IAI America RCA2-TW4N User Manual
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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.
Caution: The tap hole of the mounting part is a through hole. Never use a screw longer than the
effective screw length. Internal mechanisms and electric components may be damaged.