IAI America ISPDACR-ESD - Manual (Page 39)

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5. Installation
Tightening torque
Applicable bolt
Bolt seating surface is steel Bolt seating surface is aluminum
M8 31.3 N-m (3.19 kgf-m) 14 N-m (1.43 kgf-m)
Caution: The tapped holes are closed at the end, so pay careful attention when selecting the bolt
length. If inappropriate bolts are used, the tapped holes may be damaged or installation
strength of the actuator may become insufficient, resulting in poor accuracy or unexpected
accidents.
About tightening screws
When installing the base, use hexagonal socket head bolts, etc., for the male threads.
Use high-tension bolts conforming to ISO 10.9 or higher.
If a tapped hole is used, use a screw not longer than the engagement length.
If the tapped hole is through, be careful not to let the tip of the bolt project from the hole.
Note changed to 1.8 times more of the nominal diameter for the length of thread engagement.
If the bearing surface of the base is made of aluminum, insert a dedicated washer for high-tension bolt
at each bolt (otherwise, the bearing surface may buckle).
Bolt seating surface
Bolt
Seating surface Seating surface