Where would one find PDF files with the following standards:
AN (Army/Navy), MS (Military Specification, NAS National Aerospace Standards
A google search uncovers mostly suppliers of AN/MS/NAS hardware...I want the defining documents.
Thanks,
-Martin
ANSI, ISO, SAE etc. They are not free.
Bob
I just found this:
-Martin
You need to be really be carefully here because I believe most if not all of the specs you just listed have been superseded by an AS Spec.
For instance:
AN774 canceled & superseded by AS5160 MS20819 canceled & superseded by AS5176 AN783/MS24388 canceled & superseded by AS1031
Etc., Etc., Etc., Etc., Etc., Etc., Etc., Etc., Etc.,
Tom
Another free place is at
m wrote:
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This is the first place I start! All Gov't specs (Mil, AN, MS) are free, and if they've been superseded......
Didn't know that. It just seems that most vendors are still using the designations that have been cancelled. For example, I searched for MS20426 rivets and you find tons of suppliers that use this designation rather than that which superceeded it. I guess these numbers have become terms of trade in some way?
-Martin
Great site but on the parts that have been superseded by SAE-AS standard you can only get a copy of the old specs from this site not the current ones because they are no longer government specifications. For the fitting part numbers I pointed out this site does tell you if the part has been superseded and what the new part number is. On part numbers superseded by SAE-AS they only provide the prints before they were canceled and superseded not the new current print or standard they link to
Tom
LOL...that's the rub.
Before there could be three different part numbers for the EXACT same part. People got smart, they decided to consolidate and standardize to make it "one" part number so now there are FOUR part numbers for the exact same part
For manufacturers it has been consolidated, it has been reduced to one standard, one part number, one print that covers the manufacturing of the part instead of up to three.
For Distributors & Sellers have to cross reference four part numbers because it will take a while for the customers to update their systems & documentation.
Tom
SAE do not give anything away for free :-)
When a spec is superceded by another new one the new one must be tha same or be an improvement in design or mechanical properties to the old one. This is so that when older spec fasteners are replaced with the new ones they still have the same or better form fit and function, they cannot be degraded. When a fastener spec cannot be superceded or replaced it is cancelled for new design. BTW AN960 washers have been invalid for new designs for many years but this spec is still the most popular one when buying washers. I would say its safe to use the free Mil Spec for design and call up the superceded SAE spec in the BOM.
And that's probably one of the reasons the old part numbers will never go away. If you want to convince folks to migrate to a new standard you have to make it so easy and painless that it would be unthinkable to do anything else. For just about everything I do any supplier or fabricator I deal with is perfectly at home with the old part numbers. They know what I am talking about and they can buy the components just fine from any number of suppliers who use the same specs.
Maybe I am wrong, but if SAE went throught the trouble of making the specs available at no cost, and maybe even good solid models, adoption would probably not be an issue. Otherwise, adoption of the new designations will only happen due to being forced to do so due to the nature of the work being done and just about no other reason.
-Martin
Bingo!
(Beat me to the punch as I was typing something exactly like that when your message came up, except you stated it better that what I had - heh... )
I'll just add that's why the specs are still available and called out even on new designs. You'll also notice that suppliers will certify them to both specs if there is no difference. I can't tell you how many "new" hardware specs that are out there that are scanned gov't specs with the new numbers. Makes you feel real great when you spend $50 for that and then compare them, huh? :)
IYM
an improvement in design or mechanical properties to the old one.
still have the same or better form fit and function, they cannot be degraded.
spec is still the most popular one when buying washers.
superceded SAE spec in the BOM.
Wonder if distributor/seller would send a buyer/engineer/QC a copy of the SAE drawing.
Mil-Specs were controlled by the US DOD. They were free because tax payers money was being used. They finally decided that the DOD was not in the business of creating and controlling specifications and that it was the responsibility of industry to take over.
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