Data Sheet

Bluegiga Technologies Oy
Page 44 of 52
10 Attachment to motherboard
In order to ease assembly of the APx4 module, it has slightly oval attachment holes. The size of the hole is
~2.2x3.0mm. This makes it possible to attach a screw and nut to the motherboard before inserting the
module.
Parameter
Size
Note
Diameter
M2
Length
<= 10mm, 8mm recommenced
Length excluding head
Head diameter
<= 3.8mm
Material
Steel or similar
*Do not use plastic material
Table 60: Screw size
Parameter
Size
Note
Size
M2
Material
Steel or similar
*Do not use plastic material
Table 61: Nut size
*Use metal screws and nuts that connect to ground, as that improves the function of the APx4
integrated antenna. Nylon/plastic screws/nuts may be used only if the motherboard’s locking clips are
grounded. Metal screws and nuts will also improve the heat conductivity compared to nylon/plastic.
For automatic assembly Phillips, Pozi or Torx head is recommended.
A suitable screw is Bossard’s PN 1151495 with following features:
 BN 380 - ISO 7048
 Cross recessed cheese head screw
 Phillips H
 ISO 7048
 SN 213307