the topic is too big - no specifics, therefore it is hard to answer. 
press fit - mating surface materia compatibiity, intended desing mating
cycle, hardness and vibration concerns, service life, etc.  board support,
resonance development, thermal energy (thermal cycle) relief, stack
tolerance, spring force of the connector, designed max/min contact
resistance (high voltage or low voltage). best usually is expansive, you
get BOM item stand out 1st of the bean counter try to cut cost use some
cheap one instead.  the advice usually is, find good vendor pair - and
stay with them.  don't forget, low voltage may draw corrosion product if
you are not clean.  poor plating causes underline metal migration to the
surface via porosity or exposed edge of the pads, (especially, cheap one
uses gold as plating mask), after THB, you might end up alloy surface
instead of intended mating stack.  yes, it is pain and you need to read,
read and many lesson to learn (if you find them).
my 1.5 cents.
     jk
> I feel the pain......    There is not relief in sight.....
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
> Sent: Tuesday, April 12, 2016 7:26 PM
> To: [log in to unmask]
> Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
>
> I have been asking the same questions even directly to the press-fit
> manufacturer themselves and there is no conclusive answer. Except to drown
> myself in the piles and piles of information from their website and often
> end up going round and round.
>
> To quote from Gerry : " Godd hunting"
>
> Regards,
> ~wee mei~
> ________________________________________
> From: TechNet [[log in to unmask]] on behalf of Gerry Gagnon
> [[log in to unmask]]
> Sent: Wednesday, April 13, 2016 1:55 AM
> To: [log in to unmask]
> Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
>
> Hi Victor,
>
> Second time is the charm.
>
> Press fit pins are highly engineered and have many specifications
> associated with them.
> Each press pin manufacturer's design tends to be unique as a lot of them
> are patented.
>
> The best answer to your questions is to tell you to find out the specific
> press pin manufacturer's part number for the pin that you are dealing
> with, go to their web site, and get the drawings and specifications for
> the specific pin you want to know about.
>
> I think you will be surprised at the level of detail you will receive for
> your questions plus the attributes you have not asked for ....... yet.
>
> Good hunting.
>
> Gerry
>
> ________________________________________
> From: TechNet on behalf of Victor Hernandez
> Sent: Tuesday, April 12, 2016 11:59 AM
> To: [log in to unmask]
> Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
>
> Fellow TechNetters:
>
> My initial inquiry, 2011, did NOT yield any useful information. Therefore,
> I pose the same question again in hope that additional reader will provide
> comments and/or their experience with Press Fit Pins.
> I look forward to hear from the readers.
>
> What is the acceptable depth of the main eye lid with regards to total
> board thickness? I have seen a variety of depths used.
> What is the preferred raw board surface finish? Again, I have seen a
> variety.
>
> Victor,
>
> From: Garcia, Rigo (GSFC-370.0)[ARES CORP] [mailto:[log in to unmask]]
> Sent: Wednesday, January 27, 2016 11:28 AM
> To: Hernandez, Victor G
> Subject: RE: Press Fit Pins guideline
>
> Thanks!
>
> Rigo
>
> "The future belongs to those who believe in the beauty of their dreams" -
> Eleanor Roosevelt
>
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Wednesday, January 27, 2016 12:21 PM
> To: Garcia, Rigo (GSFC-370.0)[ARES CORP]
> Cc: [log in to unmask]
> Subject: RE: Press Fit Pins guideline
>
> Rigo,
>
> I did NOT get any concrete guidelines and/or specification for Press Pin
> Fit leads. The specs that are out there are confidential.
>
> Victor,
>
> -----Original Message-----
> From: Garcia, Rigo (GSFC-370.0)[ARES CORP] [mailto:[log in to unmask]]
> Sent: Wednesday, January 27, 2016 11:08 AM
> To: Hernandez, Victor G
> Subject: RE: Press Fit Pins guideline
>
> Hi Victor,
>
> Did you get an answer to your question?
>
> I'm interested because we are looking into qualifying press fit connectors
> for flight hardware and don't know of any specs that provide requirements
> for the process.
>
> Best regards,
>
> Rigo Garcia
>
> "The future belongs to those who believe in the beauty of their dreams" -
> Eleanor Roosevelt
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> Sent: Monday, January 25, 2016 1:40 PM
> To: [log in to unmask]
> Subject: [TN] Press Fit Pins guideline
>
> Fellow TechNetters:
>
> What is the current IPC guideline/specification for insertion depth of
> Press Fit Pins. I aware that the Press Fit Pins configuration might vary a
> little, just as well as board thickness. What is the acceptance criteria I
> should look for visually and during x-ray imaging.
>
> Victor,
>
>
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