TPI Count for C&P Fasteners

Everyone,

I’ve assembled a press that I’ve recently bought, and it appears that it is missing two fasteners—the two that attach the throw off bracket to the left side frame. They are approximately 1/2” x 2”. The throw off lever “screw” as it’s called in the parts catalog threaded into the hole in the frame just fine, so I used that as a sample and took the fastener to the local specialty bolt store.

However, it appears that this fastener is 12 TPI, and not 13 like standard 1/2” bolts. Has anyone run into this before? If so, does anyone have some extra bolts they can send my way, or point me towards where I can find a few?

Link to the C&P New Series Parts PDF for reference.
https://d1mkprg9bp64fp.cloudfront.net/wp-content/blogs.dir/2/files/2012/...

Many thanks, Gerald

Log in to reply   12 replies so far

C&P parts predate SAE standardization, so there are some bastard threads, like 1/2”-12. You might find the same in a Linotype or its spare parts box.

Very likely British Standard Whitworth.

If it is really 1/2”-12, then prob have to make on a lathe. 9/16” comes in a 12 pitch.

As a note, this press is a C&P 8x12 New Series, from 1924. So as late as ‘24 they were still using 1/2” 12tpi. I am curious if anyone has a later 8x12 to see if they’re still using those fasteners.

I reached out to our local graphic arts machinery shop, and they were familiar with what I needed and offered make a set. I ordered extras, just in case, should anyone find this post and need fasteners as well.

I will update in a few days to let everyone know how it went.

It is 1/2-12. These are still available, as are taps and dies. Most US. British and European machines built in the first half of the 20th century used 12s. Today most marine shipping crates specify them. They are easier to spin on. The 12 emminates from Whitworth but sans the crowned thread. Any good fastener supply can supply these.

www.pressxchange.com/en/howard-screw-feb20/ is an article that may shed more light on the discussion.

Thanks Nick. Very interesting information in your comments above, as well as in your article on www.pressexchange.com. I was not aware that the fastener situation was that involved and complicated.

Many thanks Nick, and also thank you for sending the link to the article-that’s most helpful.

I have question for you, if you happen to know. When does C&P change bolts over to standardized bolts? This press is a New Series, from 1924. So they must not have standardized when they made the New Series a decade or so earlier. So at what point (if at all, 1924 is the newest platen I’ve had) do they change over? It would be nice to know just to say “hey, if your serial number is less than this number, you probably have 1/2” 12tpi fasteners.”

Thank you again, in any case.

This is Ancient History, but issues such as this one are the reason why, when writing to Chandler & Price (or other manufacturers), they requested the serial number(s) of the unit(s) that the parts were for, as changes WERE occasionally made. Unfortunately, their records are long lost, unless someone (probably in Cleveland) had the pack-rat foresight to latch onto them. If so, then I would like to know whom, to congratulate them on their foresight.
Frank.

Teikaut, how did things go with your local graphic arts machinery shop ?

Winfred Reed
Black Diamond Press (Kentucky)

Got the bolts, took a while but they were exactly right. Guy that turned them did a real good job. It was $72 for 5 though, which is steep. I should have asked for a dozen and just ate the cost—but I’m going to see if there’s someone else that can make some for me in bulk.

The shop is F.C. Washington in Detroit, MI. They’re a graphic arts equipment repair shop.

image: IMG_4007.JPG

IMG_4007.JPG

If anyone is looking for similar BSW bolts, try this company (on this side of the “pond”):

https://britishfasteners.com/bs-whitworth-bolt-1-2-12-x-2-2002.html

John Henry
Cedar Creek Press