263 QReference Thread Shape and Reference Dimension Reference Thread Shape and Basic Dimension for a Tapered Male/Female Thread Reference Thread Shape for a Parallel Female Thread Fitting together a tapered female thread or parallel female thread and a tapered male thread. Thick Solid Lines: Reference Thread Shape Thick Solid Lines: Reference Thread Shape Unit: mm r 1 16 90° H 2 55° 27.5° 27.5° r 2 h h 2 H h 2 H P D D2 1 D h 2 H' 2 h H' H' h 6 6 r' 27 .5 ° 27 .5 ° 55° 90° P 1 d d 2 d f a t 1 D 2 D D D D2 1 D D D1 2 D ℓ' ℓ Axial Line of Thread Axial Line of Thread Position of Gauge Dia. Tapered Female Threads Tapered Female Threads Tapered Female Threads Parallel Female Threads r' 25.4 P= n H=0.960237P h=0.640327P r =0.137278P 25.4 P = n H'=0.960491P h =0.640327P r' =0.137329P Nominal of Thread (1) Thread Gauge Dia. Position of Gauge Dia. D, D2 and D1 Tolerances of Parallel Female Threads Length of Effective Thread (Min.) Carbon Steel for Piping Size of Steel Pipe (Reference) Number of Threads in 25.4 mm n Pitch P (Reference) Thread Height h Roundness r or r' Male Thread Male Thread Female Thread Male Thread Female Thread From Position of Gauge Dia. Spot to Major Dia. Spot f With Incomplete Threaded Portion Without Incomplete Threaded Portion From Pipe End Pipe End Outer Dia. d Effective Dia. d2 Minor Dia. d1 Tapered Female Threads Parallel Female Threads Tapered Female Threads, Parallel Female Threads Female Thread Reference Length Axial Tolerance Axial Tolerance From Position of Gauge Dia. Spot to Minor Dia. Spot ℓ From pipe end or pipe fitting end ℓ' (Reference) t(2) Outer Diameter Thickness Minor Dia. D Effective Dia. D2 Inner Dia. D1 a b c R1/ 16 28 0.9071 0.581 0.12 7.723 7.142 6.561 3.97 ±0.91 ±1.13 ±0.071 2.5 6.2 7.4 4.4 − − R1/ 8 28 0.9071 0.581 0.12 9.728 9.147 8.566 3.97 ±0.91 ±1.13 ±0.071 2.5 6.2 7.4 4.4 10.5 2.0 R1/ 4 19 1.3368 0.856 0.18 13.157 12.301 11.445 6.01 ±1.34 ±1.67 ±0.104 3.7 9.4 11.0 6.7 13.8 2.3 R3/ 8 19 1.3368 0.856 0.18 16.662 15.806 14.950 6.35 ±1.34 ±1.67 ±0.104 3.7 9.7 11.4 7.0 17.3 2.3 R1/ 2 14 1.8143 1.162 0.25 20.955 19.793 18.631 8.16 ±1.81 ±2.27 ±0.142 5.0 12.7 15.0 9.1 21.7 2.8 R3/ 4 14 1.8143 1.162 0.25 26.441 25.279 24.117 9.53 ±1.81 ±2.27 ±0.142 5.0 14.1 16.3 10.2 27.2 2.8 R1 11 2.3091 1.479 0.32 33.249 31.770 30.291 10.39 ±2.31 ±2.89 ±0.181 6.4 16.2 19.1 11.6 34 3.2 R11/ 4 11 2.3091 1.479 0.32 41.910 40.431 38.952 12.70 ±2.31 ±2.89 ±0.181 6.4 18.5 21.4 13.4 42.7 3.5 R11/ 2 11 2.3091 1.479 0.32 47.803 46.324 44.845 12.70 ±2.31 ±2.89 ±0.181 6.4 18.5 21.4 13.4 48.6 3.5 R2 11 2.3091 1.479 0.32 59.614 58.135 56.656 15.88 ±2.31 ±2.89 ±0.181 7.5 22.8 25.7 16.9 60.5 3.8 R21/ 2 11 2.3091 1.479 0.32 75.184 73.705 72.226 17.46 ±3.46 ±3.46 ±0.216 9.2 26.7 30.1 18.6 76.3 4.2 R3 11 2.3091 1.479 0.32 87.884 86.405 84.926 20.64 ±3.46 ±3.46 ±0.216 9.2 29.8 33.3 21.1 89.1 4.2 R4 11 2.3091 1.479 0.32 113.030 111.551 110.072 25.40 ±3.46 ±3.46 ±0.216 10.4 35.8 39.3 25.9 114.3 4.5 R5 11 2.3091 1.479 0.32 138.430 136.951 135.472 28.58 ±3.46 ±3.46 ±0.216 11.5 40.1 43.5 29.3 139.8 4.5 R6 11 2.3091 1.479 0.32 163.830 162.351 160.872 28.58 ±3.46 ±3.46 ±0.216 11.5 40.1 43.5 29.3 165.2 5.0 Note(1): The nominal of a tapered male thread is given here. For a taper female thread or parallel female thread, R should be replaced with Rc or Rp. (Refer to*) (2): Tapered thread: length from position of gauge dia. spot to a minor dia. spot.; Parallel female thread: length from a pipe end or pipe fitting end. Reference 1. The threads should be at right angles to the central axial line, and the pitch should be measured along the central axial line. 2. The length of the effective thread means the length over which threads are fully provided. A pipe or a pipe fitting may be left in place on the crests of the last few threads. A chamfered end, if any, of a pipe or a pipe fitting should be included in the length of the effective thread. 3. When the value of a, f and t do not meet the requirements, the criteria of other standard is provided. (*) Tapered threads type for a pipe are specified as taper male thread for a pipe, taper female thread and parallel female thread for a pipe. The parallel female thread for a pipe should be mated with a tapered male thread for a pipe, and differs in dimension tolerances from the parallel female thread specified by JIS B 0202. ( ) GeneralTechnical Information Taper PipeThreads
RkJQdWJsaXNoZXIy MTc2MTk0OA==