Thread size ?

[Stagdad]

After thinking about doing the mod to link the 2 heads at the back via the heater hose i got a second threaded hose connector the same as for the N/S head ,Just need to find out what thread it is and what size .presumably it isthe same as the temp sender thread.

Cheers Steve

[GDPR]

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It's big Steve....

Bob Heritage has already done his and maybe could advise..

Russ:dude:

[stustag]

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Hi Steve

It will most likely be BSP thread if you get thread guage and check the TPI it will indicate the size of tap you need. Example 28 TPI = G1/16 or 1/8x 28 BSP.

If you check the thread and tell me the diameter might have a tap for you to use?

Stuart

[stustag]

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Hi Steve

Here are some size to referance.

7.723 =G1/16, 9.728=G1/8, 13,157 =G1/4, 16.662=G3/8

Hope this helps:?

Stuart

[Stagdad]

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stustag wrote:

Hi Steve

Here are some size to referance.

7.723 =G1/16, 9.728=G1/8, 13,157 =G1/4, 16.662=G3/8

Hope this helps:?

Stuart

Thanks stu

O/D overall is 15.6mm

18G 5/16 seems to fit.

Can you translate that for me please

Cheers Steve

[Stagdad]

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kryten wrote:

It's big Steve....

Bob Heritage has already done his and maybe could advise..

Russ:dude:

I did get a 1/2"bsp tap set but it is much larger and although i'm sure it would work (there is a fair bit of metal around this area)it would have to be drilled out to 19mm to start with.I just wanted to keep it semi standard.

Cheers Steve

[stustag]

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Stagdad wrote:

stustag wrote:

Hi Steve

Here are some size to referance.

7.723 =G1/16, 9.728=G1/8, 13,157 =G1/4, 16.662=G3/8

Hope this helps:?

Stuart

Thanks stu

O/D overall is 15.6mm

18G 5/16 seems to fit.

Can you translate that for me please

Cheers Steve

Hi Steve

If it has 18 TPI then it is possibly NPSF but the size does not match however the closest tap is 3/8 x 18 NPSF whichis .6714" or 17.05mm Drill size 15m?

Are you sure it is 18 TPI how are you checking the thread?

Are you using one of these?

[stustag]

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Hi Steve

This may help as well?

http://www.plumbingsupply.com/pipethreadsizing.html

Stuart

[Stagdad]

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stustag wrote:

Stagdad wrote:

stustag wrote:

Hi Steve

Here are some size to referance.

7.723 =G1/16, 9.728=G1/8, 13,157 =G1/4, 16.662=G3/8

Hope this helps:?

Stuart

Thanks stu

O/D overall is 15.6mm

18G 5/16 seems to fit.

Can you translate that for me please

Cheers Steve

Hi Steve

If it has 18 TPI then it is possibly NPSF but the size does not match however the closest tap is 3/8 x 18 NPSF whichis .6714" or 17.05mm Drill size 15m?

Are you sure it is 18 TPI how are you checking the thread?

Are you using one of these?

Stu


sure as i can be that that is the one ,yes i'm using a thread gauge, and just checked the o/d again with vernier still 15.6mm:?

just checked an it fits well in temp sender thread as i suspected

Cheers Steve

[Bob Heritage]

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O.K.Steve, The Mk1 transfer housing has already got the thread in, closed of with a brass plug, where the Mk2 has a blank. I managed to get hold of a Mk1 and so did not have to tap it. What I used was a balafix valve so that if it did not work then I could close it off but as it was O.K. it is unnecessary to use the valve. What you need is a straight compression joint, bin the nut and olive off one end,use a Conex or similar but not a Prestex as the thread on those is much finer (these are brand names if anybody was wondering) The Mk1 and Conex thread is 1/2" BSP

Bob

[Stagdad]

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Bob Heritage wrote:

O.K.Steve, The Mk1 transfer housing has already got the thread in, closed of with a brass plug, where the Mk2 has a blank. I managed to get hold of a Mk1 and so did not have to tap it. What I used was a balafix valve so that if it did not work then I could close it off but as it was O.K. it is unnecessary to use the valve. What you need is a straight compression joint, bin the nut and olive off one end,use a Conex or similar but not a Prestex as the thread on those is much finer (these are brand names if anybody was wondering) The Mk1 and Conex thread is 1/2" BSP

Bob

Thanks Bob ,I've got 1/2 " BSP male to 15 compression fittings which i can fit but it just seems so big compaired with the other tapping on the n/s head which i now think is 3/8"bsp (Asked Peter Howells and he checked his temp sender and also thinks it is 3/8" bsp).Did they really tap out the MK 1's so much bigger?

If i go with the 1/2" bsp i'll have to get a 19mm drill bitand find an electric drill to fit it in unless i can get one with areduced shaft at one end.

Cheers Steve

[Bob Heritage]

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Only other alternative Steve is to try and get a fitting that is 3/8" BSP to 15mm copperor better still a transfer housing off an old Mk1 head.

[stag8manod]

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Hi Guys,

At the moment my transfer housings are off. One is tapped 1/2"BSP and the other 3/8 BSP. The hose ends on them are both the same. The 1/2" one my 1/2" BSP parallel tap screws into as it should . There is a BSP and a NP taper thread system of the same sizing andtheyare different. The 1/2" BSP and NP are both 14 tpi the difference being the thread angle. BSP 55dgr and NP 60 dgr though with thread tape or sealant it will work. The 3/8 BSP is 19 tpi and NP is 18 tpi as well as the thread angle difference but as long as all BSP is used it is not a problem.

Cheers Ian

[Stagdad]

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Thanks Ian ,

Steve