התקרב ככל הנראה מגפה thread size מפורסם קטרקט קריקט
How to Identify Thread Pitch and Size | Tech Tips | Swagelok [2020] - YouTube
Everything you wanted to know about taps but were afraid to ask, styles of taps, class of thread , gh numbers , basic point in thread measurement , constants for finding pitch
Understanding Thread Sizing
How to Identify Thread Sizes - Summit Hydraulics
Fitting Thread Size Chart - Printable
An easy to read chart of screw sizes and thread counts