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Ted's daft question of the week ?
fogrider:
As well as the advice to use copper grease on SS bolts, I was told decades ago to not put stainless steel nuts on SS bolts. Have one or the other in mild steel ( ZP no problem ). A vehicle restorer, he told me SS has a grain, SS on SS 'rags' when you try to undo them. It's true, I found out by experience, having forgotten his advice. The SS nuts with SS bolts on my old lorry mudguard brackets would NOT come off, they ragged up and I had to cut them all off, some expensive bolts too !
Some copper grease these days is rubbish too, I've taken to using silicone grease which is not too expensive from plumbers merchants. Invisible too....
McCabe-Thiele (Ted):
--- Quote from: Spitfire on July 01, 2021, 10:32:16 AM ---Don't know if this will help but I found it when I renewed a lot of bolts on my 750F1, it was from the Custom Fasteners website.
IMPORTANT - PLEASE READ BEFORE ORDERING METRIC BOLTS.
Metric bolts in M4, M5, M6, M7 and M8 diameters are suitable for both European and Japanese motorcycles and cars.
However, M10 in the standard 1.50 pitch are only suitable as replacements on European machines. They will not fit Japanese vehicles which use their own specialised fine thread. Please see the next section in the catalogue for our specially produced range of M10 and M12 fine thread bolts for Japanese vehicles.
M10(1.25 pitch) and M12(1.25 pitch) FINE THREAD METRIC BOLTS
For use on Japanese motorcycles and cars. M10(1.25) bolts have a 17mm spanner size, M12(1.25) bolts have a l9mm spanner size. The Japanese often
use a smaller size head on their bolts, so please check there is sufficient clearance for the standard size head we supply, before ordering.
NOTES ON METRIC BOLTS
M4 fits spanner size 7mm. M4 thread pitch is 0.70mm.
M5 fits spanner size 8mm. M5 thread pitch is 0.80mm.
M6 fits spanner size 10mm. M6 thread pitch is 1.00mm.
M7 fits spanner size 11mm. M7 thread pitch is 1.00mm.
M8 fits spanner size 13mm. (Japanese M8 bolts use 12mm spanner size). M8 thread pitch is 1.25mm.
M10 fits spanner size 17mm. M10 thread pitch is 1.50mm.
Cheers
Dennis
--- End quote ---
Thanks Denis that is very useful I've saved the info on a Word document for future reference.
McCabe-Thiele (Ted):
--- Quote from: fogrider on July 01, 2021, 05:17:50 PM ---As well as the advice to use copper grease on SS bolts, I was told decades ago to not put stainless steel nuts on SS bolts. Have one or the other in mild steel ( ZP no problem ). A vehicle restorer, he told me SS has a grain, SS on SS 'rags' when you try to undo them. It's true, I found out by experience, having forgotten his advice. The SS nuts with SS bolts on my old lorry mudguard brackets would NOT come off, they ragged up and I had to cut them all off, some expensive bolts too !
Some copper grease these days is rubbish too, I've taken to using silicone grease which is not too expensive from plumbers merchants. Invisible too....
--- End quote ---
Here it's termed differetly but same issue!
https://www.essentracomponents.com/en-gb/news/product-resources/how-to-prevent-galling-on-stainless-steel-bolts
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