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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Identifying nut needed, can only see bolt thread
On my boat there are zinc anodes held on by embedded bolts,
one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Justin. |
#2
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Identifying nut needed, can only see bolt thread
On May 24, 5:39*pm, Justin C wrote:
On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. * *Justin. The usual method is to buy a thread guage. It has little flat tabs with various threads cut into it/ You offer them up to the bolt to identify the pitch of the thread. http://www.toolfastdirect.co.uk/acat...h_Guages_.html |
#3
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Identifying nut needed, can only see bolt thread
On 24/05/2012 18:23, harry wrote:
On May 24, 5:39 pm, Justin wrote: On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Justin. The usual method is to buy a thread guage. It has little flat tabs with various threads cut into it/ You offer them up to the bolt to identify the pitch of the thread. http://www.toolfastdirect.co.uk/acat...h_Guages_.html Yep, just what I was going to say. Other than that, you could try some similar size nuts to see which one fits, but the the thread gauge is the best way. |
#4
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Identifying nut needed, can only see bolt thread
On Thursday, May 24, 2012 5:39:12 PM UTC+1, Justin C wrote:
On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Justin. If you've measured the diameter and the thread pitch or number of threads per inch then something like http://www.efunda.com/DesignStandards/screws/screwm_coarse.cfm (they also have pages with imperial threads on) may help you find a likely candidate (remembering that the diameter as measured will almost certainly be smaller than the nominal diameter) Mike |
#5
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Identifying nut needed, can only see bolt thread
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#6
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Identifying nut needed, can only see bolt thread
"Justin C" wrote in message ... On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? take a nut off another anode, check it fits the one with the missing nut, then take the nut to a nut and bolt shop to get more of the same. |
#7
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Identifying nut needed, can only see bolt thread
"Justin C" wrote in message ... On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? take a nut off another anode, check it fits the one with the missing nut, then take the nut to a nut and bolt shop to get more of the same. I second that idea. Mike |
#8
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Identifying nut needed, can only see bolt thread
On 2012-05-24, harry wrote:
On May 24, 5:39Â*pm, Justin C wrote: On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Â* Â*Justin. The usual method is to buy a thread guage. It has little flat tabs with various threads cut into it/ You offer them up to the bolt to identify the pitch of the thread. http://www.toolfastdirect.co.uk/acat...h_Guages_.html I've never heard of such a thing, what a marvellous idea. Thank you for the suggestion. The boat was built in the UK, around 1980, is it likely that a commercial builder of the time would still be using Whitworth, and not metric? I'm just trying to narrow the gauges I should buy. Justin. |
#9
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Identifying nut needed, can only see bolt thread
On 2012-05-25, Gazz wrote:
"Justin C" wrote in message ... On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? take a nut off another anode, check it fits the one with the missing nut, then take the nut to a nut and bolt shop to get more of the same. There is an anode on the opposite side, the fittings were the same, that might be an option. Thank you for the suggestion. Justin. |
#10
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Identifying nut needed, can only see bolt thread
"Justin C" wrote in message ... On 2012-05-24, harry wrote: On May 24, 5:39 pm, Justin C wrote: On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Justin. The usual method is to buy a thread guage. It has little flat tabs with various threads cut into it/ You offer them up to the bolt to identify the pitch of the thread. http://www.toolfastdirect.co.uk/acat...h_Guages_.html I've never heard of such a thing, what a marvellous idea. Thank you for the suggestion. The boat was built in the UK, around 1980, is it likely that a commercial builder of the time would still be using Whitworth, and not metric? I'm just trying to narrow the gauges I should buy. Plenty on the bay, dirt cheap. |
#11
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Identifying nut needed, can only see bolt thread
On 2012-05-27, scorched was bm wrote:
"Justin C" wrote in message ... On 2012-05-24, harry wrote: On May 24, 5:39 pm, Justin C wrote: On my boat there are zinc anodes held on by embedded bolts, one has lost it's nut. How can I identify the nut needed from only the thread? I can measure the diameter, and can measure the number of turns over a set distance. Is there a site I can look up stuff like this? Removing the embedded bolt and bedding a new one is well beyond a job I'm happy to tackle. Of course, this may all be moot, I may find, when the boat's lifted, that the bolt has been eaten away because there was no anode on it (I hope others in the area have compensated). Thank you for any advice you can give. Justin. The usual method is to buy a thread guage. It has little flat tabs with various threads cut into it/ You offer them up to the bolt to identify the pitch of the thread. http://www.toolfastdirect.co.uk/acat...h_Guages_.html I've never heard of such a thing, what a marvellous idea. Thank you for the suggestion. The boat was built in the UK, around 1980, is it likely that a commercial builder of the time would still be using Whitworth, and not metric? I'm just trying to narrow the gauges I should buy. Plenty on the bay, dirt cheap. But are they also nasty - as in: inaccurate? I'd rather try a reputable source for a quality product. Justin. |
#12
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Identifying nut needed, can only see bolt thread
On Sun, 27 May 2012 09:45:16 +0100, Justin C
wrote: I've never heard of such a thing, what a marvellous idea. What an interesting post. I had to identify an unknown thread last week and hadn't heard of these either. In my case, I measured the width of the bolt and tried to match it against tables I found from googling "screw thread". I think I may have used results from wikipedia because it was a web site I had heard of, unlike the other search results. The gauge seems to add a layer of complexity because you have to measure the thread pitch and then look at a table to translate that to diameter though. What's wrong with my method of measuring just the diameter with a vernier calliper or micrometer? I suppose one flaw might be that just measuring the diameter would not tell you whether it was a 55 degree or 60 degree thread. Are there other flaws? It seemed to work at the time to identify a 3/16" unc for me but I might buy a gauge for next time. Thanks. |
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