Front lower suspension arms - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 23-08-15 Thread Starter
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Front lower suspension arms

Anybody know where i can get the bolts that hold the bushes to the subframe .Mime are rusted and worn ,why o why dont these manufactures use stainless or at least zinc plated.

Theres 3 differnt sizes per side .I manage to pick up a pair of front lower arms for £25 delivered .The bolts alone are going to cost £20 .Ther must be a cheaper way to buy the bolts .You wouldnt mind but £20 is for the right amount of bolts and not bulk buying

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What size are the bolts?
(Post Link) post #3 of 5 Old 23-08-15 Thread Starter
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Originally Posted by Alfa git View Post
What size are the bolts?
they are 10mm thread 1.25 pitch

30mm long 2 per side

60mm long 1 per side

80mm long 1 per side
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Stainless bolts have a lower shear yield than Steel.

The minimum spec for a suspension bolt is 8.8 strength, an A4 stainless bolt isn't even close to that. Therefore stainless should only be used for non load bearing components such as trim, panels and expansion tanks etc.

Stainless bolts MUST be lubricated too as they are likely to sieze and if they dont then the steel component they screw into may corrode faster (galvanic corrosion) and cause the fixing to sieze solid.

The bolts do actually have a corrosion resistant coating, the problem is this is destroyed when they are removed. This is why you remove an untouched 10 year old bolt that looks new, then re-use it and 12 months down the line it looks badly rusted. It is also presumably why OEM's always recomend you use brand new bolts when replacing suspension components.

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As ransoman says there are problems with galling and corrosion and on the cars I only use stainless for non-load bearing fasteners, but it is possible to get stainless that meet the requirements, I have used them on the sub-frame of my BMW m/c for many years though you will need Property Class 80. See the attached reference.

Strength Specifications of Metric Threaded Fasteners
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