Specifications

PCIe/104 and PCI/104-Express Specification Revision 3.0 February 17, 2015 Page 56
6.4. Standoff
Standoffs are used to ensure stacked boards retain their connectivity. The standoffs are preferably made from stainless-
steel to provide for maximum strength and height tolerance. Pads must be provided for the standoffs, with the same
plating as the pads for the PCI Express connectors.
All critical dimensions are listed. It is up to the user to define the thread type. The height of the standoff shall be 0.600
inches ±0.005 inches (15.24mm ±0.127mm).
Optionally, 22mm standoffs are to be used with the optional 22mm connector and they shall be 0.866 inches ±0.005
inches (22.00mm ±0.127mm) all other dimensions remain the same.
The width of the standoff must be able to fit on the Standoff pad called out on the Board Layout & Dimensions Section.
The width of the threaded section must be able to fit into the standoff pad hole called out in the Board Layout &
Dimensions Section.
0.600 ± 0.005 inches
(15.24 ± 0.127 mm)
< 0.125 inches
(< 3.175 mm)
< 0.250 inches
(< 6.350 mm)
Figure 6-18: Standoff Mechanical Dimensions