Need 11mm x 1.25 tap for Stripped spindle hole for caliper pin - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 12-30-2016, 05:48 PM Thread Starter
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Need 11mm x 1.25 tap for Stripped spindle hole for caliper pin

I had some seized brake caliper pins and could not get 1 out with a torch/hammer/rust penetrants/etc... I ended up cutting it off and drilling out the center of what was left of the pin. Stripped an "easy out" trying to get the remaining material out so I drilled it out completely.

Looking for a 11mm x 1.25 thread tap and so far I've had no luck at Home Depot, menards, ace hardware, autozone, pep boys, oreillys, advance auto........ I need the tap before Monday night or I'll be forced to weld the brand new pin to the spindle.

If there's any other pin with a different thread pitch, I'm open to suggestions. I have all taps for every size from 4-13mm except the one I need.
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post #2 of 11 (permalink) Old 12-30-2016, 06:10 PM
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11x1.25 tap

Check one of the OReilly store in you area. I just looked and they might have it. I saw there are a bunch of stores up that way.

Mark: Snowman-33

Whoops. I just saw you had checked them. I was trying to help. Hey, what about Sears?

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post #3 of 11 (permalink) Old 12-30-2016, 06:26 PM
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I just had another thought. What about Snap-on, Mac or Matco? Any in your area that you could contact?

Mark: Snowman-33

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post #4 of 11 (permalink) Old 12-31-2016, 07:06 AM
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Starting out @ $11.99 + Shipping on a buy now, USA only listing.

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post #5 of 11 (permalink) Old 12-31-2016, 07:55 PM Thread Starter
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Yeah, oreillys lists them but its special order and they called the next day to day they're unavailable from the manufacturer (CDT which is century drill & tool). I seen eBay but with the holiday and needing by Monday it doesn't help.

Last edited by cashmoneyspeed; 12-31-2016 at 07:59 PM.
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post #6 of 11 (permalink) Old 01-01-2017, 04:42 PM
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Caliper bolt

Are we talking about the bolts that hold the brake caliper to the front spindle on a B body? If so those are a 7/16 x 20 UNF thread not metric. My B body parts catalog calls out the thread on these bolts.
Ken Hennessy
Edit or try a Dorman 13891 caliper bolt which has an oversize thread for repair of stripped threads, parts stores may have these in stock.

Last edited by Ken Hennessy; 01-01-2017 at 06:51 PM. Reason: Added info
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post #7 of 11 (permalink) Old 01-18-2017, 12:13 AM Thread Starter
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No, not the caliper bracket bolts. It was the caliper mounting pins that take a hex key and hold the caliper to the bracket. I ended up getting the 11mm x 1.25 tap from CDT on Amazon for $7. Worked like a charm thanks to drilling the hole out perfectly and 90% of the original threads were still intact. I bought new caliper pins from advance auto for $5 (autozone had em for $20).
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post #8 of 11 (permalink) Old 01-18-2017, 09:59 AM
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Are we talking about the bolts that hold the brake caliper to the front spindle on a B body???? What car are you working on? Who said that is a metric thread?
The caliper pins are 7/16 x 20 thread and use a 3/8 hex bit. An 11mm x 1.25 thread is dimensionally very similar but it is not the correct thread.
7/16 is 0.4375 inches
11mm is 0.433 inches
20 threads per inch is 0.050 threads per inch
1.25 thread pitch is 0.049 threads per inch

Ken Hennessy
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post #9 of 11 (permalink) Old 01-18-2017, 09:47 PM Thread Starter
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Yes, the brake caliper pin/bolts that install with a 3/8" hex bit. '94 Caprice, stock spindles. The 11mm x 1.25" fit perfectly and matched the 1 good old and new caliper pins exact. Hand threaded it through the spindle hole that the original pin had come out as well. Checked with thread pitch gauge before I ordered as well as online.
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post #10 of 11 (permalink) Old 01-18-2017, 10:44 PM
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Have you considered replacing the knuckle/spindle?

Bill Harper
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