very easy(usually), metric bolts have DIN number on bolt head ie 8.0,
8.8, 10.0 and so on. this number signifies hardness and the hardness
increases with the number.
unified (which I call SAE, Murican, and the way things ought to be in
this world!) are graded with hash marks and are called grade 4,5,6,8
with 8 being very hard. no mark means soft or junk or from the farm
store (no offense, I like farm stores!)
aircraft (AN) are (almost) always a fine thread and the diameters are
respectful of the Murican, SAE convention but (almost) always have an
"X" on top and are superior in tenstile strength.
metric bolt pitch is signified in threads per mm. 1.00, 1.25, 1.50
remember, when it comes to fasteners the term "always" is never used
Talk about timing. I said this in jest and guess what arrived in the mail
yesterday? They sure make it hard to say no when they offer such nice
gifts, indluding address labels with the Handyman logo. Maybe if I sign up,
I can be a tool tester and get a free X-5 Unisaw.
On 22 Feb 2004 10:25:04 -0800, email@example.com (ubhat) wrote:
Well yes and no. You need a set of (English and metric) thread gauges
which will tell you (by looking carefully) the English or metric size.
Without the gauges, you could count the threads against a ruler with
both English and metric divisions.
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