Общий каталог Yamawa 2021 - страница 722

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24. Drill size and recommended hole size for cutting taps Intro American Taper Pipe Threads (NPTF) (Refer to ANSI/ASME B1.20.1-1983) Unit: mm Bored Hole reference SP Minor Diameter Size Size L1 L3(3P) (reference) TapL1+L3+1PPipe End(Basic Diameter Position)MaximumValueMinimumValueTolerancePosition away from Pipe End by(L1+L3+1P )MaximumValueMinimumValueToleranceMaximumSize ofStraight BoredHoleBasic DiameterPositionℓgSL 1 2 3 4 5 6 7 8 9 0 ! " NPTF 1/16 - 27 4.064 2.822 7.827 6.505 6.414 0.091 6.015 5.923 0.092 5.99 12.00 NPTF 1/8 - 27 4.102 2.822 7.865 8.852 8.761 0.091 8.362 8.270 0.092 8.34 12.05 NPTF 1/4 - 18 5.786 4.234 11.431 11.484 11.397 0.087 10.770 10.684 0.086 10.75 17.45NPTF3/8 - 186.0964.23411.74114.92314.8360.08714.18914.1030.08614.1717.65PO NPTF 1/2 - 14 8.128 5.443 15.386 18.419 18.333 0.086 17.459 17.373 0.086 17.44 22.85 NPTF 3/4 - 14 8.611 5.443 15.868 23.764 23.678 0.086 22.773 22.687 0.086 22.75 22.95 NPTF 1 - 1 1.5 10.160 6.627 18.996 29.812 29.726 0.086 28.625 28.538 0.087 28.60 27.40 NPTF 1 1/4 - 1 1.5 10.668 6.627 19.504 38.569 38.483 0.086 37.350 37.263 0.087 37.33 28.10 ST NPTF 1 1/2 - 1 1.5 10.668 6.627 19.504 44.639 44.552 0.087 43.420 43.334 0.086 43.40 28.40 NPTF 2 - 1 1.5 11.074 6.627 19.910 56.677 56.590 0.087 55.432 55.345 0.087 55.41 28.00 ROLL CARBIDE HAND ENGAGEMENT(L1)+L3 + ONE TURN FULL THREAD L 3= 3p L1 Remarks 1. Pipe End is Basic Diameter Position (E1). LONG Remarks 2. Effective Thread Length is the length away from Pipe End by (L1+L3+1P). NPTF INTERNAL THREAD Remarks 3. Concerning bored hole shape, considering load on taps. taper bored hole is recommended. HAND NPTF EXTERNAL THREAD Remarks 4. When applying taper bored hole, by referring to values TAPS shown in columns 5, 6 and 8, 9, prepare the taper hole by using pipe reamer (1/16 taper). By referring to values in shown column !, select the drill diameter before reaming by taking reamer’s margin into account.Remarks 5.When preparing straight bored hole, by referring to valuesEG (STI) shown in column !, select drill diameter. SPECIAL THREADS, GAUGES THREAD MILLS DIES CENTER DRILLS Technical info 723 E3 E0 E1 D