stainless screw on clutch cover ok?

[molten]

Another dim question:

I got some stainless a2 socket cap screws for clutch cover plate to flywheel.
Do you think they will be ok?

Thanks
Scott

[nang]

I'd prefer high tensile bolts personally.
Tony.

[molten]

Also...
The original clutch driven plate seems to have a flat boss (to flywheel) side wheras the new onehas a raised boss. See pic. Will this be a problem?

Cheers

[Velocita Rosso]

Do not use stainless
HT bolts should be used
The friction plate on the right looks quite correct

[nicmk1est]

same here high tensile,much much stronger

[stevegt6]

It would be a waste of ST-ST bolts imo - they are not on show and not subject to rain/salt etc...

FYI:

Strength Specifications of Metric Threaded Fasteners

The following table describes the strength specifications for the different property classes of metric steel bolts, screws and studs:
Property Class     Nominal Size Range (mm)     Proof Strength (MPa)     Yield Strength, min(MPa)     Tensile Strength, min(MPa)     Material
4.6     5-100     225     240     400     Low or medium carbon steel
4.8     1.6-16     310     340     420     Low or medium carbon steel; fully or partially annealed
5.8     5-24     380     420     520     Low or medium carbon steel; cold worked
8.8     Under 16 (incl.)     660     640     800     Medium carbon steel; quenched and tempered
8.8     17-72     580     660     830     Medium carbon steel; quenched and tempered
9.8     1.6-16     650     720     900     Medium carbon steel; quenched and tempered
10.9     5-100     830     940     1040     Alloy steel; quenched and tempered
12.9     1.6-100     970     1100     1220     Alloy steel; quenched and tempered

The tensile strength or ultimate tensile strength can be defined as the maximum amount of tensile stress that a component can withstand before it fractures.

The proof strength can be defined as the maximum amount of tensile stress that a component can withstand before it begins to exhibit plastic or permanent deformation on release of the stress applied.

The yield strength can be defined as the amount of tensile stress that a component can withstand when it exhibits 0.2% plastic or permanent deformation.

The property class is normally stamped on the head of the bolt. The two figures indicate the tensile and yield strengths of the bolt or screw.

In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.

Strength Specifications of Stainless Steel Threaded Fasteners

The following table, taken from BS EN ISO 3506, describes the strength characteristics of different grades of austenitic stainless steel bolts, screws and studs:
Steel Grade     Property Class     Nominal Size Range (mm)     Tensile Strength, min(MPa)     0.2% Proof Stress (MPa)
A1,A2,A3,A4,A5     50     Under 39 (incl.)     500     210
70     Under 24 (incl.)     700     450
80     Under 24 (incl.)     800     600

Stainless steel fasteners do not exhibit a yield stress. In this case 0.2% proof stress is used instead, and can be defined as the tensile stress required for the component to exhibit elongation of 0.2%.

[esxefi]

I used 12.9 allen bolts for the clutch and the flywheel.the last thing you want is any bolts failing in that area. :o

[nicmk1est]

YEAH but stainless steel looks good and adds to value of under-valued cars  :X   theres a can of worms ;D