Hi there,

I would like to know the size of the front upper control arm bolt for a 1987 GT.

I'm trying to collect suspension parts before I get down to business and don't want to get stuck needing a bolt if I need to saw something apart. Since the Fiero Store doesn't list the grade/class of bolts, I'll go to a bolt dealer to get replacements.

In case anyone references the thread for the lower control arm bolts, the answer has been given before:

quote Originally posted by Bloozberry: According to the P Book, they are exactly the same: M12 X 1.75 X 90 (10.9), that is: M12 = 12mm bolt diameter 1.75 = thread pitch 90 = length in mm 10.9 = grade

Thanks for your time,

-Snacktime

quote Originally posted by Snacktime: Hi there, I would like to know the size of the front upper control arm bolt for a 1987 GT. I'm trying to collect suspension parts before I get down to business and don't want to get stuck needing a bolt if I need to saw something apart. Since the Fiero Store doesn't list the grade/class of bolts, I'll go to a bolt dealer to get replacements. In case anyone references the thread for the lower control arm bolts, the answer has been given before: Thanks for your time, -Snacktime

As you know, the Fiero Store has them.

For what it's worth, they have the EXACT same markings on the bolts from the Fiero Store, as the ones I took off. I'm in the middle of doing it now. The Fiero store also comes with the appropriately sized washers for if you decide to change the caster. It comes with 6 washers, instead of two. But three of them equal the same spacing as one of the two.


EDIT: They are also stainless steel. So when I installed the bolts, I did it slowly so as not to gaul it. But they should look good almost indefinately...

------------------
Todd,
2008 Jeep Patriot Limited 4x2
2002 Ford Explorer Sport 2dr 4x2
2002 Ford Crown Victoria LX
1987 Pontiac Fiero SE / V6
1973 Volkswagen Type-2 Transporter

[This message has been edited by 82-T/A [At Work] (edited 10-11-2010).]

quote Originally posted by 82-T/A [At Work]: They are also stainless steel. So when I installed the bolts, I did it slowly so as not to gaul it. But they should look good almost indefinately...

I sincerely hope you are talking about the washers being stainless not the bolts. Stainless bolts, even if you werer to use the stronger corrosion resistant A4-80's, have only 77% of the tensile strength of the stock 10.9 grade carbon steel bolts, and only 64% of their yield strength. Here are the specs fot the two most common alloys of stainless steel fasteners:

10.9 Carbon Steel tensile strength: 151,000 psi / yield strength: 136,000 psi
A2-70 (stainless 306) tensile strength: 102,000 psi / yield strength: 65,000 psi
A4-80 (stainless 316) tensile strength: 116,000 psi / yield strength: 87,000 psi

As for the size of the upper control arm pivot bolt for the '84 - '87's, here you go:

M12 X 1.75 X 250 (10.9)

If you have trouble finding some, I bought a box of 12 two years ago and only used two. They are allen-key pan heads and are grade 12.9. PM me if you are interested in a pair.