What type of hex nut for vintage brakes?
03-14-21, 11:03 AM
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What type of hex nut for vintage brakes?
Hey all, just curious what type of acorn nut I should be looking for online to replace some worn sidepull brake nuts on a vintage bike - is there a standard size that I can buy on ebay or elsewhere?
Thanks
Sorry for the dirt, it's spring and dirty out!
Thanks
Sorry for the dirt, it's spring and dirty out!
03-14-21, 11:08 AM
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I'd take the nut and bolt to a local hardware store or LBS to find the proper nut. You'd probably spend less $ and perhaps less time, assuming you're close to a good store
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03-14-21, 01:35 PM
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You don't necessarily need an acorn nut. Any nut which fits the threads will work. .
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03-14-21, 05:21 PM
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The threading is almost certainly M6x1.0mm. An Acorn nut will protect the ends of the threads and prevent scratches if you happen to rub your leg or arm against it but is certainly not essential.
And, btw, clean those brakes!
And, btw, clean those brakes!
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03-14-21, 06:36 PM
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Don't think so. More likely M5 (5mm diameter by .8mm pitch). These anchor bolts are commonly found in two bolt sizes, the M6 that phipbob57 mentions and the M5. Most every M6 bolt anchor bolt I have laid my wrenches on (count is in the thousands over the nearly 50 years of wrenching) has a 10mm nut (as in 10mm across the nut's flats). The M5 bolts generally have an 8mm nut (as is imaged) or a 9mm nut. Those Shimano calipers are the M5 version, IME.
An acorn nut isn't needed but will help retain the OEM look (if that's important). A Nyloc nut will have a sort of rounded side, where the nylon ring is held, but stay put far better. Most all hardware store nuts will be either the common flat on each side with no locking element or the Nyloc versions. In metric nuts the popularity of acorn nuts is so small that most non bike shops won't stock such a slow seller (that also limit the bolt length to the "just right" need of length). better LBS that are service focused likely have a stash of used acorn nuts that will also have a used patina for that real dated look too. Andy
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03-14-21, 07:30 PM
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Don't think so. More likely M5 (5mm diameter by .8mm pitch). These anchor bolts are commonly found in two bolt sizes, the M6 that phipbob57 mentions and the M5. Most every M6 bolt anchor bolt I have laid my wrenches on (count is in the thousands over the nearly 50 years of wrenching) has a 10mm nut (as in 10mm across the nut's flats). The M5 bolts generally have an 8mm nut (as is imaged) or a 9mm nut. Those Shimano calipers are the M5 version, IME.
An acorn nut isn't needed but will help retain the OEM look (if that's important). A Nyloc nut will have a sort of rounded side, where the nylon ring is held, but stay put far better. Most all hardware store nuts will be either the common flat on each side with no locking element or the Nyloc versions. In metric nuts the popularity of acorn nuts is so small that most non bike shops won't stock such a slow seller (that also limit the bolt length to the "just right" need of length). better LBS that are service focused likely have a stash of used acorn nuts that will also have a used patina for that real dated look too. Andy
An acorn nut isn't needed but will help retain the OEM look (if that's important). A Nyloc nut will have a sort of rounded side, where the nylon ring is held, but stay put far better. Most all hardware store nuts will be either the common flat on each side with no locking element or the Nyloc versions. In metric nuts the popularity of acorn nuts is so small that most non bike shops won't stock such a slow seller (that also limit the bolt length to the "just right" need of length). better LBS that are service focused likely have a stash of used acorn nuts that will also have a used patina for that real dated look too. Andy
Most any custom type motorcycle shop (think Harley) will also carry chromed metric acorn nuts.
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