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| Dampfzauberer |
Help finding the right screwI have this screw here from my stuart.I'm sorry i always ask here for help, but stuart is completely new to me, also i don't have a clue about those UK screws 
This is one of those who hold the cylinder plates. I need to have 3 more of them. Can anybody tell me which one i need? Or does anybody have some in spare? (will pay for them of course!) The measures are... Lenght of the threaded part: 7mm Diameter: 2,45 or 2,5mm 
The hex head is 4,6mm |
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| Roly Williams |
What's the thread pitch? | ||||
| Dampfzauberer |
Sorry it's so small, i can't measure that...
Or is there a kind of trick to find it out??? |
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| Roly Williams |
The simplest way is to measure the length of the threaded portion (you've already done that) and then count the threads by running a fingernail down it. Going by the diameter alone (assuming it's not a metric thread) it could be 7BA, which would be 2.5mm diameter and 0.48mm pitch. |
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| Dampfzauberer |
You could be right!
There are 12 threads i counted... |
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| Roly Williams |
M2.5 is 0.45mm pitch, which is also close, but 7BA is more likely for a Stuart. | ||||
| Dampfzauberer |
So it is a TBA screw i need. All other screws are also not metric as none of my spanners will fit 
So i guess this one is also not metric. Anybody got 3 screws for me??
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| Roly Williams |
The only 7BA screws I have are 5mm long. Would those be long enough? They are slotted cheese head not hexagonal. |
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| tmuir |
Sorry but only way I know for sure is to measure the diameter preferably with a micrometer but a vernier will do and go to a good hardware store and buy a thread pitch gauge and measure it.
If it is BA it will fall between sizes but that will be good enough to know for sure. This is a thread pitch gauge, they are not expensive and very useful for working out thread sizes on missing parts of engines. http://cgi.ebay.co.uk/ws/eBayISAP...60352112084%26_fvi%3D1&_rdc=1 |
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| steamcollector |
Dampfzauberer
I have just checked my own Stuart 10V and the cylinder head studs are 7ba. These are quite widely available, I quite often use Macc Models although his delivery costs seem to have increased recently, but there are other companies. Just buy over-length and cut to the size you want. Here's a link if you would like to try them http://www.maccmodels.co.uk/index.php?cPath=255_21_142_148 You may be able to find a company closer to you. Just found this as well on ebay, same company but cheaper shipping, and world wide click here Hope it helps Will |
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| Graham-Jilly |
I have bought a few items from macmodels and find them quite reasonable as its cheaper for me to buy from them and have them shiped here than buying them here in Aus 
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