oil level gauge

oil level gauge

The representation method of British thread grade: (e.g. 3/16-32UNF-1B) 3/16 is the major diameter (outer diameter) of the thread, calculated in inches, with 1 inch=25.4 mm

32 refers to having 32 threads per inch, which specifies the pitch; UNF stands for United Fine Thread, which means British fine thread, some are UNC, and C refers to coarse thread; 1B is the tolerance accuracy level, similar levels include 2A, 3A, and so on.

For example, 3/16-32 means there are 32 teeth per inch of length, because 1 inch equals 25.4 millimeters. Therefore, 25.4/32 is the pitch, and 25.4/16 * 3 is the outer diameter.