First off, what you're showing there as examples are file names, not titles.
The title tag is
important for SEO. You want the title tag (in the head portion of your page code) to reflect the contents of the page. If the page is about an SAE bearing (or whatever), then the title should have those words in it.
As long as each page has something different on it, the title (being specific to the contents of that page) will be different. It's not a problem if the titles have some
words duplicated, as long as those words are actually relevant to the contents of the page.
The search engines WANT titles that are relevant and reflect what's on the page. They don't expect you to leave out relevant words or start making up weird synonyms.
Page file names, on the other hand, are less important. Not that they don't count at all, but they're just not as big a factor as the page title.
And, again, the search engines are not going to have a problem if your page file names duplicate some words, as long as the words are relevant to the actual content of the page.
As a rule of thumb, any time you find yourself doing something that doesn't make sense, something that you think makes your site worse
simply "for SEO purposes," it's something the search engines don't want you to be doing in the first place.
There are an awful lot of people out there peddling an awful lot of hokum in the name of "SEO." Most of them are just parroting a half-understood version of something they read somewhere and have never tested anything for themselves. And in many cases what they read was simply somebody else parroting something they
read (and probably only partially understood) from somewhere else. And so on and so forth, stretching back for years.
Bottom line, there's a lot of misinformation, outdated advice and just plain crap floating around out there, and a lot of really TERRIBLE advice.
Do what's really, truly, honestly best for your human visitors and you can't go wrong.
If you haven't already, you might want to check out this SEO Guide from Google: http://support.google.com/webmasters...n&answer=35291