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12 tpi bolts info for older wood working machines

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Forum topic by Holbs posted 09-16-2015 08:20 PM 780 views 0 times favorited 9 replies Add to Favorites Watch
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Holbs

1383 posts in 1497 days


09-16-2015 08:20 PM

For those with non-American machines or older machines, you may come across the older bolts that use 12 threads per inch instead of the more in-use 13tpi, based on the British Standard Whitworth prior to going to the metric system. I am refurbishing a Taiwan made 2001 8” GeeTech jointer and was missing hand wheel bracket bolts of 1/2”-12(NC)-1 1/2” (I think the NC means national coarse standard, back in 2001 in Taiwan). I “almost” just plowed ahead and sought parts from a new Grizzly 8” jointer, which would of been a bad mistake because newer jets, powermatics, grizzlys use metric bolts (M10, M12, etc) instead of my 2001 era jointer.
To make matters worse, finding a source for 12tpi bolts is a needle in a haystack. After 3 days of Googling, finally found a place that had at least 4 in stock. British Tools and Fasteners out of Lyon, NY. $1.50 each bolt + 2 day USPS shipping. whew. Was getting scared that I would have to order from Taiwan for $200 + wait 2 months for shipping!
So for those with non-USA or older machinery, if that bolt or nut does not exactly thread correctly, you might have the Whitworth thread and not the Metric or SAE thread.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"


9 replies so far

View jonah's profile

jonah

687 posts in 2766 days


#1 posted 09-16-2015 09:05 PM

Whit worth bolts play a prominent role in Pixars Cars 2. I didn’t realize they were in use until so recently.

View Rick M's profile

Rick M

7935 posts in 1848 days


#2 posted 09-16-2015 09:36 PM

I would have drilled it out and installed a helicoil.

-- http://thewoodknack.blogspot.com/

View Holbs's profile

Holbs

1383 posts in 1497 days


#3 posted 09-16-2015 11:25 PM

I considered helicoil (never done such), but the kit to purchase was $20 + the new bolts anyways.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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jonah

687 posts in 2766 days


#4 posted 09-17-2015 12:34 AM

If your Geetech has these funny bolts, I’d be willing to bet my mid-90s Taiwan-made Enco jointer has them as well. Here’s hoping I never need any new bolts.

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Holbs

1383 posts in 1497 days


#5 posted 09-17-2015 01:10 AM

Jonah… as I read at least for jointers, late 90’s early 200’s, all major jointer manufacturers built them at a single Taiwan facility (jet, powermatic, delta, off-brands). I am unsure if this applies to planers, bandsaws, table saws, etc.
Also, I bought this jointer at an auction with missing parts, hence my pursuit of replacing those parts.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View Roger's profile

Roger

19886 posts in 2272 days


#6 posted 09-23-2015 04:01 PM

Thnx for the link Holbs

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. Kentuk55@yahoo.com

View Ocelot's profile

Ocelot

1471 posts in 2106 days


#7 posted 09-23-2015 06:55 PM

I’ve seen a place lately (somebody on this site mentioned it) that sells non-standard taps and dies. You could just buy long bolts (the ones that aren’t threaded all the way), cut off the threaded part and then re-thread to whatever you need. If I recall, however, it was about $10-12 + shipping per die.

So it’s Victor Machinery Exchange

Look under one of the “Special Pitch Dies” pages for the size range you need. The first page goes up to 1/2”

The one you would need is 1/2-12.

You can pretty much get whatever you want there.

View BigYin's profile

BigYin

347 posts in 1884 days


#8 posted 09-23-2015 08:48 PM

Try BRITISH ebay thats http://www.ebay.co.uk/ there’s lots of UNC, UNF, BSF, BSW bolts, taps,dies etc
the postage overseas may make you cry…

-- ... Never Apologise For Being Right ...

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Holbs

1383 posts in 1497 days


#9 posted 09-25-2015 10:29 PM

the British Tools and Fasteners are in New York with simple 2 day delivery. Can’t beat that :)

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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