Re: [MV] reading nuts and bolts

loxman (loxman@hurricane.net)
Sat, 26 Jun 1999 19:14:04 -0700

to define class a little further,
class one threads are an interference fit and the wrench MUST be used to put
the nut on the bolt.
class 2 threads are tight, but can be put on by hand,
class 3 threads are the normal ones and are a pretty sloppy fit.

-----Original Message-----
From: Edward Greeley <etgreeley@worldnet.att.net>
To: Dean L. Kellogg, Jr <kelloggd@uthscsa.edu>
Cc: mil-veh@skylee.com <>
Date: Friday, June 25, 1999 8:20 PM
Subject: Re: [MV] reading nuts and bolts

>3/8 (diameter) -24 (threads per inch) NF (National Fine) -3 (class 3
>fit) x 3/4 (length)
>
>Note that the CLASS of fit (class 3 in this case) is NOT to be confused
>with the strength GRADE, which is not specified in this example. The
>class of fit relates to how "sloppy" the fastener fits on/in its mating
>fastener. I would imagine the stated application would call for a grade
>5 bolt, or higher (stronger).
>
>Ed Greeley
>
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