any one a wizard at bolts ?

simonfraser said:
one of these
https://www.ebay.co.uk/itm/131899935900?ul_noapp=true
its the holes in the back that take the braket to fix it to the wall for which i need the bolts
have asked the suplier, no use
Click to expand...

Confusing, coming from America and it looks very similar to a Mercruiser I once had, it could be an American thread.
But Volvo from Sweden it could be a metric thread.
What you would need to do is measure the ID and thread pitch.
Take it to a specialist machine fixings supplier. They could probably measure it and sell you the bolts
 
Norman_E said:
That sounds like a standard 10mm thread, with a 1.5mm pitch. Overall diameters of metric bolt threads are always slightly under the nominal size due to crest rounding. It would help to know where the equipment was made as that will allow a better guess as to whether the threads are metric or imperial. Metric threads have standard pitches for each diameter, but non standard finer pitches are also available, so if its metric 10mm x 1.25mm pitch or even 1mm pitch are also possibilities
Click to expand...

I would also try a fine M10 ... 1.25 pitch is commonly used for hydraulics and pneumatics
 
coopec said:
Information on Screw Threads
Historical Background
It is considered by some that the screw thread was invented in about 400BC by Archytas of Tarentum (428 BC - 350 BC). Archytas is sometimes called the founder of mechanics and was a contemporary of Plato. One of the first applications of the screw principle was in presses for the extraction of oils from olives and juice from grapes. The oil presses in Pomeii were worked by the screw principle.

http://www.boltscience.com/pages/screw2.htm
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I thought screw threads were invented by Zeus, Greek god of the sky and thunder
.

At least i have one of his little books with tables of screw threads.
 
VicS said:
I thought screw threads were invented by Zeus, Greek god of the sky and thunder
.

At least i have one of his little books with tables of screw threads.
Click to expand...

I also have his book copyright 64 Unified edition.

On the back it says used by BOAC, BEA AVRO and lots of others who are not around now.

Also has log tables. Any one still use log tables or trig tables now.
 
simonfraser said:
one of these
https://www.ebay.co.uk/itm/131899935900?ul_noapp=true
its the holes in the back that take the braket to fix it to the wall for which i need the bolts
have asked the suplier, no use
Click to expand...

If its a VP part then very very likely to be a metric thread. If its not the common M10 x 1.5 then most probably M10 x 1.25

Your VP dealer should be able to identify them if all else fails ......... VP part number 971017 ??????

#11 in this diagram

18185.jpg
 
Last edited:
Rogershaw said:
I also have his book copyright 64 Unified edition.

On the back it says used by BOAC, BEA AVRO and lots of others who are not around now.

Also has log tables. Any one still use log tables or trig tables now.
Click to expand...

Mines 1 year younger ... really ought to have splashed out on a more recent metric edition!
 
RIBW said:
I am often confused by the wide variety of mechanical dimensions, so I've tried to combat such situations with a spreadsheet of all possibilities to,hopefully, find the nearest options. In your case this would give me these possibilities - the desig is followed by ‘threads per inch – tpi’ and (for most, distance between threads):-

3/8 desigs;
BSW: 16 (1.59mm)
BSF: 20 (1.27mm)
BSPT: 28tpi
UNC: 16 (1.59mm)
UNF: 24tpi
UNEF: 32 (0.8mm)
BSB: 26 (0.98mm)

3/16 JIC: 24tpi

1/8 BSP: 28tpi

M10: 17 (1.5mm)

If M10 is the “better fit” to date the closest of the above options would be BSW or UNC

Cheers
Bob
PS Corrections to the above gratefully received!
Click to expand...

I'd appreciate a copy of that there spreadsheet!
 
VicS said:
If its a VP part then very very likely to be a metric thread. If its not the common M10 x 1.5 then most probably M10 x 1.25

Your VP dealer should be able to identify them if all else fails ......... VP part number 971017 ??????

#11 in this diagram

18185.jpg
Click to expand...

tnx Vic, as far as i know no VP pumps are made for this any more
so have fitted a generic pump, the VP bolts did not fit the new generic pump
 
VicS said:
You might add Metric- fine threads.
Click to expand...

Vic, Thanks for the suggestion. I spent some of yesterday's 'winter' day adding a separate tab for Metric Fine . Will try to integrate the data when I have digested and understood having up to three TPIs on some of the bolt sizes.
Cheers
Bob
 
simonfraser said:
Hm, ordered M10 fine pitch and UF 3/8 neither of those fit, tnx for the suggestions........
Click to expand...

Apologies if I missed something but I suggested in #11, 3/8 BSW or UNC to get near to your 'better fit'. Both have 16 tpi as opposed to your original M10's 17tpi.

3/8 UF (UNF?) has 24tpi.
Cheers
Bob
 
VicS said:
I thought screw threads were invented by Zeus, Greek god of the sky and thunder
.

At least i have one of his little books with tables of screw threads.
Click to expand...

Ooh! Mine was left in Angola, along with the thread guages when we were evacuated!
 
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