A fastener used in a blade server to secure a thermal module and a
motherboard to a metal face panel, including a cushion member set between
the metal face panel and the motherboard, an elastically compressible and
electrically insulative spacer member set between the motherboard and the
thermal module, a lock member fastened to the cushion member and the
spacer member to lock the motherboard to the metal face panel, a locating
member fastening the thermal module to the spacer member, and a spring
member mounted on the locating member to keep the thermal module in close
contact with a chip at the motherboard. The spacer member automatically
adjusts the tightness between the thermal module and the chip at the
motherboard, and isolates the digital grounding loop formed in the
locating member and the thermal module from the analog grounding loop
formed in the lock member and the metal face panel.