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SRB Hold-Down Post Frangible Nut Mission: STS-31 Discovery   Crew: Loren J. Shriver Charles F. Bolden, Jr. Steven A. Hawley Bruce McCandless II Kathryn D. Sullivan Launch: April 24, 1990   Landing: April 29, 1990   Duration: 5 days, 1 hours   Comment: Deployed the Hubble Space Telescope This half of a hold-down post frangible nut was recovered on April 24, 1990, after it rode with one of the Solid Rocket Boosters (SRB) launching the Hubble Space Telescope on Discovery. Each SRB has four hold-down posts that hold it and the launch platform's posts together. Each bolt has a nut at each end but only the top one is frangible. It has two detonators, which are ignited at solid rocket motor ignition commands. When the detonators go off, the nut halves are caught in a blast container. back to Artifacts © 1999-2008 collectSPACE.com All rights reserved. Questions? E-mail contact@collectspace.com