Wheel bolts

Z

zedonist

Guest
You see i would disagree on your China comments, its not "you get what you pay for", its actually "you get what you ask for", the chinese are very good at meeting customer requirements, and most buyers start by testing the water so just ask for a price using very limited information, they then get stars in their eyes at the cheap price that comes back and place an order, in europe and USA if i asked a european or USA supplier for a bolt without any specifics, he would assume what i wanted based on knowing me as a customer and my industry and apply the relevant specifics to the part and the quote, in China you get what you ask for literally, its a culture thing and why spend money making something you dont need, and on bolts that means bog standard commercial level manufactured to an AQL (Acceptable Quality Limit) which allows for defects to present and acceptable, when in fact in the automotive industry you want it manufactured to a zero defect plan, and be accompanied with a 32 page confirmation of quality document. there are some excellent bolt manufacturers in asia, i know because i have been there, assessed them and approved them for use on Ford, BMW, Jaguar, Land Rover plus others, so the articles are in your vehicles now and working.

Unfortunately the UK still does not fully embrace technical buying on fasteners, yes they focus on the expensive items like forgings, castings and machined items, but at the end of the day these are fastened to something using bolts, screws or nuts, so your big lump of metal is not the critical item. I don't know which turbines you reference Tony, but assuming it is wind turbines, the above is totally true, i looked at one at one of the big trade shows and counted 12 different head markings (suppliers) in just one application, i quizzed the guy on the stand and he did not understand the concept of batch control and grade segregation so it's no wonder that there a number of accidents with these turbines and bits falling off. It all comes down to technical knowledge, good engineering and buying smart not cheap, give China a break
 

t-tony

Zorg Expert (II)
Supporter
British Zeds
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E89 Z4 23i Auto
Apparently the main problem lies with Allen headed cheese head screws which won't even reach their torque figure before rounding out the hexagonal drive and when they do! In use with heat they stretch losing the tightness.This from a multi national company is very surprising.totally agree with your what you ask for comment too.
 
Z

zedonist

Guest
Sounds like they are not heat treated, which also goes to show you need to do the due diligence on the process and the part to ensure it is what it says on the tin, and why the approval process in automotive is do strict. Lessons to be learned I think, pass my details on happy to assist in improving there supply chain process.
 

Dino D

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British Zeds
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Kent
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2.8 Manual
Some interesting stuff but back to the wheel bolts.
The OEM ones I have somehow get over tight after time. The after market ones I had never did.
I tightened by hand using a cross brace like I have done for years and never before had this issue with the bolts becoming too tight over time.

Any ideas why this is happening with the OEM bolts (on OEM wheels too, not sure if happens on my Beyern wheels as they have not been back on that long).
 
Z

zedonist

Guest
If the bolts are old then the coating gets scrubbed off both the wheels and the bolts and then you get galvanic corrosion between the two parts and in essence they weld together.
 
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