BS 949-3:1993
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Screwing taps. Specification for pipe thread taps
Hardcopy , PDF
31-03-2017
English
15-03-1993
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Committees responsible
Foreword
Specification
1. Scope
2. References
3. Right-hand and left-hand threads
4. Terminology of thread profiles
5. Types and sizes of taps
6. General dimensions
7. Dimensions and manufacturing tolerances for the
threaded portion of taps for G series and Rp
series threads
8. Dimensions of the threaded portion of taps for Rc
series threads
9. Marking
Annex
A. (informative) Examples of the calculation of
thread dimensions
Tables
1. Summary of the size designations of taps for pipe
threads
2. General dimensions of taps for parallel pipe
threads (G series and Rp series)
3. Dimensional tolerances on shanks and squares
4. Dimensional tolerances on length of thread and on
overall lengths
5. General dimensions of taps for taper threads (Rc
series)
6. Limits of tolerances
7. Dimensions and manufacturing tolerances for the
threaded portion of taps for G series pipe threads
8. Dimensions and manufacturing tolerances for the
threaded portion of taps for Rp series pipe threads
9. Dimensions of the threaded portion of taps for Rc
series pipe threads
A.1 Calculation of the dimensions of the threaded
portion of a G half ground-thread tap
A.2 Calculation of the dimensions of the threaded
portion of an Rp half ground-thread tap
Figures
1. Thread profile of a nut with a G series thread
2. Thread profile of a tap for a G series thread
3. Thread profile of a nut with an Rp series thread
4. Thread profile of a tap for an Rp series thread
5. Thread profile of a nut with an Rc series thread
6. Thread profile of a tap for an Rc series thread
7. Tap for parallel pipe threads (G series and Rp
series)
8. Tap for taper pipe threads (Rc series)
9. Nut and tap ptich diameter tolerances, G series
threads
10. Nut and tap pitch diameter tolerances, Rp series
threads
11. Threaded portion of tap for taper pipe threads
(Rc series)
List of references
Specifies tolerances and dimensions for screwing taps for the following thread series: parallel internal pipe threads for use with taper external pipe threads in making pressure-tight joints on the threads; parallel internal pipe threads for use where pressure tight joints are not required to be made on the threads; taper internal pipe threads for use with taper external pipe threads in making pressure-tight joints on the threads. Also includes tables and diagrams.
| Committee |
W/-
|
| DevelopmentNote |
Supersedes BS 949-3(1982) Supersedes 90/79113 DC (10/2005) Reviewed and confirmed by BSI, December 2009. (11/2009)
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| ISO 2857:1973 | Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches — Manufacturing tolerances on the threaded portion |
| ISO 2284:2017 | Hand taps for parallel and taper pipe threads — General dimensions and marking |
| BS 4500-1.2(1990) : AMD 7631 | ISO LIMITS AND FITS - GENERAL, TOLERANCES AND DEVIATIONS - TABLES OF COMMONLY USED TOLERANCE GRADES AND LIMIT DEVIATIONS FOR HOLES AND SHAFTS |
| ISO 5967:1981 | Taps and thread cutting Nomenclature of the main types and terminology |
| BS 949-5:1990 | Screwing taps Nomenclature and terminology |
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