This link will get you to Caterpillar's hardware book........sometimes you need a fastener that has to have more strength than SAE Grade 8 or maybe a particular head or shank. They are not cheap and sometimes their desk clerks are a pain in the backside (what machine type and serial number do you have sir?). I have however, gotten otherwise unavailable stuff from them at locations all over the planet (Australia, South Africa, Mexico, Namibia, Chile, Peru, etc.) Oddball metric socket head capscrews that they literally got over night ....almost a miracle sometimes........

http://www.cat.com/cda/layout?m=37648&x=7

use the "Hardware Reference" PDF

 
 Steve Metzger       Tucson, Arizona