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JB/T 12142-2015Combined taps for unified inch threads (English PDF)

美制螺纹复合丝锥

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

April 30, 2015

Implementation date

October 1, 2015

Scope

JB/T 12142-2015 is the English-translated version of 美制螺纹复合丝锥.

JB/T 12142-2015 is the Chinese machinery industry standard covering combined taps for unified inch threads. It was issued on 30 April 2015 and has been in force since 1 October 2015, as a first edition.

The document is under the responsibility of the Ministry of Industry and Information Technology. This page is published from the official record of the 2015 edition.

The figures, limits and tables the standard contains are those of the document itself, delivered in full with the English translation.

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Document preview — JB/T 12142-2015

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

1 Scope
2 Normative references
3 Symbols
4 Types and dimensions
5 Technical requirements
5.1 Appearance and surface roughness
5.2 Dimensional tolerances
5.3 Positional tolerances
5.4 Drill portion
5.5 Tap portion
5.6 Material and hardness
6 Marking and packaging
6.1 Marking
6.2 Packaging
Annex A (normative) Hexagon connection dimensions of the combined tap
Figure 1 Type of the combined tap with a nominal tap diameter d not greater than 6,35 mm
Figure 2 Type of the combined tap with a nominal tap diameter d greater than 6,35 mm
Figure A.1 C type external hexagon construction
Figure A.2 E type external hexagon construction
Table 1 Dimensions of the combined tap with a nominal tap diameter d not greater than 6,35 mm
Table 2 Dimensions of the combined tap with a nominal tap diameter d greater than 6,35 mm
Table 3 Upper limit values of the surface roughness
Table 4 Limit deviations of the tap portion of the combined tap
Table 5 Circular run-out of the working portion with respect to the axis of the shank
Table 6 Web thickness of the fluted portion of the combined tap
Table A.1 Dimensions of the C type external hexagon construction
Table A.2 Dimensions of the E type external hexagon construction

Document data

International classification (ICS): 25.100.50.

Chinese classification (CCS): J41.

Estimated length of the Chinese original: 10,178 words.

3 Symbols

4 Types and dimensions

5 Technical requirements

6 Marking and packaging

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Similar standards

JB/T 8824.1-2012|JB/T 8824.2-2012|JB/T 8824.3-2012|JB/T 8824.4-2012|JB/T 12143-2015|QC/T 263-1999

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