I found this resource:
Fastorq Boltcalc v1.0b -Online Bolting Calculation
http://www.fastorq.com/boltcalc-online/boltcalc.php
Bolting Definitions
http://www.fastorq.com/resources/defs.cfm
* Bolt Preload Calculation-Theory and equations for computing bolt installation prestress.
* Criteria for Preloaded Bolts -Requires approximately 19 seconds to download. Contains equations for bolt stress analysis, including installation prestress and margin of safety calculation.
* Fastener Design Manual- Extremely large! Requires approximately 40 minutes to download! Excellent entry-level introduction to fasteners, fastener analysis, bolt pattern analysis, and equations, but does not really explain how to include fastener prestress.
* Torque Limits for Threaded Fasteners-Requires approximately 7.5 minutes to download! Contains isolated details regarding bolt prestress but does not contain Download here
http://euler9.tripod.com/fasteners/
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