Общий каталог Yamawa 2022 - 2023 - страница 1196

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Technical Description of productsInformation E3 E0 E1 D percentage of Thread Height (%) percentage of Area Removed (%) 15. Bored hole size before tapping ( for thread cutting ) ■ Recommended Bored Hole Size Table for American Dryseal Taper Pipe Threads (NPTF) (Refer to ANSI B1.20.3-1976, re-confirmed in 1982) Unit：mm Bored Hole reference Minor Diameter Size (reference) Tap Size L1 L3(3P) L1+L3+1P Pipe End Position of Maximum Basic (Basic Diameter Position) ( L1+L3+1P ) Size of Diameter MaximumValue MinimumValueTolerance MaximumValueMinimumValueTolerance StraightBored HolePositionℓg ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ 1/16 - 27 NPTF 4.064 2.822 7.827 6.505 6.414 0.091 6.015 5.923 0.091 5.99 12.00 1/8 - 27 NPTF 4.102 2.822 7.865 8.852 8.761 0.091 8.362 8.270 0.091 8.34 12.05 1/4 - 18 NPTF 5.786 4.234 11.431 11.484 11.397 0.086 10.770 10.684 0.086 10.75 17.45 3/8 - 18 NPTF 6.096 4.234 11.741 14.923 14.836 0.086 14.189 14.103 0.086 14.17 17.65 1/2 - 14 NPTF 8.128 5.443 15.386 18.419 18.333 0.086 17.459 17.373 0.086 17.44 22.85 3/4 - 14 NPTF 8.611 5.443 15.868 23.764 23.678 0.086 22.773 22.687 0.086 22.75 22.95 1- 11 1/2 NPTF 10.160 6.627 18.996 29.812 29.726 0.086 28.625 28.538 0.086 28.60 27.40 11/4 - 11 1/2 NPTF 10.668 6.627 19.504 38.569 38.483 0.086 37.350 37.263 0.086 37.33 28.10 11/2 - 11 1/2 NPTF 10.668 6.627 19.504 44.639 44.552 0.086 43.420 43.334 0.086 43.40 28.40 2- 11 1/2 NPTF 11.074 6.627 19.910 56.677 56.590 0.086 55.432 55.345 0.086 55.41 28.00 Remarks 1. Pipe End is Basic Diameter Position (E1). HAND ENGAGEMENT(L1)+L3 Remarks 2. Effective Thread Length is the length + ONE TURN FULL THREAD away from Pipe End by (L1+L3+1P). L 3= 3p L Remarks 3. Concerning bored hole shape, considering load on taps, taper bored hole is recommended. Remarks 4. When applying taper bored hole, by referring NPTF INTERNAL THREAD to values shown in columns ⑤, ⑥ and ⑧, ⑨ , prepare the taper hole by using pipe NPTF EXTERNAL THREAD reamer (1/16 taper). By referring to values in shown column ⑪ , select the drill diameter before reaming by taking reamer's margin into account. Remarks 5. When preparing straight bored hole, by referring to values shown in column ⑪, select drill diameter. ■Percentage of Thread Engagement & Relation between Percentage of Thread Height and Area Removed at A Thread Height Percentage of Thread Engagement internal Basic Major Dia. − Hole Size Before Tapping threads 100 2× (Basic Thread Overlap) Basic Thread Overlap Metric & Uni ed Thread 0.5413P Whitworth Thread 0.5664P Pipe Thread (Rc, Rp, G, PT, PS, PF) 0.6403P P=Pitch As shown above, when the thread height increases, the amount of material to be removed increases rapidly, so it is an advantage to tap users to keep the hole size (thread minor diameter) as large as possible. Technical-45