The picture of the eyebolt at the below link appears to exactly match
what MAM originally sent to me. The problem with that bolt is that
there are threads all the way along the bolt. The "grip length" or
non-threaded portion of the bolt is very short, e.g. less than 3/8". As
you all know, the threads act as stress focus points. I ended up
sending this bolt back to MAM.
I do have a question on the below comment: What is the difference
between placing the bolt in the "inboard" versus "outboard" holes? They
are so close together why would that matter?
Thanks!
Ted Waltman
Moose 142SR
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of
Ken
Sent: Thursday, July 08, 2004 9:51 AM
To:
rebel-builders@dcsol.com
Subject: Re: Strut Fitting & wing tiedown bolt
http://www.wichard.com/catalogue/catalogue_en.php
FWIW that link shows a photo of a forged stainless eyenut. While I
didn't find it on the American site, I have in my hand part number 6341
which has a 5/16-18 thread, and a 0.71" rope hole. It was a bit pricey
at about cdn$20. from West Marine. From memory it is rated at 7700 lb
load parallel to the bolt. That is more than twice as strong as the 1/4"
bolt part.
However the strength of these things is apparently much much less for
offset loads. Round rings and and especially rings with wide flanges
(large diameter nut) like this retain more of their rated strength when
loaded offcenter. I'll probably put a short aluminum spacer under it.
Any forged part should be much stronger than a welded part of course.
MAM's welded eyebolt has a 5/16" stainless bolt so I have no problem
using a 5/16" bolt although I will drill out one of the inboard holes in
the strut fitting, not one of the outboard holes.
OTOH since I've never heard of a problem with the welded eyebolts that I
have from MAM, perhaps I should have just used those ;)
Ken
rickhm@comcast.net wrote:
Great find, but minor error on the part number S0322-0007.
Rick Muller
SR70
-------------- Original message --------------
For those wanting to use a "D" shaped eyenut with a grade 5 bolt to
maitain
the full strength of all strut bolts there is a 316 Stainless Steel
forged
Lifting Eyenut with a 1" x 3/4" hole in 1/4 inch (and larger) with
UNC >>thread available from Bosun Supplies Co PO Box 1283 Teaneck New
Jersey >>07666. Ph (201) 837 7007 Fax (201) 837 5999. >> >>The 1/4"
eyenut is Item No S03222-007 for a cost of about US$7.00 ea >>available
on the internet at
www.bosunsupplies.com. You will find them >>referred
to as "forged eyenuts" under eyenuts which will bring up the >>picture
but it is easy to miss. >> >>I gave up on the local marine shops last
year and scoured the internet >>before I found them. There may be
alternative "D" shaped eyenuts
around but
they wont be easy find.
snip
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