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15. Bored hole size before tapping ( for thread cutting ) 15.

■■ for American Standard Pipe ThreadAmerican Standard Pipe Thread

Unit : mm unit: mm unit: mm

Minor diameter of internal threads Bored hole sizeTap Drill Size Minor diameter of internal threads Bored hole size Size Size

Nominal size ( ref.) ( ref.)

Max. Min. Max. Min.

NPSC1/8- 278.8138.6368.77NPSM 1/ 8- 279.2469.0949.21
NPSC1/4- 1811.59211.32911.53NPSM 1/ 4- 1812.21711.88812.13
NPSC3/8- 1814.91914.65614.85NPSM 3/ 8- 1815.55415.31715.49
NPSC1/2- 1418.50118.16118.4NPSM 1/ 2- 1419.27818.97419.2
NPSC3/4- 1423.83523.49523.7NPSM 3/ 4- 1424.63824.33424.5
NPSC 1- 11.529.90329.49029.8NPSM 1- 11.530.75930.50630.7

The drill sizes are according to ANSI/ASME B1.20.1-1983 PIPE THREADS, GENERAL PURPOSE (INCH) (partial listing).

■■ for Dryseal American Standard Pipe ThreadDryseal American Standard Pipe Thread

Unit : mm unit: mm Minor diameter of internal threads Bored hole sizeTap Drill Size Size ( ref.)

Nominal sizeMax.Min.
NPSF1/8- 278.7408.6528.72
NPSF1/4- 1811.36311.23211.33
NPSF3/8- 1814.80314.67214.77
NPSF1/2- 1418.28818.11818.2
NPSF3/4- 1423.63423.46523.5
NPSF 1- 11.529.66929.46429.6

The drill sizes are according to ANSI B1.20.3-1976 Dryseal Pipe Threads (Inch) (partial listing).