g741.org

Hi Guys,

Where is the cross reference located that gives later Federal Stock Numbers for the original Ordinance Part Numbers? I keep running into newer parts for M37s and B1's that use the Federal Stock Numbers, but the ORD 9 I use to figure out the correct part numbers for my early M gives Ordinance Numbers. So there must be a way to determine which FSNs replace the older Ordinance Numbers. Where's the secret decoder ring located ????

thanks,
bob

On line (although I haven't tried it):
http://stampedout.net/odds-005-fsn.html
Gary

But what is an NCBC code number that you also have to supply? Where does that come from?

The NCBC number mentioned is what is commonly called the "country" code. It was something added to standardize NATO supply stocks in the '70s. US sourced inventory usually have a -00- or -01- whereas non-US items have other codes. For instance, United Kingdom uses -99-, Germany uses -12-, Canada uses -20- & -21-, Australia uses -66-, etc. This way you can look at the NSN and figure out which country uses that item.

Most all the M37 stuff will have a -00- in the NSN since most of it was introduced before 1974.

What I have found that works for a "rule of thumb" most of the time is taking the Ordnance PN (ex. 7371234), breaking it into two groups, a 3 digit & a 4 digit group (ex. 737-1234). The hard part is guessing the correct FSC (Fed stock class), the first 4 digits of the FSN. This number is based off the item descriptor (ie., hardware can be 53xx-, M37 specific can be 23xx, etc.). Add the -00- and I can usually match a modern NSN. The 1960 editions of the parts manuals did a good job of including the FSN with Ord PNs. Sometimes I can find it at the DLA NSN Lookup by just using the 7 digit Ord PN if there is an equivalent item still in the inventory.