This standard specifies the basic requirements for the type and size, technical requirements, performance tests and marking and packaging of spiral groove taps. This standard applies to machine-made spiral groove taps for machining ordinary threads. Such taps are usually used for tapping blind holes or intermittent surface holes on ductile metal parts. The thread accuracy of the taps is manufactured according to three tolerance zones: H1, H2 and H3. GB/T 3506-1993 Spiral Groove Taps GB/T3506-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Machine taps with helical flutesThis standard adopts the international standard ISO529-1975 "Short machine taps and hand taps". Subject content and scope of application
GB/T 3506
5-93
Replaces GB350683
This standard specifies the basic requirements for the type and size, technical requirements, performance tests and marking and packaging of spiral flute taps. This standard is applicable to machine spiral flute taps for machining ordinary threads. This type of tap is usually used for tapping blind holes or intermittent surface holes on ductile metal parts. The thread accuracy of the tap is manufactured according to the three tolerance zones of H1, H2 and H3. 2 Reference standards
G3 4267
Shaft diameter and driving square head size for straight shank rotary tools Tap thread tolerance
Technical conditions for taps
3 Types and sizes
3.1 The types and sizes of taps shall comply with the provisions of the following figure and Tables 1 and 2. Applicable #M3~6
Applicable FM7~33
Approved by the State Administration of Technical Supervision on April 17, 1993 218
Implemented on December 1, 1993
Coarse pitch ordinary thread taps
Nominal diameter
Note: Dimensions in brackets should be avoided as much as possible. 3i1.2 Fine pitch ordinary thread tap
GB/T 3506—93
M3. 5 X 0. 35
M10×1.25
M14X 1.25
M18×2
Nominal diameter
GB/T 3506---93
(33）
M30×2
M33×2
Nominal diameter
Note: Dimensions in brackets should be avoided as far as possible. 3.2 The tolerances of dimensions are as follows;
GB/T 3506-93
Continued Table 2
3.2.1 The tolerance of the total length L is h16, and the tolerance of the threaded portion length 1 is in accordance with Table 3. Table 3
Tap nominal diameter
>12～33
3.2.2 The tolerance of the shank diameter d is h9.
3.2.3 The tolerance of the square head dimension a is h12.
3.3 Taps with a nominal diameter d less than or equal to 6mm can be made into external tips 3.4 Taps are produced as single tapers, and the cutting part length 15 is recommended to be 2.5~~3.5 teeth. 3.5 The spiral groove angle of the tap is selected according to Table 4. d
Limit deviation
Spiral direction
Right spiral
Left spiral
3.6 Marking example:
Spiral groove angle
Small spiral
Medium spiral groove angle
Large spiral groove angle
GB/T 3506--93
Selection range
10～20
20~~40
Production according to order
Selected value tolerance
Added object
Carbon steel, alloy steel, etc.
Stainless steel, light alloy, etc.
Coarse pitch ordinary thread, nominal diameter d-10mm, pitch P-1.5mm, tolerance zone H1, spiral groove angle of 30°, spiral groove tap is marked as:
Spiral groove tap R30-M10-H1GB/T 3506 fine pitch ordinary thread, nominal diameter d = 10mm, pitch P = 1mm, tolerance zone H1, spiral groove angle: the mark of the left spiral groove tap with a spiral groove angle of 45° is:
spiral groove tap R45R-M10X1-H1GB/T3506 Note: The letter R represents that the spiral groove of the tap is left-handed. 3.7 The structural elements and recommended cutting angle values ​​of the tap are listed in Appendix A (reference) of this standard 4 Technical requirements
4.1 The surface of the tap shall not have defects such as cracks, chipping, rust and grinding burns that affect its performance. 4.2 The maximum allowable value of the surface roughness of the tap shall be as follows: Front: R6.3pm
Back: R.3.2um
Thread surface: R.3.2um
Shank surface; R1.25μm
4.3 The manufacturing tolerance of the threaded part of the tap shall be as specified in GB968. 4.4 Check the radial round runout of the working part and the shank of the tap between the centers, which shall not exceed the provisions of Table 5. Table 5
Nominal diameter
≥10～18
4.5 The hardness requirements of the tap are as follows:
Cutting part
4.5.1 The hardness of the working part shall be as specified in Table 6. 222
Calibration part
Nominal diameter d
>3～6
4.5.2 The hardness of the square head of the shank: not less than HRC30. GB/T3506-93
4.6 The taps for processing stainless steel with tack shall be subjected to surface strengthening treatment. 4.7 The other technical conditions of the taps shall comply with the provisions of GB969. 5 Performance test
General provisions
Not less thanbZxz.net
Each batch of taps shall be subjected to cutting performance sampling test, with the number of test samples n, the qualified judgment number A. and the unqualified judgment number R. According to Table 7, the batch range is generally adopted
2~～50
51~500
501～35 000
5.2 Test conditions
5.2.1 Test machine tool
The test shall adopt a vertical drilling machine that meets the precision standards. 5.2.2 Test materials and technical requirements
The test material is 45 steel, with a hardness of HB170~200.5.3 Cutting specifications
5.3.1 Cutting specifications are as specified in Table 8.
Used when quality is stable
Nominal diameter of wire chain
>6~12
>12~24
Cutting speed
GB/T3506--93
Tapping depth
5.3.2 The coolant used in the test is an emulsified oil-water solution with a concentration of 1:20, and the flow rate is not less than 5I./min. 5.4 Evaluation of test results
The taps after the test shall not have chipping or significant blunting, and shall maintain their original performance. 6 Marking, Packaging
6.1 Marking
The taps should be marked with: manufacturing/trademark, thread code, tap tolerance code. Rose thread hole number
The tap packaging box should be marked with: product name, standard number, manufacturer name and trademark, thread code, tap tolerance code, and left-hand spiral groove taps should also have their special mark (R).
6.2 Packaging
The taps should be treated with rust prevention before packaging. The packaging must be firm and prevent damage during transportation. 224
GB/T3506-93
Appendix A
Recommended values ​​of structural elements and cutting angles of taps (reference)
A1 Structural elements and cutting angles of taps (measured in the back plane) are recommended in Figure A1 and Table A1, Table A2 Figure Al
Nominal diameter
Basic size
Limit deviation
Basic size
Limit deviation
Nominal diameter
Processed material
Carbon steel, alloy structural steel||tt ||Stainless steel, light alloy
GB/T3506--93
Continued Table A1
Basic size
2°-~6°
4°8°
Limit deviation
Basic size
Limit deviation
Cutting part relief angle α
3°~~5°
A2 For taps with a nominal diameter (d) less than or equal to 10mm, the cone core diameter (d.) is made into a positive taper along the groove length, and the value is 1~1.5mm at a length t of 100mm.
A3 The relief grinding amount of the thread tooth profile on the full length of the working part of the wire is recommended in Table A3. Table A3
Nominal diameter
Relief grinding amount
Additional notes:
0. 01~0. 02
0. 02 ~0. 03
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Tool Standardization. This standard was drafted by the Chengdu Tool Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Lu Fuying.
This standard was first issued in February 1983 and revised for the first time in 1989. 326
0.03~0.04
0. 04~0. 06
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