Japan) is a JIS standard. Most screws are classed as this, but some are marked for 2 different standards. It is unlikely that you will ever be confused because the two standards are so different. These screws are designated by having a sticker with a D, A, or X on it. The standard that it is printed on the back of the screw. Any screws marked D or A are made in Japan. Screws marked X are made in the United States and Canada.
NPS5910_C
Japan
5/0.8
X
-
.
NPS5910_D
3/0.8
NPS5910_A
NPS5910_X
USA/Canada
While you may have a mechanical advantage with more than one hold, the screw(s) on the locknut(s) control the movement of the locknut(s) and the end of travel. They can be tightened in a ratio of 2:1, 3:1, 4:1, 5:1, 6:1, or 8:1. Each one provides a slightly different mechanical advantage. It depends on your specific machine and individual application whether you use more or less than the listed number. A minimum of two of each type is required.
3
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