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BS 1936-1:1952

Current

Current

The latest, up-to-date edition.

Undercuts and runouts for screw threads Inch screw threads

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-12-1952

Co-operating organization
Foreword
Introductory notes
1 Scope
2 Form of undercut
3 Limits of tolerance on diameters of undercuts
4 Thread runouts on external threads
5 Thread runouts on internal threads: recommended hole
  tapping practice
6 Designation of undercuts and thread runouts
Appendix - Formulae for calculating widths of undercuts
           And thread runouts

Provides data of dimensions and profiles of machined undercuts for external and internal threads of Unified, Whitworth, B.A. and Cycle thread forms. Dimensions and tolerances are given for standard cutting tools for this purpose and recommendations are made of widths of undercuts and runouts for various production requirements.

Committee
FME/9
DevelopmentNote
Reviewed and confirmed by BSI, October 2012. (09/2012)
DocumentType
Standard
Pages
16
PublisherName
British Standards Institution
Status
Current

This British Standard relates to dimensions for profile and width of undercuts for external and internal threads of Unified, Whitworth, B.A. and Cycle thread forms and provides for a series of standard tools for producing the undercuts recommended. It makes recommendations concerning practice in regard to undercuts and relates also to allowances for thread runouts. It includes the following:–

  1. Nominal widths of machined undercuts and thread runouts (washout threads) produced from screwing tools.
  2. Recommendations for minimum widths of undercut or runout for various production requirements.
  3. Limits of tolerance on diameters of undercuts.
  4. Standard tools for undercuts.
  5. Formulae for calculating widths of undercuts and runouts. (See Appendix.)

Standards Relationship
AS B199-1962 Identical

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BS 5200:1997 Specification for dimensions of hydraulic connectors and adaptors
BS 1936-2:1991 Undercuts and runouts for screw threads Specification for ISO metric screw threads
BS 1552:1982 Specification for control plug cocks for low-pressure gases
UNI CEN/TS 16650 : 2014 Specification for Hose Couplings for Petrol, Oil and Lubricants - High Pressure Couplings
12/30243876 DC : DRAFT JULY 2012 BS 746 - SPECIFICATION FOR GAS METER UNIONS AND ADAPTORS
S.R. CEN/TS 16650:2014 SPECIFICATION FOR HOSE COUPLINGS FOR PETROL, OIL AND LUBRICANTS - HIGH PRESSURE COUPLINGS
PD CEN/TS 16650:2014 Specification for hose couplings for petrol, oil and lubricants. High pressure couplings
04/30043993 DC : DRAFT APR 2004 BS 746 - SPECIFICATION FOR GAS METER UNIONS AND ADAPTORS
BS 7417:1991 Specification for interface dimensions of flat face \'O\'-ring seal hydraulic couplings
CEN/TS 16650:2014 Specification for hose couplings for petrol, oil and lubricants - High pressure couplings

BS 811:1950 Specification for cycle (B.S.C.) threads (formerly known as C.E.I. threads)
BS 93:1951 Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A.
BS 949(1969) : LATEST
BS 84:1956 Specification for parallel screw threads of Whitworth form
BS 1936-2:1970 Specification for undercuts and runouts for screw threads. ISO metric screw threads

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