So I'm working on a brake swap and need info on the caliper slider bolts thread pitch. I tried matching it up to the thread wall at the local lowes and come to the conclusion it is a 7/16 bolt but the thread pitch is what is stumping me. The wall had a 14 tpi and a 20 tpi. I used a thread per inch gauge and found it to not match 20, 18, 16, or 14 threads per inch. none of the taps that are available from grainger suggest that 18, 16 tpi's are even available. So did GM use some sort of magical mystery tap thats proprietary to them? Is my bolt stretched? Thanks for the help.

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK
12.3 is faster than a 13.2

It's metric. I think it's M11 x 1.5. It should be 10.8 hardness, but good luck with that. There are many sources for these, but they're all going to be 8.8 with hex socket heads. Best to use the ones you have.

I was thinking it might be metric as well but i've never seen a M11 bolt. I will reuse my slider bolts but i need to tap my my bracket. Thanks!

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK
12.3 is faster than a 13.2

You don't buy a regular hardware store bolt for brake calipers.
Any Auto Parts store should be able to get you proper replacements.
Part numbers: http://www.rockauto.com/cat...49107,parttype,10281

What brake swap?

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Calgary time/temp

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[This message has been edited by fierosound (edited 01-15-2015).]

quote Originally posted by fierosound: You don't buy a regular hardware store bolt for brake calipers. Any Auto Parts store should be able to get you proper replacements. Part numbers: http://www.rockauto.com/cat...49107,parttype,10281

I don't need the bolt, I need the thread size for the slider bolt so that I can tap my bracket for my brake mod.

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK
12.3 is faster than a 13.2

Went to the local mom and pop hardware store and found a m11x1.5 tap in about 30 seconds! Love those mom and pop stores!

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK
12.3 is faster than a 13.2