They are really hard to drive, that's what they are.What is a "E" rivet? Military Standard MS20470E5-6 Aluminum Universal Head Rivet, Solid - 1 lb
Edit: looks like 41K shear. Not interested. MS20470E6-16 Rivet - length 1 inch
E rivets are make of 7050, They were supposed to replace DD's in situations where heat-treating would be a problem, such as field repairs.
Sorry guys... I'm an enginurd...
Readily available material downloadable for free...
A very useful list.
IF You have a countersunk hole... but no suitable/matching flush head rivet... what is a solution?
I don't think I ever encountered that problem. Always had a good supply of rivets. However, one could shoot the rivet so that the tail fills the countersink, assuming you have room on the backside for your rivet gun.
For any given rivet gun what is normal/nominal practice for selecting a suitable bucking bar?
Sometimes one is limited by space, in which case use whatever you can get in with. My favourite bucking bar, before discovering tungsten, was a bar about three inches square, inch thick, with about a 45 degree angle on one side. Good for about 75% of situations. It probably weighs a little a pound. My new favourite is a tungsten bar about 2 1/2 inches square and 3/4 thick with one side angled. Weighs twice as much as the steel bar. Tungsten bars are expensive, but worth every penny, especially if it is your livelihood, As for your question, I have a massive six pound bar that is great when you need to use a 9X gun.
I have seen this chart before, and frankly, I think the recommendations are on the heavy side. Firstly, unless you have a wide-open backside, bars of those weights are big and bulky, and secondly, there are going to be lots of places where you just have to use what fits, irregardless of the weight. Just an aside, those big, bulky, bucking bars are easier to drop, and dropped bucking bars often leave a divot if they happen to land on a skin.
I have one like that, also. it's very versatile. Ya gotta love tungsten bars.I use this 2lb tungsten bucking bar for almost everything 3/32 & 1/8.