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View Full Version : differential bolt size?



Bacondoggy
05-27-2009, 05:56 PM
:confused:what size/thread pitch are the bolts that bolt the back "cover" or "plate" onto the differential? I lost them, and don't want to take the ones out of the diff on the car! :eek:

Bacondoggy
05-27-2009, 11:33 PM
anyone have an idea?

Bacondoggy
05-29-2009, 10:16 PM
Oh I know someone here has to know the size of the bolts that hold the back on?? aren't they like 12 point bolta (about 10-12 I dont remember) I think they are metric size...? :confused:

Mike8675309
05-29-2009, 10:38 PM
Oh I know someone here has to know the size of the bolts that hold the back on?? aren't they like 12 point bolta (about 10-12 I dont remember) I think they are metric size...? :confused:

1/2" socket fit the best. I have a bolt in hand. I'll check at the hardware store tomorrow what size it is. I'm guessing standard us thread.

DLF
05-30-2009, 08:07 AM
5/16" x 18, 1.25" long. There are 10 bolts.

I use these: http://store.summitracing.com/partdetail.asp?autofilter=1&part=ARP-612-1250&N=700+&autoview=sku

Mike8675309
05-30-2009, 02:47 PM
5/16" x 18, 1.25" long. There are 10 bolts.

I use these: http://store.summitracing.com/partdetail.asp?autofilter=1&part=ARP-612-1250&N=700+&autoview=sku

Hmm, people following me.

That's what i found at the hardware store today. 5/16" x 18, 1-1/4 long. Flanged or use washers.

Bacondoggy
06-03-2009, 06:30 PM
thanks guys - a few questions - I guess it doesnt matter if you use 12 point bolts, as long as they are the correct size, right? Also - why are people using stainless steel as opposed to hardened steel? I thought the anodized (black) bolts are stronger?


http://reviews.ebay.com/Stainless-Bolts-Usually-very-weak_W0QQugidZ10000000001623345

http://www.nuttybolts.com/fastener-info/4materials.html

any info/opinions here on either question?

Mike8675309
06-03-2009, 10:35 PM
you don't anodize steel. The black bolts just have a black oxide coating. Zinc plated bolts are much more corrosion resistant. ARP stainless bolts often are not your Hardware Hank's stainless steel bolt. ARP's stainless is known as Stainless 300, and has a tensile strength of 170,000 psi. Grade 8 bolts have a tensile strength of 150,000 psi.