Kontron COMe Starterkit Eval T2 - Manual (Page 197)

Mechanical Considerations
7.2.2. Bottom mounting
Heatspreaders with threaded standoffs are used for bottom-mounting solutions.
This variant of the heatspreader has been designed to be used in systems where the
heatspreader screws need to be inserted from the bottom side of the complete assembly. For
this solution a heatspreader version with threaded standoffs must be used. In this case, the
standoffs used on the Carrier Board are not threaded.
Figure 77: Complete assembly using threaded heatspreader
Note The torque specification for heatspreader screws is 0.5 Nm.
Caution Do not use a threaded heatspreader together with threaded Carrier Board
standoffs. The combination of the two threads may be staggered, which could
lead to stripping of the threads in either the standoffs of the heatspreader or
Carrier Board.
7.2.3. Materials
Independently from the above mentioned mounting methods the material from the tables below is
required to mount a COM Express Module to a Carrier Board.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
197/218
Carrier board
COM Express Module
Heatspreader (HSP)
M2.5 Screw
and Washer
Baseboard
stand-off
(Ø2.7 bore hole)
HSP stand-off
(M2.5 thread)