Mechanical Design:

• Guidelines for Mechanical Design and Analysis
• NASA STEP Central
• LHB 7320.1 Engineering Drawing Standard
• MIL-STD-100 (referenced by above LHB)
• Drawing Requirements Manual (complies with MIL-T-3100 & MIL-STD-100E), by Jerome H. Lieblich
• Parker O-ring handbook (O-ring seal design)
• NASA Reference Publication 1124 (Outgassing measurements)
• ASME Boiler and Pressure Vessel Code (Pressure vessel design)
• A Manual for Pyrotechnic Design, Development and Qualification, NASA TM 110172, Laurence J. Bement et. al., June 1995.

CAD:

• PTC
• Guidelines & Tips for Design in Pro/Engineer
• EDB Drawing Standards
• SDRC
• Unigraphics

Bolted Joints (and torque coefficients for fasteners)

• "Systems Engineering Bolted Joint Handbook," SED Engineering Handbook EHB-2, November 1990, NASA Langley Research Center.
• "Experimental Determination of Torque Coefficient Values for Metric Fasteners," Cheryl C. Jackson (now Cheryl J. Tyler), 1992 (unpublished).
• "Fastener Assembly Handbook, An Aid to Better Performance with Fastener Assemblies in Industrial, Construction, Transportation, and Automotive Applications," Premier Industrial Corporation
• An Introduction to the Design and Behavior of Bolted Joints, by J. H. Bickford

Other Design References

• Engineers' Edge - Design Resources
• Guidelines for Engineers, Visualization, Communication and Design by Randolph P. Hoelscher, et.al.
• Machinery's handbook, Industrial Press
• Strength of Materials by S. Timoshenko
• Aircraft Structures, by D. J. Perry
• Design News issues
• Machine Design issues
• Vendor catalogs