IAI America RCA2-TW4N - Manual (Page 72)

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9. Installation
Tightening screws
For the male threads for installing the base, use hexagonal socket head bolts.
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: Exercise caution when selecting the bolt length. Use of bolts of inappropriate lengths may
cause damage to tapped holes, insufficient mounting strength of the actuator and/or
interference with driving parts, resulting in lower precision or unexpected accidents.