IAI America RCA2-SA6R - Manual (Page 55)

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9. Installation
Tightening screws
Use hexagonal socket head bolts for the male threads for installing the base.
Use of high-tension bolts meeting at least ISO 10.9 is recommended.
The length of thread engagement should be 1.8 times more than the nominal diameter, and pay
attention not to stick the screw out inside the actuator.
Caution: Be careful when selecting the bolt length. If bolts of inappropriate lengths are used, the
tapped holes may be damaged, actuator mounting strength may become insufficient, or
contact with driving parts may occur, resulting in lower precision or unexpected accidents.