Back to some of the strange “Manufacturers” on the Manufacturers' Symbols lists…
”, for Chevrolet Motors Division of GM, appears one time in the SNL J-4, with part number “CV-3679161” being cited as a specification for 41-S-1117-8, which is a common, normal duty, clutch head screwdriver with 8” blade and 3/16” screw size tip. This is not a G506 screwdriver, but I haven’t cross-checked it with any other SNLs. As I said upthread, an Apex code is cited for several clutch head screwdrivers of various sizes. In this case it looks like the ORD is saying, 'whichever Mfgr(s) are making the clutch head screwdriver that Chevy is using in one of their trucks, under this part number, is good enough for us as our spec.'
for Pratt and Whitney is actually a different case, I think. It looks like they had a major machine shop, for production. Whether it was internal and external, I don’t know, but the ORD 5 SNL J-2 cites many of their part numbers for taps, dies, threading sets, etc. I glossed over all that until now.
Did you see the “Submarine Mine Depot” (SUB
) on the list in the back of the SNL J-4? That is not a commercial entity. It was a US Navy activity at Fort Monroe, VA. So the Navy is cited as the US Army Ordnance specification for 41-W-977, which is a set of fifteen (15) DOE engineers wrenches, normal duty, alloy steel, with 15-degree angle heads, including several G503 sizes!
(So much for inter-service rivalry!)
Staying with DOEs, here is a page that I had already taken a photo of, meaning to add to the “Fairmount Catalog” thread that Phil Jones started, in which we were discussing alloy and carbon steel wrenches.
There are several pages of DOEs in front of this one, starting from the smallest opening sizes. All of those wrenches are specified as alloy steel. But you see how it switches to carbon steel when it hits the larger sizes? (At wrench 41-W-1065-40, TKKX7B, 1-1/8" x 1-1/2", to be precise.) I found that pattern interesting, especially given our knowledge of Williams, Bonney and others making carbon steel wrenches in all sizes.
Anyway, this page is also handy to illustrate some of the comments I made above about the “Specification” column...
You see the wrench with the Williams (WMS-39A) spec? As far as I have checked, most of the major mfgrs of engrs wrenches made this size wrench. It's an odd size, but no odder than others with odd sizes, and if there’s something special about Williams for this particular wrench, as opposed to the size before or after it, one would be hard pressed to explain. So in some cases the use of a Mfgr as a spec is rather benign. Why they would have an Ordnance “taxi” number (type of Ordnance part number) for most of the DOEs, but not that particular one, is also puzzling, but in cases like this, when they apparently did not have an Ordnance ES, part, or “taxi” number to cite, it looks like they picked an industry leader.
I will post a few more example pages next week.