For the people complaining that cutting nails isn't standard for “dykes”,
It pretty much is a standard use, or at least used to be even back when carbon steel alloys were mostly used for cutting pliers.
Nippers, for instance are used for cutting steel wire, but also for pulling nails, and Diagonal cutters are sometimes used similarly, and the way the diagonal cutters are ground sometimes seems to be directly to enable the cutters to be used for grabbing and levering out nails etc.
diagonal cutters are also routinely used for pulling cotter pins.
There are diagonal cutters made and designed specifically for cutting soft alloys like copper and other cutters designed for cutting plastic, but these are “specialty” tools rather than your typical “hardware store” type cutters.
One issue in the USA is that most manufacturers just list an ASTM spec for their cutters and pliers( or at least used to) and almost nobody, including professionals in various industries know what the specs of the ASTM standard are.
European manufacturers on the other hand tend to simply list cutting capacity for various materials, like copper, mild steel, and piano wire, which was a way more accessible way for yhe average person to just how well a cutting tool would perform at various possible tasks.
Various US manufacturers used to mark tools for high stress use with markings such as “Piano Wire” decades ago, but this is way less common now.
Klein at one point, maybe a couple decades ago at this point, came out with their 2000 series pliers,
Designed for
“Cuts ACSR, screws, nails and most hardened wire”
Since Klein was one of THE standards for US pliers, I presume plenty of users were using the pliers to cut whatever steel they needed to before this, and the 2000 series just used a better hardening process.
As for cutting drill bits, the drill bits were supposedly “HSS, and would therefore have been made to drill steel, including Cold rolled steel, piano drawn steel, alloyed steel, etc.
If a pair of diagonal cutters could cut the “HSS” drill bits, then the drill bits were the shittiest HSS possible, and the alloy likely had little to do with actual HSS.
HSS should have cracked before it cut.
High tensile deck screws are a bit of a stretch, but nowadays since screws are becoming as common as nails in construction, it’s a reasonable test to expect cutters to handle them, since you never know what morons, or those under time crunches will do with tools.
An observation I saw in the tests, is that the pliers with a courser grind on the jaws, seemed to require more force to make cuts.
As far as the CS Osborne cutters go,
Do they even make their own?
CS Osborne is apparently family owned going back several generations, and their products are a weird mix of specialty tools for Leatherwork, Upholstery, Masonry, etc.
Years ago, they used to import and sell Maun English made pliers under their own name.