Welcome to the fastenersources.com Engineering Data Section! Here you can find terminology, reference tables, design features, guides and engineering data and a variety of other material related to fastening and fasteners courtesy of fastener distributors, manufacturers, and other fine resources. Technical Engineering Data Nut and Bolt Stress Calculator by Bolt Planet Maryland Metrics Technical Information - Courtesy of Pivot Point Principal Metals Bolt Science Base Element Index DIN & Other Fastener Illustrations Bolt & Screw Heads Screw Points UNSPSC — Universal Standard Products and Services Classification Code Chemical Composition - Steels, Alloys and Stainless Gauge Decimal Equivalents For Accuracy, Specify by Decimal - Not by Gauge Hardness Conversion Table - This table provided courtesy of Safety Socket. Identification Markings on Bolt Heads ASTM and SAE Standards Screw Thread Limits - This table provided courtesy of Safety Socket. Wire to Decimal Equivalent Table Drive Recess Licensees - A comprehensive listing of drive recess licensees, provided by Phillips Screw Company Fastener Reference Charts - Provided by Judge Marketing Inc. Fastener Technical Information - Provided by QSN Manufacturing Cut Fastener Costs - Basic rules for maintaining high quality and cutting fastener costs Technical Information and Data Index - Provided by Maryland Metrics TechCenter - A comprehensive technical data center to help you make more informed decisions about your metal and fastener applications. Provided by R.J. Leahy Company. Technical Reference Charts - Courtesy American Fastener Technologies Corporation Short Cuts to Better Spring Ordering GSFC Fastener Integrity Document Rivet Dimensions - Courtesy Jay-Cee Sales & Rivet, Inc. Specifications for Structural Joints Using ASTM A325 or A490-LRFD Specifications Commentary Appendix A