Bolt Head Sizes [Could someone do a quick ETKA check for me?]

[Ben Swann]

Huw,

"VAG's 8-10-13-15-17 approach to hardware" is not consistant, especially in later years.

While 6, 8, 10, 13, 15, 17, 19 are most common, you will find  5, 7, 9, 11, 12, 14, 16
18 and variety of sizes beyond 19mm on 200's, Coupe Quattros and others.  Sometimes it
is a corresponding SAE size on parts from system OEM's in USA ( I think).

My recall:

 5 - mostly used on hex cap bolts.
 7 - hose clamps - all cars that have been worked on and had clamps replaced.
 9 - it happens rarely -  one of the bleeder screws on some models AFAIR.
11 - brake lines and bleeders on Ur Quattro, and 200 rear calipers
12, 14 - Bleeders fittings V8, 200, fuel lines and other lines using line wrenches -
even fuel injectors on 4000 use 12 and 14mm as I recall.
16 - control arm bolts - the new ones from the dealer ( old ones 17mm).  Found this out
by oops!  I now start by trying 16 and then use 17 if it doesn't fit.
18 - forget where, but had to use recently on the 200Q V8 transmission swap - think it
was an odd bell-housing bolt or starter bolt.

20, 21, 22, 23, 24 - Oil, Hydraulic, AC hose fittings, oil pump bolt., other.

27 - axle bolts, crank bolt, other.

YMMV but I generally have and use all sizes 3mm and from 5mm to 32mm on Audi's from '83
to '96 that are cars I've serviced.  

Is there a FAQ, WIKI or place to place/reference this sort of info.?  

Ben

[Date: Sat, 23 Oct 2010 22:44:13 -0400
From: Huw Powell <audi at humanspeakers.com>
Subject: Re: Could someone do a quick ETKA check for me? audi audi
	audi full	of audi content fcol
To: rob <rob3 at hod3.fsnet.co.uk>
Cc: quattro at audifans.com
Message-ID: <4CC39D7D.1010802 at humanspeakers.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

> the CGT bolts are 5mm longer of which the extra length is in the threaded portion. One
other difference is that the CGT item has a 16mm  Hex head for some reason whilst the
type 44 bolt has 17mm - for what reason I have no idea.

You're kidding, right?  I have *never* used my 16mm sockets or wrenches. 
In fact, I have whole swaths of wrench and socket sets that have never been touched, due
to VAG's 8-10-13-15-17 approach to hardware.

--
Huw Powell]