Общий каталог Yamawa 2021 - страница 722
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American Taper Pipe Threads (NPTF) (Refer to ANSI/ASME B1.20.1-1983) Unit: mm
SP
| Size | L1 | L3 (3P) | L1+L3+1P | (Basic | Pipe End Diameter Pos | Minor D ition) | iameter Position | away from Pip (L1+L3+1P ) | e End by | Bored Hole Size (reference) Maximum Size of | reference Tap Basic Diameter Position | |
| Maximum Value | Minimum Value | Tolerance | Maximum Value | Minimum Value | Tolerance | StraightBored Hole | ℓg | |||||
| 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 | 17.45 |
| NPTF | 3/8 - 18 | 6.096 | 4.234 | 11.741 | 14.923 | 14.836 | 0.087 | 14.189 | 14.103 | 0.086 | 14.17 | 17.65 |
| 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 |
| 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 |
ST
ROLL
CARBIDE
HAND ENGAGEMENT(L1)+L3 + ONE TURN FULL THREAD
LONG
| L | = p | Remarks 1. Pipe End is Basic Diameter Position (E1). | |||
| 3 | 3 | L1 | |||
| 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.
EG (STI)
Remarks 5. When preparing straight bored hole, by referring to values shown in column !, select drill diameter.
SPECIAL
THREADS,