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Tool Talk Discussion Forum

Odd Socket Sizes

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Glenn FitzGeral

09-05-2005 20:26:19

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I bought a half inch standard socket set twenty five years ago which I use regularly. However in all the years I have used this set there are four sockets which to my knowledge I have never used, (nor seen in another set). They are 19/32, 21/32, 25/32, and 31/32. Any idea what these sockets are used for? Thanks, Glenn F.

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John Garner

09-06-2005 12:50:01

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Time to climb into the Way Back machine in reply to Glenn FitzGerald, 09-05-2005 20:26:19

Glenn --

In the years before World War II there were two different series of standard-size nuts used in the US, the Standard [also called Society of Automotive Engineers (SAE)] and the Heavy. The across-flats dimension of the Standard nut was 1.5 times the nominal thread diameter of the corresponding bolt, while the Heavy was 1/8 inch larger than the Standard.

This meant that any "odd-sixteenth" bolt ended up with "odd-thirty-second" nut sizes in both the Standard and Heavy series.

To work one numerical example, let's consider the 5/16 inch bolt. Its Standard nut would be 1.5 x 5/16 inch = 15/32 inch, and its Heavy nut would be 1/8 inch (4/32 inch) larger at 19/32 inch.

If you calculate the Standard and Heavy nut sizes for 7/16 inch and 9/16 inch bolts, you'll see what nuts your seldom-used sockets were intended to fit.

During WWII the use of odd-sixteenth bolts generally fell into disfavor, although the 5/16 inch size has survived fairly well to this day.

John

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Bernoulli

09-07-2005 10:51:41

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Re: Time to climb into the Way Back machine in reply to John Garner, 09-06-2005 12:50:01

I'll second that! Thanks for the excellent explanation.

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Dale in WV

09-07-2005 09:16:45

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John - that is Neat to Know! in reply to John Garner, 09-06-2005 12:50:01

I'd never heard that explanation before. Many thanks!

dale

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paul

09-06-2005 11:10:27

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

I have a plow that uses a ??/32 for the front-most plow bolt on the plowshare. I think new replacement bolts have special nuts that come out to standard socket now...

--->Paul

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petetx

09-06-2005 09:36:26

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

at one time some pieces of equipment came with heavier nuts these wrenches fit them look in old machinists handbook.

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msb

09-06-2005 07:57:52

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

Ford car rod nuts used to be 19/32".

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James2

09-06-2005 07:36:28

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

That 19/32 is almost a perfect match for 18 mm, which is commonly used on Ford vehicle crankcase oil plugs. I use it all the time.

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CNKS

09-06-2005 17:13:54

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Re: Odd Socket Sizes in reply to James2, 09-06-2005 07:36:28

19/32 = .59375 x 25.4 mm/in = 15.08 mm. 18 mm is about 23/32, thus is between 11/16 and 3/4---.

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Dannie

09-06-2005 02:29:04

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

Have sockets same size used on bicycle at one time,can not remember which size,like man said old Fords.One size have never used that I can remember and have worked on a lot of equipment.

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Slowpoke

09-06-2005 01:40:40

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

I always thought they were for "heavy duty nuts"
which are slightly wider across the flats & thickness. I think some socket and wrench sets still include the 19/32 size.

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george md

09-05-2005 21:42:22

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Re: Odd Socket Sizes in reply to Glenn FitzGerald, 09-05-2005 20:26:19

Glenn, Used mostly on old fords , but also on some other things. The first three were quite popular
the 31/32 not so much. I do have a wrench that
came with mack truck (stamped Mack ) and made by
williams tool co , that is 31/32 .

george

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Brian Shirley Goodfellow

09-06-2005 06:32:54

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Re: Odd Socket Sizes in reply to george md, 09-05-2005 21:42:22

Those "oddball" sizes come in handy for use on badly rusted or "rounded" nuts. I've used the 19/32 many times to remove 5/8 exhaust manifold nuts that are badly rusted. I find the metric sockets come in hand for this too; I just find one that can be "tapped onto" the rusted nut for a snug fit.

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