Burnham
Woods walker
Have to hold on tight...those torque numbers are finger breaking and wrist wrenching, given the opportunity.
For general info grade 12 (metric rating 12.9 )only exists on metric fasteners which is about the same as grade 8 SAE .Depends on the reference .I think one rating on 12.9 might be 175 PSI tensile while some grade 8's are 150 thou .Then again it just depends on the reference used .That said it would take a lot to break or have failure on either one .Thanks, Ed. Good to see you again as well.
Al, the bolts holding my knives are grade 12 I think. Way more marks on the heads than a typical grade 8 bolt head. My DeWalt cordless impact took them all right off though, no problem.
I work in a trade where torquing bolts is an everyday occurance. The electric, and the cordless are sweet tools, but to compare them to a pro model air impact isn't even apples and oranges. 1300 ft pounds doesn't exist on a 1/2" drive. It does exist on a 1" ir air wrench, that weighs 30 pounds, and costs over 1000 new. I understand how they are rating them, and that yes they might momentarily come close to that number, one time in the tools life. But that is not an accurate comparison. If they hit even 3/4 of that torque, there would be no need for professional impacts, and every mechanic shop in the country would use them instead of shop air.
Dave, depending on how old or abused your air impact is, it might need a rebuild. It's not too hard to do, and if you have a good impact, will make it brand new again. Another trick is soaking it in kroil oil. If you aren't quite to a rebuild, that can help a ton. Adding an automatic oiler too is the best thing you can do for an air tool