http://www.cadfly.com/page_drilltap.shtml

http://www.wooddesign.bc.ca/convert.htm

http://www.ogsrlibrary.com/conversion.html

http://www.engga.uwo.ca/machineshop/conversions.htm

http://www.kramerusa.com/DrillTapChart.htm

http://www.burtlumber.com/id36.htm

http://www.dlhill.com/units.html

http://www.offroaders.com/info/tech-corner/reading/hex-markings/hex_head_bolt_markings.htm

http://www.day-tripper.net/infoconversions.html

http://www.ajforsyth.ca/

http://www.machineryandequipment.com/scripts/Conversion.asp?ID=11&Cat=Gallons%20Imperial

http://www.wolinskyweb.net/measure.htm

http://www.metalshorts.com/swf.htm

http://international.neded.org/metric.html

http://142.206.72.128/cyb99H/sec00/about/metric-e.htm

http://www.mc2-ice.com/popular_conversion/popular_conversion_files/steel/weights_of_structural_steel.htm

http://www.machined-castings.com/Links/links.html

http://www.buildingcatalogue.com.au/infotables/steelweights.html

http://drykiln2000.com/ship/tables/measures/tables.htm

http://www.korit.com/tapndrill.htm

http://www.crowntool.com/catalog_pages/c43_tap_chart_including_proper_drill.htm

http://w3.one.net/~shender4/thread_chart.htm