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Hello all. Following up on a discussion about old/ obsolete American Standard Screw sizes… I found my reference chart for sizes from #2 to #30 . This from an old fastener manufacturing company. When measuring the diameter of the thread, remember that the thread will be a few thousands smaller that the nominal body size.
Hope it will be useful and prevent problems from “almost alike” fasteners.
Joe B
The lengths in the last column, are the standard range of lengths that this company , The American Screw Company produced.
Joe B
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Early Johnson had an odd shear pin Dia. as
well. I haven’t had any luck finding brass rod
that size.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
The screws used in the earlier Johnson rope sheaves are 10-30 screws. My South Bend lathe has no setting for cutting 30 threads per inch. My Cardiff does, but I don’t have the necessary headstock gear for it. I bought a 10-30 die from a place in Michigan for 11 dollars US. I use it to make new rope plate screws, and also made screws that work with my puller kit so I don’t have to hammer on the flywheel nut to get the flywheel off.
But here’s one for you. Check out the slotted hex-head bolts that are used to fasten the cylinder castings to the crankcase. They are 20 TPI but the major diameter measures at about 0.260″, whereas most 1/4″ fasteners measure a few thou under 0.250″. Using a regular 1/4-20 fastener is not recommended for that particular application.
Hope it helps, but it’s somebody else’s fault if it doesn’t
Best,
PM T2He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
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This is the little bugger. Luckily they don’t
get the attention that the flywheel screws do
so they are, normally, still in good condition.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
I ran across an odd size thread today, on the 1925 Elto Lightwin, model C,
on the water outlet tube that goes thru the exhaust manifold.
I had no tap or die for this one.The thread OD measured .388, and it has 27 TPI.
I didn’t even know my thread gauge has 27 tpi, let
alone hear of that thread.
Prepare to be boarded!
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