ASME Y14-6:2001 pdf download SCREW THREAD REPRESENTATION
1.4 Definitions
Definitions of terms are in accordance with ASMEB1.7M and the applicable standard.
2 THREAD TYPES
2.1 Straight Threads
Straight 60 deg screw thread designations for drawings are based on ASME B1.1.ASME B1.15ASMEB1.13M,ASME B1.21M,and ASME B1.10M.Straightpipe thread standards are covered in the documentscited in para.2.2.
2.2 Taper Threads
Taper pipe thread designations for drawings are basedon ASME B1.20.1 (General Purpose) and ASMEB1.20.3(Dryseal).
NOTE: Pipe threads are designated in established trade sizes, whichsignify a nominal diameter only.
2.2.1 Taper Pipe Thread Features. General purpose pipe thread forms allow crest and root interferenceor clearance when the flanks contact. When a clearanceoccurs. unless filled with a lute or sealer, a spiralpassage will exist through which leakage can occurThe dryseal pipe thread form does not allow suchclearance, but rather has crest and root metal-to-metalcontact or interference when the flanks contact. It isthis feature that eliminates the need for a lute or sealerto provide for leak-proof assemblies.
2.2.2 General Purpose Taper Pipe Thread Series.General purpose taper pipe thread requirementsare specified in ASME B1.20.1.Included are taperthreads designated as NPT and NPTR. See Table 1for designations and definitions.
NOTES:
(a) Straight pipe threads NPSC NPSL, and NPSM are also includedin ASME B1.20.1.
(b) Aeronautical taper pipe threads specified in MIL-P-7105 weredesignated ANPT，MIL-P-7105 is no longer active, but SAE AS71051 replaces it.
2.2.3 Dryseal Pipe Thread Series. Dryseal pipethreads are specified in ASME B1.20.3.Included aretaper dryseal pipe threads designated NPTF-1.NPTF2, and PTF-SAE Short Series. See Table I for designations and definitions.
NOTE: Internal straight dryseal pipe threads NPSF and NPSI arcalso included in ASME B120.3.
2.3 Acme Threads
Acme screw thread drawing practices are based onASME B1.5.Included are general purpose threads,where there is clearance on flanks and at major/minordiameters,and centralizing threads,where clearance atthe major diameter is limited. See Table 1.
2.4 Stub Acme Threads
Stub Acme screw thread drawing practices are basedon ASME B1.8.See Table 1.
2.5 Buttress Threads
Buttress screw thread drawing practices are basedon ASME B1.9. The Buttress thread is designated“BUTT” for external thread pulls or“PUSH-BUTTfor external thread pushes, See Table 1.
3 REQUIREMENTS
Representation，specification, and dimensioning ofthreads shall be in accordance with the following paragraphs.
3.1 Thread Representation
Three methods in general use for representing screwthreads on drawings are as follows: simplified in Figl. schematic in Fig. 2. and detailed in Fig.3.Onemethod is generally used within any one drawing.Whenrequired,all three methods may be used. See Figs.4and 5
3.1.1 Simplified Representation. The simplifieddrawing method is recommended for straight and taperec60 deg form，Acme,Stub Acme, Buttress, helical coilinsert, and other thread forms except where detailedrepresentations are required. See para. 3.1.3 and Figs1，6,7,and 8.
3.1.1.1 Representation of the vanish (runout)thread should be indicated with the fully formed threadwhether or not it is to be controlled. See Fig. l. Whenessential to design requirements, the vanish thread
ASME Y14-6:2001 pdf download
PS:Thank you for your support!
