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I would most definitely write it out as inch & inches and even in. when necessary. A simple Google search for intitle:48" will show you that Google ignores the inch mark on this search. Another search of intitle:" shows no results. Any search I can find using "inches" does not return a result with " in the title.A simple search for most keywords with synonyms or alternate versions shows the synonym or alt version in at least some pages. Inches does not. (Dinner shows dinner, dining & diner. Autos shows results for cars. Inches does not show " and a search for 10" shows results for 10, not "10 inches") So yes, I would use the full words in this case.

In the product areas where I sell, I doubt that anyone uses the word "retail" when typing a query.   A few people who are resellers or who want to be large quantities will search with "wholesale" or "bulk" in the query.   So, I do not feel a need to do special optimization for the retail buyer. Information that would help me make the decision on adding "wholesale" or "bulk" to a title tag are.... A) How are people searching?  You can get some information on this from the limited number of keywords that show up in your Google Analytics reports, or whatever other analytics you use.   Also, some information can be obtained from word tracker.  How people speak to you when they call on the phone can be useful. B) How are your competitors optimized?  If none of them are optimized with "wholesale" in their title tags then you can probably get away with not including it in the title  but adding it to the description and making it obvious on the page. C) Laws in the state or country where you are selling.  In some jurisdictions there are rules for using "wholesale" in your advertising. I sell some items that are used in crafts and my buyers are split between people who buy an ounce and those who buy a hundred pounds or more at a time.  There are only a couple  genuine "wholesalers" in the USA who refuse to sell to any person who is not a retailer.  To buy from them you must spend a lot more than my typical customer would ever want. Thankfully, they have not optimized their site with the word wholesale. So, I don't optimize as "wholesale".  Anyone who searches for  my items with "wholesale" in their query will find no other websites that are a genuine matche.  I simply optimize my pages for the material that is being sold. My pricing to everyone is "retail" but if you buy a lot you pay a much lower price per pound.   I sell to anyone without regard to the size of their order or their status as "consumer" or "retailer" or "manufacturer"  at the same prices.    These materials are sold on my site in small quantities that the typical consumer would buy and in bulk quantities that would only be purchased by resellers or manufacturers. The only problem that I have with this are people who see the prices on my site and think that I have secret prices for resellers, schools, churches, manufacturers, etc.  I simply tell them that we sell to everyone at the prices published on my site.  There are also the "hagglers" who think that published prices have no meaning or don't apply to them.  I don't haggle because it is a game that cuts profits and wastes time.

To add to Patrick's great response, this page describes what you are seeing. When you try to go to a page on your site that does not exist, you seem to correctly get an error page. But the content of the page does not necessarily reflect the HTTP response returned by the server. Your server is saying that the page was found, although the content of the page says it wasn't found. [A 404 response from the server simply means Not Found.] If you look in your Google Webmaster Tools under Crawl > Crawl Errors you will see a tab called Soft 404. A soft 404 is a page that says it is not found but is not returning an actual 404, not found, response. [I always wondered how Google could tell--I was given the answer that if Google sees that a whole bunch of different URLs bring up the same page, which does not return a 404 response, it assumes that that page says it is an error page and labels it a soft 404.] If you want to test whether a URL on your site is correctly returning a 404, you can use Fetch as Google to see if it returns Not Found or else there are a number of free server response checkers online.

Thanks so much for all if this wonderful info! I am actively working on all of these items! I'll let you know