Odd fixing sizes...

[remmington]

Wheel nuts.
15mm Hex Smartcars
22mm Hex Land Rover Discovery-Freelander, BMW X5
 
Cylinder head bolts.
Ribe M9 Fiat, VAG
Ribe M10 x 140mm VAG 1.8-2.0 V6
Ribe M12 x 120mm Fiat
Ribe M13 x 100mm Alfa, Fiat Lancia
Ribe M14 Fiat
Spline M9 Toyota
Spline M10 x 140mm Mercedes Sprinter
Spline M12 VAG, Ford, GM, Mercedes
Spline M14 VAG, Ford, Rover (plus Ford & VAG gearbox bellhousings)
E12 Female Torx BMW M42-50
Torx T50 Ford, Citreon
Torx T60 Ford 1.8Di
Torx T55 Renault
Torx T70 Ford
9mm Hex key VAG
M12S Special 6 point Nissan
M8S Special 6 point Nissan head and balance shaft bolts
 
Toyota Idle pulley centre bolt
M10S Special 6 point
 
Nissan Renault Clutch
M6S Special 6 point
 
Nissan Balance shaft bolt
8TS Special female 3 point
 
Smartcar brake socket (plus some GM cars)
Five sided 14mm female socket

Brake socket
Five sided 10mm pentagon (assorted caliper bolts)

Citroen Peugeot Renault brake socket
Five sided 19mm pentagon

Nissan fuel pump
Five sided 12.5mm pentogon
 
Honda Civic lower control arms
20mm 10 point socket
 
New type Bosch freewheel alternators.
Torx T50 x long
Spline M10 x long
 
Modern clamp type diesel injectors.
11mm x 100mm Hex key
 
Spline type sparkplug
Super long spline socket Citroen C5 fitted with Bosch 385R6 plugs
 
Hub nuts.
30mm Six-sided deep socket VAG, Citroen, Fiat, Ford, Lada, Peugeot, Renault, Talbot, GM
30mm Shallow bi-hex VAG
32mm Six-sided deep socket Audi, Citroen, Fiat, Ford, Lancia, Peugeot, Renault, Talbot
33mm Six-sided deep socket  VW late Golf front axles
35mm Six-sided deep socket Citroen BX, Rover, Peugeot J7-9
35mm Shallow bi-hex VAG T5
36mm Six-sided deep socket Alfa, Volvo, Citroen, Peugeot, Lancia, VAG (plus Saab ABS brakes & GM clutch bolts)
41mm Six-sided deep socket Alfa, Citroen, Peugeot, Fiat, Ford
45mm Six-sided BMW 5-series, LDV vans
46mm Six-sided BMW 3-series
50mm Bi-hex Transit 80-100-115-120 1988-on
52mm Six-sided Range Rover, Land Rover
56mm Deep bi-hex Transit 130-150-190 1993-on
65mm Bi-hex thin wall Transit 130-150-190 pre-1993
Spline M18 Tamperproof VW late Golf rear hubs
 
Headlight aligning adjusters.
Ribe M7 x 200mm Alfa, Fiat, Lancia

Early VAG clutches
9mm female spline
 
Oil filters.
38mm Six-sided GM Vectra 2.0D
27mm Six-sided-shallow Mercedes A-Class
24mm Six-sided-shallow BMW V8 engines 2004>
 
Drain plug keys.
Triangular bit Renault
10mm Female Sq BMW, Ford, Renault, Toyota
12mm Male Sq Alfa, Fiat, Lancia
10mm Male Sq Peugeot, Citroen , Renault, Volvo
5mm Hex key Mercedes
Spline M16 Tamperproof VAG
 
VAG late doorhandles.
Spline M4
 
Fuel filter thru bolts.
13mm x 100mm Hex key Fiat, VAG
 
Gearbox sump covers.
Ribe M8 x long Alfa, Fiat, Lancia
 
Idle speed adjuster
Female E4 socket (tiny) Citroen Saxo (
 
Motorcycle wheel spindles.
24mm Hex key Suzuki-Honda
22mm Hex key Kawasaki
19mm Hex key Yamaha
 
Motorcycle single sided swing arm rear spindle nuts
Ducati 999 - 998 - 996 - 916 - Monster - Multistrada - S2R - S4R 46mm + 41mm
Triumph preferably six sided socket 41mm
 
Mercedes Sensor Fixings
5 point Torx (male and female)
 
I truthfully never understand why manufacturers use odd size or style of bolts-fittings. The obvious answer is to try to prevent home mechanics enacting repairs, in truth it may be more to do with automated production tooling.

[french crap fanatic]

in the case of the saxo idle adjustment screw,its because its supposed to be factory set and not"adjustable"

i had a good one the other day,i was bleeding the front brakes on a 2008 grand voyager and the 10mm spanner was very loose,it slipped!!
so i got the 9mm spanner out,my laguna was that size,i thought maybe its that,was too small the spanner wouldnt fit over it!!!
i thought,it cant be,but it is a yank tank so i got my old 3/8 A/F snap on socket out,last used over 25 years ago on my austin maxi!!!
it fitted perfectly!!!

[Deleted]

Thanks remmington, handy reference

[Karl]

Just need two chisels 1 big 1 small

Gets most things off

[rhyds]

I'd say it's six of one and half a dozen of the other. A lot of screws are an odd size or odd type to discourage fiddling, especially the security torx screw type (torx but with a pin in the centre), where as others are clearly because they have to be wound up to a certain torque by line plant (head bolts etc.)

[Roverman]

First time I had to remove a Corsa D drivshaft  end nut I had to buy a new socket the nut is 35mm I tried a few tool factors and was told no one makes a 35mm socket had to make do with a 36 mm  do they make a special one for the main agents

[rhyds]

1250 Chevettes were apparently very confusing for all concerned. The body had been designed by Opel in Germany, so all those bolts and threads were Metric. The engine however was the old Viva unit, so all the German dealers had to buy A/F tools and all the UK dealers had to get Metric ones so they could work on them!

[wheelnut]

Mar 27, 2014 20:09:12 GMT 1 rhyds said:

1250 Chevettes were apparently very confusing for all concerned...

Never understood why they didn't leave the 1200cc Opel engine in it seeing as everything else was Opel. Also, the Opel engine was a better unit than the Vauxhall engine.

[oli]

With some of the Land Rover stuff, it's because they never bothered switch it from AF - 25mm for one inch and 52mm hub. Nuts that were 2 inch.

Quite what the rationale behind the twelve point sockets they use is, I don't know!

Oli

[natedog]

Mar 27, 2014 16:00:43 GMT 1 Roverman said:

First time I had to remove a Corsa D drivshaft  end nut I had to buy a new socket the nut is 35mm I tried a few tool factors and was told no one makes a 35mm socket had to make do with a 36 mm  do they make a special one for the main agents

Couldn't resist checking....

[Roverman]

Cheers Natedog so much for my local factors and I had even enquired at Cromwell Tools, never thought to look on the net, but it was wanted in a hurry anyway ordered one today
thanks again

[Rhubarb]

I had to buy a 35mm to fit a crankbolt years ago