 M7 Bolt Source?, For Brake Caliper Halves |
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| aggiezig |
 Feb 6 2019, 02:15 AM
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#1
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Porsche Wannabe  Group: Members Posts: 319 Joined: 13-January 16 From: Los Angeles, CA Member No.: 19,557 Region Association: Southern California 
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Anyone know of a good source to buy class 12.9 M7 hex bolts? I'm looking to replace the bolts that hold the caliper halves together, if possible.
I had my bolts re-plated in zinc not realizing they were 12.9 grade bolts. Apparently, this is a no-no as harder bolts are more susceptible to hydrogen embrittlement during the plating process. Any tips appreciated. I've done a lot of online searching but this is just a really odd sized bolt and hard to find, especially in 12.9. |
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Replies(1 - 5)
| ConeDodger |
Feb 6 2019, 02:42 AM
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#2
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Apex killer! Group: Members Posts: 23,611 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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Call PMB and buy from them.
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| Mark Henry |
Feb 6 2019, 06:33 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
New? good luck.
Off of a core or PMB |
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| mepstein |
Feb 6 2019, 06:53 AM
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#4
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914-6 GT in waiting Group: Members Posts: 19,313 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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I'm pretty sure PMB replates their bolts. New ones are NLA. I think they need to be baked during the plating process.
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| bbrock |
Feb 6 2019, 09:23 AM
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#5
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(mepstein @ Feb 6 2019, 05:53 AM)  I'm pretty sure PMB replates their bolts. New ones are NLA. I think they need to be baked during the plating (IMG:style_emoticons/default/agree.gif) I've read and watched the PMB brake rebuilt How-to and video many times as I'm doing it myself. He clearly states the fasteners are replated in black zinc. Everything I've read about hydrogen embrittlement says the parts need to be baked at 375F-400F for 4 hours within 4 hours of plating to drive the hydrogen out. Maybe ask the plater if they baked them? |
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| aggiezig |
Feb 6 2019, 08:19 PM
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#6
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Porsche Wannabe Group: Members Posts: 319 Joined: 13-January 16 From: Los Angeles, CA Member No.: 19,557 Region Association: Southern California
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Great tips everyone, thanks. I believe the plater baked everything but not 100% certain.
I have a couple of cores laying around so may try to salvage those bolts, if not PMB is a good option, too. |
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