Lauched September 25, 1997, STS-86 was the 87th flight of the Space Shuttle (the 20th for orbiter Atlantis) and marked the seventh docking with the Mir Space Station.

The attached washer was installed with an EWB0420-8-20 bolt as part of the SPACEHAB double module flown on STS-86 to support the transfer of logistics and supplies for Mir and the return of experiment hardware and specimens to Earth.