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Author Topic: Any Dixon Bate specialists here.  (Read 570 times)

Ed Straker

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Any Dixon Bate specialists here.
« on: May 30, 2021, 03:42:01 PM »


I have picked up a later type NATO pintle hook today.

It is missing the four screws that hold the hook retaining plates on.

The holes for the screws are smaller than my much earlier FV Dixon Bate Manchester branded one and they are also not countersunk.

Would anyone know what thread these might be?

Cheers

Jamie
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Davidss

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Re: Any Dixon Bate specialists here.
« Reply #1 on: May 30, 2021, 04:06:42 PM »

The drawing I have for that style of hitch does say the screws are countersunk, but also says the threads are 1/4 x 28 UNF.
Looking at your photos the hole diameter looks to be about 1/4", have you actually tried a 1/4 UNF bolt in there? Unless someone else comes along with experience of the non-countersunk fixings, that's what I would try.

I don't know about the 'later style' comment; I can see you have the stand-off mounting there, 551884.

Regards.
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Norm

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Re: Any Dixon Bate specialists here.
« Reply #2 on: May 31, 2021, 08:49:20 AM »

Just to confirm Davidss info it is a 1/4 UNF countersunk screw.

Dave

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Ed Straker

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Re: Any Dixon Bate specialists here.
« Reply #3 on: June 01, 2021, 12:01:45 PM »

Thanks heaps,

Yes my old DB NATO Hook also has the 1/4 inch unf counter sunk screws which are too big for this one.

I will take it down to a bolt place on my next day off.

Thanks David I did not realise the stand off had its own part number.

cheers

Jamie
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w3526602

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Re: Any Dixon Bate specialists here.
« Reply #4 on: June 03, 2021, 07:16:34 AM »

Hi,

A little learning, etc plus failing memory ...

... something about micrometres using a 1/4"BSF thread with 40TPI, so one complete revolution of the knob alters the gap by 25 thou.

I think my understanding of the theory is correct ... not sure about the details.

1/4" is 6.35mm, so 6M bolt is slightly smaller than 1/4"BSF.

Does the INDESPENSION catalogue list spares for these hooks?

602
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Ed Straker

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Re: Any Dixon Bate specialists here.
« Reply #5 on: June 14, 2021, 10:16:09 AM »

Bolt man said 10/32.

And gave me 4 with flat heads to sort me out.

Cheers

Jamie

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Davidss

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Re: Any Dixon Bate specialists here.
« Reply #6 on: June 14, 2021, 11:44:33 AM »

Thank you for giving us the answer.
I'm going to guess that '10' is an American / Australian screw gauge, while '32' is pitch, in (Imperial) TPI.

Nothing like a mix and match :-)

Regards.
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Sunny Jim

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Re: Any Dixon Bate specialists here.
« Reply #7 on: June 14, 2021, 12:31:15 PM »

10 is the screw gauge and 32 the thread pitch. This seems to be quite common for smaller screws and bolts but finding the actual nominal size online seems difficult, to try and identify what you have, or what you need! Once you know the size, getting them isn't a problem. The Americans used, and still use, small Whitworth threads, getting these was a problem for the GE mobile x-ray sets we had at work!

¼" BSF is 26tpi. 40tpi is used on things like model engineers threads (seem to be 32 or 40 tpi). The weirdest thread I have had recently was ¼" x 36 tpi that was on the little drain pipes that go in the window rails of old railway carriages - they are like a piece of brake pipe with a flare at the top, and a thread at the bottom. I managed to get a tap and die from Tracy Tools and it turns out to be 'UNS' (Unified National Special), although it is unlikely the originals were a unified thread profile.

Sunny Jim

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gvo416j R.I.P.

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Re: Any Dixon Bate specialists here.
« Reply #8 on: June 14, 2021, 05:52:26 PM »

10-32 is a UNF screw gauge. 10 is the gauge which equates to 11/32" major diameter [across the tips of the thread] and 32 threads per inch [tpi]

I cannot remember how many, but there are 4 to 6 sizes below the 3/16" UNF bolt designation which have the standard UN thread form and varying tpi.

Once you move away from the standard threads it is an absolute minefield and there are a miriad of  different variants. Some of them are included in the most common basic UNS series of threads but not all are.

UN = denotes the basic thread form
UNC = standard coarse thread range
UNF = standard fine thread range
UNEF = standard extra fine thread range [ there are a few larger diameters  of bolt which have 2 differing tpi from the standard UNF, yet both are designated UNEF]
UNS = a basic range of more common special threads, but it actually covers anything which has the basic UN thread. These have standard UN thread form but many variations of weird tpi numbers.

There are also J and R designations where the letter appears between the UN and the range identifier. These have a modified UN thread with different root and tip dimensions.
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w3526602

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Re: Any Dixon Bate specialists here.
« Reply #9 on: June 14, 2021, 08:07:41 PM »

¼" BSF is 26tpi.

Hi Sunny Jim,

OK ... so I'm wrong ... but I always understood that micrometers use
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