Stanley bolt thread alternatives?

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Forum topic by luthierwnc posted 01-12-2016 10:06 PM 647 views 0 times favorited 5 replies Add to Favorites Watch
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146 posts in 1799 days

01-12-2016 10:06 PM

Hi All,

I’m rehabbing a Stanley No. 10 1/2 with an adjustable mouth. The mouth casting is tapped to accept the standard 12-20 sized threaded rod but it is also the typically sloppy fit. The iron washer is tapped the same but a bit tighter.

I don’t know how much I’ll move the toe but I’m concerned that so much play in the fit (together with only using a few threads) will put a lot of stress on that casting. Since this unit won’t be inducted into the Plane Museum, I’m inclined to chase it with a 1/4-20 or 28 tap and use more conventional hardware.

If anyone has a better idea, I’d like to hear it. Thanks, Skip

5 replies so far

View Don W's profile

Don W

18754 posts in 2590 days

#1 posted 01-13-2016 01:31 AM

If it tightens, I’m not sure I understand the concern? Almost all of the threads in the vintage Stanley’s are a bit sloppy and they’ve faired ok for a long time if handled with care.

-- - Collecting is an investment in the past, and the future.

View bridgerberdel's profile


50 posts in 1265 days

#2 posted 01-13-2016 05:15 AM

Pick up a 1/4-20 split die. You can squeeze it down to 12-20 (I had to open up the slot on mine a bit with a dremel). You can also squeeze it down partway to 12-20, however much is necessary for the snug fit you seek.

-- occasional musings on my blog:

View luthierwnc's profile


146 posts in 1799 days

#3 posted 01-13-2016 07:27 AM

Dow W; it just seems to be a weak situation Stanley gave up on. Even my modest No. 18 has a 1/4-20 bolt holding the mouth in place. Now that I think about it; there are some people I wish had 1/4” bolts holding their mouths shut too. I’m a little curious how Stanley was able to get a 7/32” thread width from a 3/16” rod. I’m not a machinist but I suspect the pitch depth on the male side is deeper than the female to give it that characteristic wobble.

bridgeberdel; thanks for the idea. My dies are all solid round so I’ll have to weigh the options. I’d have to turn some 1/4” steel down to fit as well. Victornet (sp) has a hundred dies listed but the 12-20 is the only one out of stock. People must be fixing their planes. sh

View Tim's profile


3812 posts in 1984 days

#4 posted 01-13-2016 05:30 PM

You have to look at the special pitch dies and taps on their site.
Here are the links:

I found those links and contributed them to WayneC’s list, but I have no experience with Victor so I can’t vouch for them. Here’s Wayne’s list with two other options:

View luthierwnc's profile


146 posts in 1799 days

#5 posted 01-14-2016 01:07 AM

Except that is the one and only die that’s out of stock. That happens to me at the hardware store too. sh

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