ASME Y14:2001 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 B1.15，ASMEB1.13M.ASME B121Mand ASME B1.10MStraightpipe 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 diamneter only.
2.2.1 Taper Pipe Thread Features. General pur.pose 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 occur.The dryseal pipe thread form does not allow suchclearance,but rather has crest and root metal-to-metalcontact or interference when the fanks 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. Gencral purpose taper pipe thread requirementsare specified in ASME B1.20.1. Included are taperthreads designated as NPT and NPTR.Sce Table 1for designations and definitions.
NOTES:(a) Straight pipe threads NPSC, NPSL, and NPSM arc also includedi 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 MIL-P-7105 is no longer active,but SAE AS71051 replaces it.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 pipethrcads are specified in ASME B1.20.3.Included aretaper dryscal pipe threads designated NPTF-1, NPTF2, and PIF-SAE Short Series. See Table 1 for designations and definitions.
NOTE: Internal straight dryseal pipe threads NPSF and NPSI arealso included in ASME B1.20.3.
2.3 Acme Threads
Acme screw thread drawing practices are based onASME B1.5.Included are gencral 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 para-graphs.
3.1 Thread Representation
Three methods in general use for representing screwthrcads on drawings are as follows: simplified in Fig1，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 tapered60 deg form，Acmc,Stub Acmc, Buttress, helical coilinsert, and other thrcad forms except where detailedreprescntations are required. See para. 3.1.3 and Figs.1，6,7,and 8.
ASME Y14:2001 pdf download
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