IAI America RCA2-TW4N - Manual (Page 90)

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9. Installation
9.4 T Grooves
The main unit surface side of TA5C, 6C, 7C and TR type contains T grooves (M3 size) for attaching
external devices.
These grooves are to be used for whatever needs may arise, such as installing sensors, fastening wiring,
etc.
T groove measurements are shown below.
A use of square nut is recommended for the T grooves, but a hex nut can also be used.
Pay careful attention to the length so that the edge of the bolt won't contact the base of T grooves
during installation.
5.8 3.3
1.8
5.5
2.7