Follow up on Spacers

[ccohen5]

Good rule of thumb but aerospace still uses 50% of bolt length for aluminum
and steel.  Inconel, Titanium and special stainless can be 1.5 X diameter of
threaded section and less in low torque environments.

Colin
----- Original Message -----
From: "alan pritchard" <alanthecelt at alanthecelt.screaming.net>
To: "ccohen5" <ccohen5 at compuserve.com>; <urq at audifans.com>; "Audi S Car
List" <s-car-list at audifans.com>; "qlist" <quattro at audifans.com>
Sent: Wednesday, May 22, 2002 2:44 PM
Subject: Re: Follow up on Spacers


|
| A good rule of thumb is 1.5x bolt diameter into the female thread minimum,
| ie 10mm bolt should be threaded into the hub. after all there is no
| additional strength to be gained if the thread contact area is greater
than
| the cross sectional area of the bolt.
| ----- Original Message -----
| From: "ccohen5" <ccohen5 at compuserve.com>
| To: <urq at audifans.com>; "Audi S Car List" <s-car-list at audifans.com>;
"qlist"
| <quattro at audifans.com>
| Sent: Wednesday, May 22, 2002 1:12 AM
| Subject: Follow up on Spacers
|
|
| > Thanks to everyone who responded to my request for info on what and
where
| to
| > find these.  Seems that 5mm H&R is the preferred product and
| > http://www.ecstuning.com/ seem to be the only place supplying over the
web
| > although 2 Bennett and others will supply based on a phone order.
| >
| > An important thing that no one mentioned but I picked it up from ecs, is
| > that the bolt length needs to be able to accommodate the spacer.  I
think
| > 5mm will not impact the integrity of the bolt, but I am going to check.
| > There is a formula in aerospace that says at least half the length of
the
| > bolt should be in threaded contact with the female part of the fastener
| > without requiring special materials to compensate for high stress
torque.
| >
| > A friend of mine drove a '70 Mini for three years with only 3 of its 4
| bolts
| > on the front LH wheel, and one of those was finger tight.  Said he never
| > noticed a thing!  So in all probability this connection point is over
| > engineered!
| >
| > Colin
| >
|