Views: 0 Author: Site Editor Publish Time: 2023-04-07 Origin: Site
1. Selection of BSD and CSD stainless steel round washer head self-drilling screws
Under normal circumstances, #2 point is used below 6# (inclusive), the #3 point is used above 8# (inclusive), and the #5 point is best used on 12# and 14#.
When the length of 8# and 10# is less than 1/2'' (inclusive), it shall use #2 point, and the other 10# or more shall be the #3 point.
The lower limit of the length required for flat head BSD #2 and #3 drill point is:
6#/8# screws: #2 point---Min 13mm #3 point---Min 16mm
10# screws: #2 point---Min 16mm #3 point---Min 19mm
12# screws: #3 point---Min 22mm
14# screws: #3 point---Min 25mm
2. The length of stainless steel round washer head self-drilling screws:
Less than 1-1/2’’: Full thread
Above 1-1/2’’: Half thread, and thread length is 1-1/2’’.
3. Different Head Type
The regular head types of stainless steel washer head drilling screws include hexagonal washer head (HW), pan head (P), countersunk head (F)
4. Difference Between CSD and BSD Thread
The thread type mainly includes BSD thread and CSD thread.
The difference between them is that the BSD thread type is the type of the AB self-tapping thread, and the CSD thread is the mechanical thread.
