■ Recommended Bored Hole Size Table for American Taper Pipe Threads (NPT) (Refer to ANSI/ASME B1.20.1-1983)

Unit:mm Bored Hole reference Minor Diameter Size (reference) Tap

Size L1 L3 L1+L3 Maximum Basic

Pipe End (Basic Diameter Position) Position away from Pipe End by (L1+L3) Size of Diameter

Maximum Minimum Minimum Straight Position

Tolerance Maximum Tolerance

ValueValueValueValueBored Holeℓg
1/16 - 27NPT4.0642.8226.8866.5106.3880.1226.0805.9580.1226.0512.00
1/8 - 27NPT4.1022.8226.9248.8578.7360.1228.4258.3030.1228.3912.05
1/4 - 18NPT5.7864.23410.02011.51411.3570.15710.88810.7300.15710.8517.45
3/8 - 18NPT6.0964.23410.33014.95314.7960.15714.30814.1500.15714.2717.65
1/2 - 14NPT8.1285.44313.57118.48518.3230.16317.63717.4750.16317.6022.85
3/4 - 14NPT8.6115.44314.05423.83123.6680.16322.95222.7900.16322.9122.95
1 - 11 1/2 NPT10.1606.62716.78729.86829.6960.17328.81928.6470.17328.7827.40
1 1/4 - 11 1/2 NPT10.6686.62717.29538.62538.4520.17337.54437.3720.17337.5028.10
1 1/2 - 11 1/2 NPT10.6686.62717.29544.69544.5220.17343.61443.4410.17343.5728.40
2 - 11 1/2 NPT11.0746.62717.70156.73256.5600.17355.62655.4540.17355.5828.00
2 1/2 - 8NPT17.3236.35023.67367.80667.6180.18866.32666.1380.18866.2840.80
3 - 8NPT19.4566.35025.80683.71583.5270.18882.10281.9140.18882.0542.95

Remarks 1. Pipe End is Basic Diameter Position (E1). Remarks 2. Effective Thread Length is the length away from Pipe End by (L1+L3). Remarks 3. C o n c e r n i n g b o r e d h o l e s h a p e , NPT INTERNAL THREAD considering load on taps, taper bored hole is recommended. L3 L1 Remarks 4. When applying taper bored hole, by referring to values in shown columns ⑤ , ⑥ and ⑧ , ⑨ , prepare the taper NPT EXTERNAL THREAD hole by using pipe reamer (1/16 taper). By referring to values shown in 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.

Technical Inf