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#1
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Screws for disc brake caliper mounting?
Missing a couple of screws for mounting adapters and calipers. The frame
of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. -- Regards, Joerg http://www.analogconsultants.com/ |
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#2
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Screws for disc brake caliper mounting?
On Thu, 09 Nov 2017 15:19:50 -0800, Joerg
wrote: Missing a couple of screws for mounting adapters and calipers. The frame of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. Sure, I use stainless screws on my bikes. Mostly because there is a shop nearby that stocks both metric and imperial sizes from ~1mm up to about 1/2" in various lengths. Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). -- Cheers, John B. |
#3
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Screws for disc brake caliper mounting?
On Thursday, November 9, 2017 at 3:19:46 PM UTC-8, Joerg wrote:
Missing a couple of screws for mounting adapters and calipers. The frame of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. For my flat mount brackets, I used standard SS cap screws purchased at the local hardware store. Those happen to be 5M, IIRC. The 6M caliper mounting hardware came with the brakes, and it looks like plated steel. No special alloys required. I don't think galvanic corrosion is a big deal with brake mounting hardware unless your roads are salted and you ride in snow. -- Jay Beattie. |
#4
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Screws for disc brake caliper mounting?
On 2017-11-09 17:33, John B. wrote:
On Thu, 09 Nov 2017 15:19:50 -0800, Joerg wrote: Missing a couple of screws for mounting adapters and calipers. The frame of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. Sure, I use stainless screws on my bikes. Mostly because there is a shop nearby that stocks both metric and imperial sizes from ~1mm up to about 1/2" in various lengths. Out here in the boonies the hardware store does not carry metric in stainless, only non-metric. Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). I use LiquiMoly mounting paste. It doesn't help locking but prevents seizing and allows quick adjustments or, as has happened, disconnecting them after a brake failure (had to pussyfoot it home). -- Regards, Joerg http://www.analogconsultants.com/ |
#5
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Screws for disc brake caliper mounting?
On 2017-11-10 07:13, jbeattie wrote:
On Thursday, November 9, 2017 at 3:19:46 PM UTC-8, Joerg wrote: Missing a couple of screws for mounting adapters and calipers. The frame of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. For my flat mount brackets, I used standard SS cap screws purchased at the local hardware store. Those happen to be 5M, IIRC. The 6M caliper mounting hardware came with the brakes, and it looks like plated steel. No special alloys required. I don't think galvanic corrosion is a big deal with brake mounting hardware unless your roads are salted and you ride in snow. I do ride in snow but they don't use salt around here. I'll just use the Cd-plated steel screws then since that's also used on aircraft. -- Regards, Joerg http://www.analogconsultants.com/ |
#6
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Screws for disc brake caliper mounting?
On Fri, 10 Nov 2017 09:32:27 -0800, Joerg
wrote: On 2017-11-09 17:33, John B. wrote: On Thu, 09 Nov 2017 15:19:50 -0800, Joerg wrote: Missing a couple of screws for mounting adapters and calipers. The frame of the bike is aluminum. Do these have to be from some sort of space-age special material? The ones that came with the adapters (unfortunately only one pair each) are magnetic, so it's steel. Most of my M6 screws are Cadmium plated steel like they are used on aircraft. Will that do? I guess brass isn't sturdy enough. Anything else is locally unobtanium in metric size. Sure, I use stainless screws on my bikes. Mostly because there is a shop nearby that stocks both metric and imperial sizes from ~1mm up to about 1/2" in various lengths. Out here in the boonies the hardware store does not carry metric in stainless, only non-metric. Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). I use LiquiMoly mounting paste. It doesn't help locking but prevents seizing and allows quick adjustments or, as has happened, disconnecting them after a brake failure (had to pussyfoot it home). Actually anything that tends to insulate the screw from the base metal will limit or prevent galvanic corrosion - I even used the silicon goop that is used to stop leaks around window frames and two years later found no corrosion :-) -- Cheers, John B. |
#7
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Screws for disc brake caliper mounting?
On 2017-11-10 17:36, John B. wrote:
On Fri, 10 Nov 2017 09:32:27 -0800, Joerg wrote: On 2017-11-09 17:33, John B. wrote: [...] Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). I use LiquiMoly mounting paste. It doesn't help locking but prevents seizing and allows quick adjustments or, as has happened, disconnecting them after a brake failure (had to pussyfoot it home). Actually anything that tends to insulate the screw from the base metal will limit or prevent galvanic corrosion - I even used the silicon goop that is used to stop leaks around window frames and two years later found no corrosion :-) I found that the screws through the 7" extender that was factory mounted were threaded all the way. So I cut those to length and mounted it all. The bigger rotors feel great, especially on the rear where I went two sizes up. -- Regards, Joerg http://www.analogconsultants.com/ |
#8
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Screws for disc brake caliper mounting?
On Sat, 11 Nov 2017 07:09:11 -0800, Joerg
wrote: On 2017-11-10 17:36, John B. wrote: On Fri, 10 Nov 2017 09:32:27 -0800, Joerg wrote: On 2017-11-09 17:33, John B. wrote: [...] Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). I use LiquiMoly mounting paste. It doesn't help locking but prevents seizing and allows quick adjustments or, as has happened, disconnecting them after a brake failure (had to pussyfoot it home). Actually anything that tends to insulate the screw from the base metal will limit or prevent galvanic corrosion - I even used the silicon goop that is used to stop leaks around window frames and two years later found no corrosion :-) I found that the screws through the 7" extender that was factory mounted were threaded all the way. So I cut those to length and mounted it all. The bigger rotors feel great, especially on the rear where I went two sizes up. Most of the commonly sold smaller sized fasteners are "all thread" as I suppose that makes them almost universally "all fit" :-) I believe that some sizes, perhaps 6mm or larger, are also available with an unthreaded shank. -- Cheers, John B. |
#9
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Screws for disc brake caliper mounting?
On 2017-11-11 17:51, John B. wrote:
On Sat, 11 Nov 2017 07:09:11 -0800, Joerg wrote: On 2017-11-10 17:36, John B. wrote: On Fri, 10 Nov 2017 09:32:27 -0800, Joerg wrote: On 2017-11-09 17:33, John B. wrote: [...] Common stainless screws are generally not as strong as common steel so perhaps steel might be a better choice for brake attachment. I think I'd just use the steel bolts with a bit of anti-seize which would insulate them from the aluminum and prevent galvanic corrosion (which I think that you are worrying about). I use LiquiMoly mounting paste. It doesn't help locking but prevents seizing and allows quick adjustments or, as has happened, disconnecting them after a brake failure (had to pussyfoot it home). Actually anything that tends to insulate the screw from the base metal will limit or prevent galvanic corrosion - I even used the silicon goop that is used to stop leaks around window frames and two years later found no corrosion :-) I found that the screws through the 7" extender that was factory mounted were threaded all the way. So I cut those to length and mounted it all. The bigger rotors feel great, especially on the rear where I went two sizes up. Most of the commonly sold smaller sized fasteners are "all thread" as I suppose that makes them almost universally "all fit" :-) I believe that some sizes, perhaps 6mm or larger, are also available with an unthreaded shank. Typically the top part is unthreaded, maybe because that saves half a penny in production: http://www.jensonusa.com/Shimano-F18...Brake-Adaptor/ This is the kind of adaptor that was on there until Friday, just not from Shimano. -- Regards, Joerg http://www.analogconsultants.com/ |
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