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

[John Cody Forbes]

18's are on the engine mount bolts on transverse mounted 1.8t's (you have to take the mount off to do the timing belt). I don't think there is a 20mm on any VAG product I've ever seen because I know I don't own a 20mm wrench nor socket and I've been dug into every VAG model made since 1986.

I actually just encountered my first ever 9mm yesterday on a E60 BMW holding the window switches to the drivers door. BMW also uses 21mm for most of the rear suspension bits on many cars.

-Cody (mobile)

On Oct 24, 2010, at 10:35 AM, "Ben Swann" <benswann at verizon.net> wrote:

> 
> 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]
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