Just wondering if there is a trick to knowing ahead of time which fasteners are metric, and which are standard?
metric or standard?
BioTex
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For the most part Metric Bolts will have the bolt strength marked on the bolt head something like 8.8 or 10.9 the higher the number the stronger the bolt,While American Bolts usually have the bolt strength marked on the bolt head as a series of hash marks the more hash marks the stronger the bolt example a Grade 8 bolt will have 5 hash marks and is about the same strength as a Metric 10.9
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A grade 8 bolt has 5 hash marks.
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You are correct,I edited My post.
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In my experience, most of the factory hardware is metric. After just going through and doing a body lift, motor mount lift, springs and shocks I can tell you that I only ran into standard fasteners in two places: the body mount bolts and the lug nuts on the wheels. The spark plugs are standard. Everything else that I've put a wrench on has been metric or a specialty fastener, i.e. Torx or internal hex.
My rule of thumb is if it's on the drivetrain, which includes the engine, transmission, transfer case, and axles, it's SAE. If it's anthing else, it's probably metric. Though every time I crawl under the Jeep to do something and try to outthink it by bringing only my SAE or metric tools depending on what I'm working on, it bites me and I have to get back up and get the other set of wrenches.
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Get a tool chest on wheels. I did, and it saves the 800 trips across the garage I was otherwise accustomed to making.
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The parts list shows a fair number of thread sizes so can help for a number of them. Follow the link in my sig to get yourself a copy. SAE threads are listed as numerical fractions eg .437-14 (.437" x 16 = 6.992 so 7/16"). So you'd need to figure out the actual fraction from the numerical value.
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Or Whitworth? I have an old wrench in my box that I thought for many years was mistakenly marked. One day someone told me what it was. I'm joking by the way. I can just see some assembly line worker slipping one of these on a new jeep, and secretly laughing inside.
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This seems right. Things that Chrysler sourced as relatively standard parts (e.g., axles) from vendors tend to be SAE; the rest tends to be metric.
I think a combo of Jerry's and FarmerinVA's thinking is probably the best take on the situation...
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