Dumb Question on Metric Bolts - Page 5 - Fiberglass RV


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Old 04-05-2013, 12:12 AM   #57
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I didn't have a choice, since the tow hook ( a very large eye-bolt ) for a RAV4 is only available from Toyota.
Cost me $60.

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Old 04-05-2013, 08:13 AM   #58
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A tip: if you actually need a metric bolt for a vehicle, don't worry about whether or not the hardware store stocks it - get it from the auto dealership parts department (if it is original equipment, rather than custom work). Yes, it will be much more expensive that way, but paying that for a bolt or two won't kill you. OEM hardware is generally very good (especially from companies like Toyota), and in many cases it is very specifically suited to the application and so is more appropriate than even a correctly selected generic replacement.
Yes, actually I normally need metric bolts for my tractor or other non critical applications.

Incidentally when I worked in the auto business, we had a whole section (7 to 10 engineers) that specified fasteners for each application and were amazingly knowledgeable about all aspects of strength, corrosion resistance and torque retention. When you buy bolts by the millions, they are made to specification. I have noticed that the Japanese spend more money on plating for their bolts, which gives a nicer appearance after a few years.
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Old 04-07-2013, 08:34 AM   #59
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Having all measurements based on the most common substance in the world, water, makes things a lot easier.
I agree... did you ever hear the old saying "A pint is a pound, the world around".

If I remember correctly from many years ago, the meter was based on 1/10000th the distance from the North Pole to the equator. Later they realized that it was calculated incorrectly. They did not correct the unit and now it is based on a light wave length. Interesting that the most fundamental metric unit is based on a mistake.

Where are the metric units for the measurements used most often by the largest number of people in the world? Time. Why are there not 10 seconds in a minute, 10 minutes in an hour, 10 hours in a day, 10 days in a week, 10 weeks in a month and 10 months in a year? I guess they would be called things like centiyears and miliyears
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Old 04-07-2013, 10:36 AM   #60
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Where are the metric units for the measurements used most often by the largest number of people in the world? Time. Why are there not 10 seconds in a minute, 10 minutes in an hour, 10 hours in a day, 10 days in a week, 10 weeks in a month and 10 months in a year? I guess they would be called things like centiyears and miliyears
Good musings, with definite merit. It sure would simplify things. You do have to take into account that the year is driven by our elliptical orbit, and the frequency it repeats, and is not equally divisible by 10, and a day is determined by the rate the world spins. Though a day could easily be broken down into decimal units. I do remember when the metric system was being introduced here, and my dad asking what they planned to do for time measurement.
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Old 04-07-2013, 11:15 AM   #61
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... did you ever hear the old saying "A pint is a pound, the world around".
Yes. Ironically, it's not quite true: there are variously sized volume measurements called a "pint", and of course it meant a pint of water (only). I won't even get into weight versus mass...

The SI (metric) equivalent is that a litre of water has a mass of one kilogram... approximately. I agree that this is occasionally convenient, but I think it is unimportant compared to the rest of the consistency within the SI units. That consistency is most appreciated when doing technical calculations, so the average person doesn't appreciate it in the activities of daily life.
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Old 04-07-2013, 11:39 AM   #62
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Originally Posted by Brian B-P View Post
A tip: if you actually need a metric bolt for a vehicle, don't worry about whether or not the hardware store stocks it - get it from the auto dealership parts department (if it is original equipment, rather than custom work). Yes, it will be much more expensive that way, but paying that for a bolt or two won't kill you. OEM hardware is generally very good (especially from companies like Toyota), and in many cases it is very specifically suited to the application and so is more appropriate than even a correctly selected generic replacement.
Yes but, a dealership is a $60 ferry ride away, the hardware store is just down the road. A OM bolt gets relly pricey that way.
cheers
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Old 04-07-2013, 11:43 AM   #63
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If you buy one from the dealer, perhaps the future purchases could be mailed?? I find dealers, today, are more apt to bend a little for you more so than years ago.
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Old 04-07-2013, 12:02 PM   #64
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The SI (metric) equivalent is that a litre of water has a mass of one kilogram... approximately.
'tis exactly equal under standard conditions. These measurements are the basis for the metric system developed by the French way back.

For those not familiar, this is is a bit of an how different metric measurements correlate..

For water: 1cm x 1cm x 1cm = 1cm^3 (or 1cc) = 1 milliliter = 1 gram

This simple correlation of length, volume and weight measurements is what makes the metric system easy to use in many aspects of life.

For measuring energy, calories too are much simpler than BTU's as 1 calorie is simply the energy amount of required to raise one gram of water through one degree centigrade.
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Old 04-07-2013, 04:06 PM   #65
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For measuring energy, calories too are much simpler than BTU's as 1 calorie is simply the energy amount of required to raise one gram of water through one degree centigrade.
The BTU is simply the energy amount required to raise one pound of water one degree Fahrenheit.

Talk about confusion, there is a small calorie and a large calorie, the large calorie is equal to 1000 small calories. I just don't see how the metric system is any easier. It just uses different numbers, maybe the math is a little bit simpler because it is base 10. But then it is easy to get the decimal in the wrong place. Many of the recent scientific advances that affect people the most have been in base 2 (computers). In my opinion the metric system is the solution to a problem that doesn't exist.
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Old 04-07-2013, 04:53 PM   #66
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I knew that about the BTU, it was the unit measurement I first used. The pound though does not directly correlate to other units of measurement in the Imperial system as they do in metric.

I have done numerous calculations using calories at school and work, and have never heard of two sizes. Maybe it was in one of the classes I skipped to go skiing.

I have extensively used both systems, Imperial a lot more than Metric, but by far prefer the simplicity of the metric system. There just might be a good reason that all the developed countries in the world use the metric system, except one. Any guesses?
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Old 04-07-2013, 11:07 PM   #67
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I have done numerous calculations using calories at school and work, and have never heard of two sizes. Maybe it was in one of the classes I skipped to go skiing.
The big calorie is the food one. I did not realize it was a 1000:1 Cool!
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Old 04-08-2013, 06:56 AM   #68
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The big calorie is the food one. I did not realize it was a 1000:1 Cool!
'splains things then, I have never counted those ones.
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Old 04-08-2013, 07:08 AM   #69
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I guess I have enough calories around my waist (waste) to fuel a nuke sub for a year.
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Old 04-08-2013, 08:49 PM   #70
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Back in the dark ages, when I was in college, a friend and I decided to re-label our speedometers in more obscure units. He chose furlongs per fortnight for his Packard and I converted to light years per picosecond for my Honda motorcycle. It made for interesting conversations with the local minions of the law when they pulled us over for exceeding limits posted in more mundane units. When they told me I was exceeding 60 MPH I just asked them if they could convert that to the units shown on my speedometer. Yes, we did have speedometer faces labeled in the units of our choice. I even offered my slide rule to assist them in the calculation.

I guess we had too much free time on our hands back then.

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