Обший каталог Yamawa 2016 - 2017 - страница 816

Предыдущая страница Следующая страница

Навигация

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

■■ for American Standard Pipe ThreadAmerican Standard Pipe Thread

Unit : mm unit: mm unit: mm

Nominal size SizeTap Drill Si Minor diameter o Max.ze f internal threads Min.Bored hole size ( ref.)
NPSC1/8 - 278.8138.6368.77
NPSC1/4 - 1811.59211.32911.53
NPSC3/8 - 1814.91914.65614.85
NPSC1/2 - 1418.50118.16118.4
NPSC3/4 - 1423.83523.49523.7
NPSC1 - 11.529.90329.49029.8
SiMinor diameter of internal threadsBored hole size
zeMax.Min.( ref.)
NPSM1/8 -279.2469.0949.21
NPSM1/4 -1812.21711.88812.13
NPSM3/8 -1815.55415.31715.49
NPSM1/2 -1419.27818.97419.2
NPSM3/4 -1424.63824.33424.5
NPSM1 -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

SiTap Drill Si Minor diameter oze f internal threadsBored hole size
Nominal size zeMax.Min.( ref.)
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
NPSF1 -11.529.66929.46429.6

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