameter of <5.351mm, only the tolerance band number and the thread code may be marked. 6.2 Marking on the packaging tray
B) Name, trademark and address of the manufacturer or distributor: b) Wire chain mark;
c) Material brand or code:
) Year and month of manufacture.
Note: When the type and size in the B/T8824.1—1998 catalog are used, the product name on the packaging box shall be added with the word "ISO\". 6.3 Packaging || TT || The taps should be treated with anti-corrosion before packaging, the packaging must be centered, and prevent permanent damage during transportation.
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