What you should know about Inch Threads or Inch Screws you can find here.
Conversion inch in cm
- 1 inch (Zoll) = 2,54 cm
- 1 inch (Zoll) = 25,4 mm
Inch threads are defined by your gear number per inch. This, together with the thread diameter, is the basis for determining the thread type. Inch threads are defined by your gear number per inch. This, together with the thread diameter, is the basis for determining the thread type. For example, a 1/4" UNC - American coarse thread has 20 threads per inch, a 1/4" UNF - American fine thread has 28 threads.
A thread template or thread gauge can also be used to determine a thread. This is the easiest way to measure a thread and to determine it accurately.
Example:
1/4 Zoll - 20 x 1/2 inch hex bolt
1/4 = Thread outer diameter 6,35 mm
20 = number of threads per inch (25,4 mm) length
1/2 = length of screw from head 12,70 mm
Example:
1/4 Zoll - 28 x 1/2 inch hex bolt
1/4 = Thread outer diameter 6,35 mm
28 = number of threads per inch (25,4 mm) length
1/2 = length of screw from head 12,70 mm