Wondering why my site ranks well for one page and not another.

[launch3]

Customers mainly find our site from searching very specific part numbers on google. My site is launch3telecom.com.

Take for example these two parts:
MT500A-81015 MR050-81045

Search only those parts in google - we rank 3rd for one of them and don't rank at all for another.

Is there any way to check backlinks pointing to those pages? We even show up before big sites like ebay and such on one of them.

Can anyone help me understand this?

[Copstead]

David,

Log into GWT, and under "Site configuration", select "Settings".  There you will see that you can select your Preferred domain.  (www or non www)

From Google: If you specify your preferred domain as http://www.example.com and we find a link to http://example.com, we'll consider both links the same. Learn more about setting a preferred domain.

[launch3]

In GWT there is no preferred URL set, and a couple months ago, I started redirecting www to non-www. Should I do this differently?

[Anthony_NorthSEO]

One word... competition.

I act as 'Director of Marketing' (aka SEO/Graphic Designer) at a small tech company that specializes in Cisco networking equipment. I can tell you from experience that small variations in part #s like these can have a huge amount of variation when it comes to the competitiveness of the keyword.

For example,

CISCO1812-SEC-K9 Extremely Competitive

CISCO1812-SEC-K9-P Not Very Competitive at all.

This is an example, and I probably have the part #'s wrong, but basically one is the power adapter, and one is the actual $2500 router. Your competitors are likely concentrating on the products that have the highest profit margins.

Part # searches for hardware have a very good conversion rate, as this is usually what a potential customer will search for after they've decided what piece of equipment they want or need, and are trying to find the best price. So the fact that you're ranking above high authority domains for certain part numbers is awesome, but more demand and higher margins for a specific part will naturally lead to more competition.

Could also be other factors like backlinks and keyword density, just like Donnie mentioned. It's hard to tell without  competitive and search analysis for those keywords.

[Copstead]

You must have recently setup your www and non www canonicalization right?  This may be the reason, since both of the pages have no OSE (Open Site Explorer) info for the non www version, but do have equal metrics for the www version.

If this is the case make sure you work with GWT and take care of this.

[SEODinosaur]

Every page on your site will rank individually for keywords. These two product numbers you have listed are not being competed for. Google has piked up these numbers from wherever they can find them. Perhaps you have these codes (phrases) mentioned more times or someone else is mentioning you to be the place for that code. In reality there are 200 factors that help a keyword rank on a SERP.

If you want to check your backlinks, and since you are a PRO member you can do so here:http://www.opensiteexplorer.org/

This is a part of SEOmoz and they have other tools that are available to assist you. http://www.seomoz.org/tools