[C320-list] Bolt size specification needed, please

[Allan S Field]

Graeme - I will call Catalina, ask them, and get back to you later today or
Monday.  OK?

Allan S. Field
Sea Shadow - C320
Columbia, MD

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Graeme Clark
Sent: Friday, November 14, 2014 4:47 AM
To: c320-list at lists.catalina320.com
Subject: [C320-list] Bolt size specification needed, please

Hi everyone - someone once said of Britain and the USA that we are two
nations divided by a common language! I need help  because my boat was built
in the US (obviously!) presumably using US nuts and bolts but over here in
Britain we have been metricated for some years so I am having trouble
finding equivalent bolts to replace my engine mount mounting bolts (ie the
ones that hold the mounts to the bearers that are glassed into the boat)

I found that I can use a 14mm spanner to undo them - its not a perfect fit,
I guess the actual size across flats is a little bit less than 14mm. They
are coachscrews that look roughly like this
http://img.auctiva.com/imgdata/1/8/2/9/8/6/7/webimg/732578281_o.jpg

Because I am replacing my engine mounts with a different mount that has a
thicker base, I need a slightly longer screw to penetrate the bearer to the
same depth. I assume the bearer is wood  and i want to obtain screws with
the same thread pitch and diameter so that I dont end up cutting a new
thread over the old, which will greatly weaken the attachment.

I am guessing that catalina will have used a stainless version of a standard
off-the-shelf coachscrew available in pretty much any US hardware store -
can anyone tell me what the specification is?

Thanks

Graeme
'Jaskar', #366, Falmouth, Britain