A step up from Bunnings, but perhaps useless to you...
Just called McMaster and found out they will ship to Australia if
it's to an Australian branch of a company that already has a US account
with them. It may also be possible for an Australian company to start up
an account. For this contact their customer support. No shipping to
personal accounts overseas, for example to me if at an Australian address.
McMaster stocks lots of useful hardware and raw materials (ie a block
of 2024-T3 in my last order). They ship immediately. Even if I order in
the afternoon with standard shipping, the package arrives at my house
the next day.
Jim
McMaster-Carr:
http://www.mcmaster.com/#din-931-cap-screws/=wcl7l7
On 3/17/2015 3:11 AM, Anthony Smith wrote:
G’day Graham
I posted the original request.
Fortunately no-one responded with the ‘Bunnings Aerospace’ answer. ; )
I understand the specs required and SAGA has an arrangement in place
with Coventry Fasteners for the supply of these to SA owners.
My problem is with the shank length. The 6mm bolts readily available
through reputable suppliers come in 5mm increments. I have a number
of bolted connections where the nearest bolt size is ~1mm or so too
short. Going up a size to get sufficient shank length means having
some 4 washers onto the end of the bolt. Very annoying. I have heard
through the grape vine that others had experienced similar problems on
some aircraft. It may well be that you can get the DIN 931 bolts in
Europe in shorter increments.
The aircraft spec 6mm bolts come in shank length increments of 1 or 2
mm (depending on bolt length). The thread length is also 10mm, which
is substantially shorter than the 20mm of the readily available bolts
and saves having to hack saw off the excess. There are also options
to have holes in the thread for split pins and/or holes in the bolt
head for lock wire.
I have identified too European aircraft bolt part numbers that may
suit. EN2889-060XXX is a 6mm aircraft bolt equivalent of the DIN931
(the XXX refers to the shank length) and has very similar tolerances
on the dimensions. Minor exception is that it is 900 MPa rather than
800 MPa in strength.
The other is EN2859-060XXX. This is an 1100MPa bolt with a close
tolerance shank. This is my preferred bolt as the close tolerance
shank will have a much better fit with bearings and lugs and will
reduce slop in the control system a tad. No doubt the higher strength
and the tighter tolerances will result in a higher price per bolt.
I have approached the logisiticians who work next door at Airbus Group
Australia Pacific and they are happy to quote a price on the supply of
the bolts. I will discuss further with the SA RTO-Air if we want to
find some of the common shank lengths that are typically needed and
see if we can bring a batch into the country at a reasonable price.
Regards
Anthony
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of
*Graham Holland
*Sent:* Tuesday, 17 March 2015 8:59 AM
*To:* [email protected]
*Subject:* [Aus-soaring] Bolts
A recent posting revealed some difficulty in sourcing bolts for
gliders. I didn’t think they were that arcane. Basic Sailplane
Engineering (BSE) says that “All German and some other European
gliders use bolts that have been manufactured to a DIN specification.”
(p.1.5.1) and that the most common bolt meets DIN 931. So how easy is
it to buy such a bolt?
Din 931 has been superseded by ISO 4014-2011, Hexagon head
bolts-product grade A and B. This is identical to AS 1110.1-2000, ISO
metric hexagon headed bolts and screws - product grade A and B –
bolts. Many Australian fastener suppliers such as Coventry Fasteners
(aka Konnect), Tower Fasteners and James Glen supply high tensile
steel bolts to AS 1110.1. Stainless steel bolts to DIN 931 are also
available. So it seems to be more a matter of bolts for aircraft
rather than aircraft bolts.
I would expect glider manufacturers to specify bolts, but I could not
find any reference to a bolt specification in the maintenance manual
for the Duo Discus and PW5 (they were to hand). Where would it be?
Graham
Graham Holland
27 Johnston Crescent
Lane Cove NSW 2066
Australia
02 9427 3282
[email protected] <mailto:[email protected]>
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