On Wed, 19 Apr 2017 10:04:13 +0700, John B Slocomb
wrote:

On Tue, 18 Apr 2017 16:32:48 -0400, wrote:

On Tue, 18 Apr 2017 18:56:17 +0700, John B Slocomb
wrote:

On Tue, 18 Apr 2017 00:08:14 -0400, wrote:

On Tue, 18 Apr 2017 10:29:32 +0700, John B Slocomb
wrote:


If you want to talk length then yes. A bolt should be long enough that
one complete thread will be extend past the nut. but there is not
maximum length, un less, or course it hits the other side of the
automobile.


This is not true with AN hardware.AN hardware is spec'd by it's
diameter and grip length -and there is a stringent spec as to how much
thread must/may extend beyond the nut. You NEVER have threads within
the "grip"


Something must have changed with those AN people after the twenty
years I spent fixing their airplanes because the "one thread past the
nut" rule was certainly followed then. I've personally seen an Air
Force Inspector turn down an installation because the bolt didn't
protrude past the nut. (Which is likely why I remember it :-)

You didn't read my whole post Slocumb.

I was responding to the " but there is not
maximum length, un less, or course it hits the other side of the
automobile.

AN bolts need to be the EXACT length required. No more than 2 washers
allowes to adjust the protrusion of the thread through the nut.

If it doesn't protrude OR protrudes too much it fails. (at least here
in Canada)

As I said, for 20 years I fixed my uncles airplanes and I can assure
you that AN nuts and bolts weren't quite as exact as you seem to think
that they are. Certainly one was supposed to not use more than one
washer under the head and the nut but there was no restriction about
how much stuck out of the nut, as long as it was at least one thread.

You are imagining some perfect place where everything is wonderful
when in reality it is 23:30 and a B-52 with two Nukes aboard that
either gets off the ground by 24:00 or it misses its rendezvous and
the aircraft to be relieved won't have sufficient fuel to get home and
another tanker will have to be launched....
I'm just going by the rules I need to follow when building my own
plane up here. The MDRA looks for "good workmanship" and that means
using the right bolts. The bolts come in multiples of 1/8 inch, and
that allows getting the length accurate to within 2 washer thicknesses
(one on each end) with no problem at all. It DOES require having a
good assortment of bolts and washers available though.

The Naval Ship's Technical manual states "A good rule to follow is to
always use the shortest standard length fastener that gives a minimum
one thread protrusion"
From the EAA:
Certain accepted practices prevail concerning the installation of
hardware. A few of these regarding bolt installation follow:
•In determining proper bolt length - no more than one thread should be
hidden inside the bolt hole.

•A typical installation includes a bolt, one washer and a nut.
•If the bolt is too long, a maximum of three washers may be used.
•If more than three threads are protruding from the nut, the bolt may
be too long and could be bottoming out on the shank.

In Canada the MDRA will flag a bolt with over 3 threads showing on
inspection.