The Strongest Barbell Rogue Fitness Makes
The whole barbell strength thing is way over rated. Any decent powerbar is going to be more than strong enough. We as lifters mainly care about specific traits.
Squat bars are thicker, stiffer, the sleeves go out further so you don't have to worry about clipping the rack when you take your first step back. They have a much wider and more aggressive center knurling for more surface area on your upper back. They are 55lbs so that they can accommodate these features.
Deadlift bars are quite a bit longer, they are NOT stiff, they are meant to provide whip, they are slightly thinner than a standard power bar, and they have extremely aggressive knurling for maximum grip (it will literally rip your hand open). Some are made specifically for the sumo deadlift.
Bench bars are basically a lot like squat bars. 55lbs. Knurling is a bit different. Extremely stiff. Made for 700-1000lb benchers.
Powerbars are a jack of all trades. In most federations we use a good power bar (texas power bar) to bench press with, and not an actual bench press bar. They are more obscure and mostly for equipped lifters putting up outrageous numbers.
Olympic bars are the most expensive because they use needle bearings and most of them are either stainless or hard chrome. Knurling is less aggressive then basically all the bars i listed up above. The bearings and finish are where the price tag comes from.
All of them from any quality manufacturer have a higher strength rating then anyone of us ever need.
Just thought yall might find some of this interesting because i know a lot of yall are used to commercial gym equipment. Whats funny is most of the big name commercial gym manufacturers make good products, really expensive stuff, but they make less than decent barbells.