Readers will find several PDFs such as the one titled Bolt Reactions HandCalcs.pdf at MachineDesign.com/MD/bolts. The files contain detailed hand calculations with arithmetic for the models in this series. The files are also available from Dearth at AppliedAT@aol.com. FEA models, RigidMdl_BoltReactions_v2004.mod and FlexMdl_BoltReactions_v2004.mod, are small enough to process using limited-node or demo versions of MSC/Nastran v2004. To obtain a free copy of the limited-node software, log onto: mscsoftware.com/offers/master/contact.cfm or telephone MSC Software at (866) 672-1549. However, the files will also work in any version of Nastran.