Общий каталог Yamawa 2022 - 2023 - страница 1194

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Technical Description of productsInformation ④（ ） ⑤（t） 15. Bored hole size before tapping ( for thread cutting ) ■ Recommended Bored Hole Size Table for Taper Pipe Threads (PT) (refer to JIS B 0203) ・PT internal threads have R design on their crests. The taps should cut threads with their thread root. ・On thread having non-full threads, if you are going to cut effective thread length ℓ , use the tap of long type. Unit：mm Thread Standards Minor Diameter Recommended Bored reference When When Hole Sizes (reference) Tap Size Basic DiameterBasicPositionDiameterEffective Thread Length(Minimum)Pipe End(WorkpieceFace)Threadshavenon-FullThreadsThreadsdo not havethe non-FullThreadsMaximum Size ofStraight Bored HoleBasic DiameterPosition,ℓgPipe EndTolerancein radialdirectionTolerance inaxialdirectioncWhenThreadsWhenThreads(BasicDiamater )Positionaway fromPositionaway fromhavedo not havePipe EndPipe Endnon-Fullthe non-Fullby ℓby tThreads1)Threads1)ℓtBasicSizeBasicSizeBasicSizeWhenWhenThreadsThreadsLongShorthavedo not haveThreadThreadRcnon-Fullthe non-FullTypeTypeThreadsThreads ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ PT 1/16 - 28 ± 0.071 ± 1.13 6.2 4.4 6.561 6.174 6.286 6.1 6.2 13.0 10.5 10.1 PT 1/8 - 28 ± 0.071 ± 1.13 6.2 4.4 8.566 8.179 8.291 8.1 8.2 13.0 10.5 10.1 PT 1/4 - 19 ± 0.104 ± 1.67 9.4 6.7 11.445 10.858 11.026 10.7 10.9 21.0 12.5 15.0 PT 3/8 - 19 ± 0.104 ± 1.67 9.7 7.0 14.950 14.344 14.513 14.2 14.4 21.0 14.0 15.4 PT 1/2 - 14 ± 0.142 ± 2.27 12.7 9.1 18.631 17.837 18.062 17.6 17.9 25.0 17.0 20.5 PT 5/8 - 14 ± 0.142 ± 2.27 (13.4) (9.65) 20.587 19.750 19.984 19.6 19.8 25.0 - - PT 3/4 - 14 ± 0.142 ± 2.27 14.1 10.2 24.117 23.236 23.480 23.0 23.3 25.0 19.0 21.8 PT 7/8 - 14 ± 0.142 ± 2.27 (15.2) (10.9) 27.877 26.930 27.196 26.7 27.0 28.0 - - PT 1- 11 ± 0.181 ± 2.89 16.2 11.6 30.291 29.279 29.566 29.0 29.3 32.0 22.0 26.0 PT 1 1/8 - 11 ± 0.181 ± 2.89 （17.4） （12.5） 34.939 33.855 34.158 33.6 33.9 32.0 - - PT 1 1/4 - 11 ± 0.181 ± 2.89 18.5 13.4 38.952 37.796 38.115 37.6 37.9 32.0 24.5 28.3 PT 1 1/2 - 11 ± 0.181 ± 2.89 18.5 13.4 44.845 43.689 44.008 43.5 43.8 32.0 25.5 28.3 PT 1 3/4 - 11 ± 0.181 ± 2.89 （18.5） （13.4） 50.788 49.632 49.951 49.4 49.7 32.0 - - PT 2- 11 ± 0.181 ± 2.89 22.8 16.9 56.656 55.231 55.600 55.0 55.4 35.0 27.5 32.7 PT 2 1/4 - 11 ± 0.216 ± 3.46 （26.7） （18.6） 62.752 61.083 61.590 60.8 61.3 50.0 - - PT 2 1/2 - 11 ± 0.216 ± 3.46 26.7 18.6 72.226 70.557 71.064 70.3 70.8 50.0 32.0 37.1 PT 3- 11 ± 0.216 ± 3.46 29.8 21.1 84.926 83.064 83.607 82.8 83.3 52.0 36.0 40.2 PT 3 1/2 - 11 ± 0.216 ± 3.46 31.4 22.4 97.372 95.410 95.972 95.1 95.7 52.0 - 46.2 PT 4- 11 ± 0.216 ± 3.46 35.8 25.9 110.072 107.835 108.453 107.6 108.2 55.0 - 46.2 Note 1) Length toward End of Smaller Diameter from Basic Diameter Position Remarks 1. Opening of Internal Thread (Face of workpiece) is Basic Diameter Position. When Threads havenon-Full Threads When Threads do not havethe non-Full ThreadsRemarks 2. Effective Thread Length has 2 types, with ⑥ ⑥ non-Full Thread Type and without non-Full Basic Diameter Position Thread Type. Remarks 3. Concerning bored hole shape, considering load on taps, taper bored hole is recommended. Remarks 4. When a prepared hole is tapered, use a synchronized feed tapping machine. Remarks 5. W h e n applying taper bored hole, by ⑦ referring to values shown in columns ②· ⑧ ⑥〜⑧ , prepare the taper hole by using pipe reamer (1/16 taper). By referring to values shown in columns ⑨ and ⑩ , select the drill diameter before reaming by taking reamer's margin into account. Remarks 6. When preparing straight bored hole, by referring to values shown in columns ⑨ and ⑩ , select drill diameter. Technical-43