Alez
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| posted on 11/7/07 at 08:39 AM |
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Witworth bolt?
Hi guys,
I need to buy a couple of 5/16 bolts. These are very unusual in Spain as here we use metric everywhere. I need to travel to the UK soon (Glasgow, for
business) and I was hoping to get them there. I would like to have your advice on how common these are and where to get them.. Should I expect to find
these in a place like say Halfords or do I need a more specific store?
Cheers,
Alex
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Alez
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| posted on 11/7/07 at 08:39 AM |
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The bolts in the pics are the original ones, thread is about 18mm long, I'm looking to replace them by longer ones, about 18-19mm long thread.
The head is also "american" (do you call that "american" just like we do here or do you use a different name for that?) but any
head would do, in fact an "european" one would allow me to use a normal spanner instead of an adjustable one which is nice, but I don't
care much.
 
Motor with gear
These bolts fasten the thermostat housing to the engine on a Rover V8 engine with Edelbrock dress kit. Too short bolts have damaged the inner thread
(aluminium) but there's plenty more thread further inside..
BTW, may be the case that the original Rover V8 engine uses the same arrangement for these than the Edelbrock one? In other words, maybe I can just
order a couple original bolts from Range Rover?
Cheers,
Alex
[Edited on 11/7/07 by Alez]
[Edited on 11/7/07 by Alez]
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ned
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| posted on 11/7/07 at 09:01 AM |
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Alex,
You won't be able to get that size off the shelf in somewhere like halfords or b&q, you'd need a specialist bolt stockist/shop. Your
best bet is probably to source one through a land rover supplier if possible such as rimmer bros etc etc etc
Otherwise I have used namrick (www.namrick.co.uk) who can normally supply most things bolts related and do mail order.
all imho..
Ned.
ps just to be pedantic I think it's spelt whitworth and also known as BSW (British Standard Whitworth)
[Edited on 11/7/07 by ned]
beware, I've got yellow skin
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David Jenkins
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| posted on 11/7/07 at 09:15 AM |
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I'd be surprised if it was Whitworth - surely it's a Unified thread, UNC or UNF. Looking at the picture, I would suggest UNC.
As the engine was originally designed in the US, you're talking about Edelbrock bits, and BSW hasn't been used since the 50's...
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muzchap
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| posted on 11/7/07 at 09:18 AM |
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Hi mate,
there's loads on EBAY 
CLICK ME FOR LOTS OF BOLTS
Good luck.
Whitworth and UNC are pretty similar its just the angle of the thread thats different - I was told. And they will fit 
I had to use Whitworth on my old skool RS2000 alloy bellhousing as couldn't get any unf's or summit!
------------------------------------
If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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britishtrident
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| posted on 11/7/07 at 09:25 AM |
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ISTR 5/16" is the only where UNC can't substuitute Withworth -- different tpi.
Looking at your engine I strongly suspect it is really 5/16" UNC you require.
Whitworth went out of automotive use in the UK before 1960
This URL will be able help by mailorder http://www.namrick.co.uk/browse.asp?PCID=6
[Edited on 11/7/07 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 11/7/07 at 09:43 AM |
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To correct myself on this
1/2" not 5/16" is only size the TPi of Whitworth and UNC differ
From http://www.moreg.org.au/whitworth.htm
British Standard Whitworth (BSW)
These are the original, 19th Century, coarse-threaded industrial bolts designed to hold locomotives together. Because of their coarse pitch, they are
more prone to vibrating loose, so are little used on motorcars. Except for threading into aluminum (e.g. crankcase studs), where a coarse thread is
less prone to stripping than a fine one. It turns out that, except for 1/2" (where the British use 12 threads per inch (tpi) and Americans use
13 tpi) the thread pitches for the rest are the same as for American Unified Coarse (UNC). However, the thread form is different; Whitworth = 55
degrees; UNC = 60 degrees. In spite of this, mismatched nuts and bolts mate nicely, so you're likely to find UNC bolts or studs where BSW should
have been.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Alez
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 posted on 11/7/07 at 12:06 PM |
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Chaps, looking at the times for your posts I can't believe how quick you came with such useful posts. Very, very useful, thanks.
Btw, the helicoil option should be avoided if possible due to the position of the hole, I'm not sure it's possible at all to work that in
at all, very tricky if at all possible (even with the distributor out of course, that was the case yesterday when I was looking at it).
Thanks everyone, I've learnt quite a lot today.. again!
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ned
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| posted on 11/7/07 at 01:15 PM |
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Calvinx,
I'm only 2nd guessing, but when Alex says position of the hole maybe he means it's vicinity of the scuttle or other parts of the car
it's fitted in (a fury iirc). Access with the tools without removing the engine might be an issue in a tight engine bay?
I do agree that helicoil would be another good option though.
cheers,
Ned.
beware, I've got yellow skin
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rusty nuts
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| posted on 11/7/07 at 05:04 PM |
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Do you have any local breakers in your area that have an old type Mini in stock? If so the clutch housing bolts are 5/16UNC . IIRC , they are also a
little longer than you need and could be cut to size
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gazza285
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| posted on 11/7/07 at 06:24 PM |
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You could always buy two unc/unf manifold studs and locktite them in, the studs are cheap enough and I've more 5/16UNF nylocks than I know what
to do with. If I can find some I might have some spare studs as well that you can have, let me have a poke around in the shed.........
DO NOT PUT ON KNOB OR BOLLOCKS!
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gazza285
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| posted on 11/7/07 at 06:49 PM |
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How about these,
Let me know where to send them, no charge if you want them.
DO NOT PUT ON KNOB OR BOLLOCKS!
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gazza285
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| posted on 11/7/07 at 06:54 PM |
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quote:
Originally posted by muzchap
I had to use Whitworth on my old skool RS2000 alloy bellhousing as couldn't get any unf's or summit!
The threaded holes in an RS2000 bellhousing are 10mm.
DO NOT PUT ON KNOB OR BOLLOCKS!
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Alez
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| posted on 12/7/07 at 04:44 PM |
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Thank you all very much.
Yes, as Ned says I meant difficult to rework with the engine in place..
I finally have been able to get these bolts from a specialist, apparently it was my only bet in Madrid! The ones they have provided were long, so a
friend had to cut them to length.. and that's how I now have a very nice set of custom bolts  Oh, and the good thing as well is they have
european hex head, so normal spanner!
Thanks everyone for the lesson
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