Odd bolt-tool-bit sizes.

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Wheel nuts.

15mm    Hex    Smartcars    (15mm impact socket ground down with tape wrapped round as not to mark alloy wheels)

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    (allen key sawn & welded into a socket)

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 pentogon

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    (allen key sawn & welded into a socket)

 

Spline type sparkplug  

Super long spline socket    Citroen C5 fitted with Bosch 385R6 plugs     (Laser tools cheapest option, part number: 3949)

 

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 clutch

9mm female spline

 

Oil filters.

38mm    Six-sided    GM Vectra 2.0D

27mm    Six-sided-shallow    Mercedes A-Class (cheap socket ground down to make a shallow one)

24mm    Six-sided-shallow    BMW V8 engines 2004> (cheap socket ground down to make a shallow one)

 

Drain plug keys.

Triangular bit             Renault

10mm Female Sq    BMW, Ford, Renault, Toyota   (3/8" socket welded to a bar)

12mm Male Sq         Alfa, Fiat, Lancia

10mm Male Sq         Peugeot, Citroen , Renault, Volvo (3/8" short socket extension & filed down)

5mm Hex key            Mercedes

Spline M16 Tamperproof    VAG

 

VAG late doorhandles.

Spline M4

 

Fuel filter thru bolts.

13mm x 100mm    Hex key    Fiat, VAG    (allen key sawn & welded into 1/2" six sided impact socket)

 

Gearbox sump covers.

Ribe M8 x long    Alfa, Fiat, Lancia

 

Idle speed adjuster

Female E4 socket (tiny)   Citroen Saxo   (Draper sell 1/4" drive long one that fits down the hole)

 

Motorcycle wheel spindles.  (hard black bolts with 19-22-24mm heads, welded into 1/2" sockets).  Sealey sell a multipurpose tool for this purpose.

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      Preferably six sided socket, but 12point will do the job.  46mm +  41mm needed.

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.


Spanner Jaw Sizes and corresponding Nut/Bolt Use 
Diff
(mm)
Jaw Size
Millimetres
Jaw Size
Inches
Spanner
Metric
Spanner
AF
Spanner
British
Common Nut/Bolt
(*=non-preferred)
  2.97 0.117     10BA  
0.23 3.20 0.126 3.2mm     M1.6
0.13 3.33 0.131     9BA  
0.53 3.86 0.152     8BA  
0.11 3.97 0.156   5/32 AF   No.0 UNC
0.03 4.00 0.157 4mm     M2
0.37 4.37 0.172     7BA  
0.39 4.76 0.188   3/16 AF   No.2 UNC
0.14 4.90 0.193     6BA  
0.10 5.00 0.197 5mm     M2.5
0.50 5.50 0.217 5.5mm     M3
0.06 5.56 0.219   7/32 AF    
0.03 5.59 0.220     5BA  
0.37 5.95 0.234   15/64 AF    
0.05 6.00 0.236 6mm     M3.5*
0.30 6.30 0.248     4BA  
0.05 6.35 0.250   1/4 AF   No.4 UNC
0.65 7.00 0.276 7mm     M4
0.14 7.14 0.281   9/32 AF    
0.02 7.16 0.282     3BA  
0.77 7.94 0.313   5/16 AF   No.6 UNC & No.10 UNC (bolt)
0.06 8.00 0.315 8mm     M5
0.23 8.23 0.324     2BA  
0.36 8.59
0.338


1/8 W; 3/16 BSF
0.15
8.73 0.344   11/32 AF   No.8 UNC
0.27 9.00 0.354 9mm      
0.27 9.27 0.365     1BA  
0.25 9.53 0.375   3/8 AF   No.10 UNC (nut)
0.48 10.00 0.394 10mm     M6
0.49 10.49 0.413     0BA  
0.51 11.00 0.433 11mm     M7* 
0.11 11.11 0.438   7/16 AF   1/4 UNF
0.19 11.30 0.445     3/16 W; 1/4 BSF  
0.70 12.00 0.472 12mm      
0.70 12.70 0.500   1/2 AF   5/16 UNF
0.30 13.00 0.512 13mm     M8
0.33 13.34 0.525     1/4 W; 5/16 BSF  
0.67 14.00 0.551 14mm      
0.29 14.29 0.563   9/16 AF   3/8 UNF
0.71 15.00 0.591 15mm      
0.24 15.24 0.600     5/16 W; 3/8 BSF  
0.64 15.88 0.625   5/8 AF   7/16 UNF (bolt)
0.13 16.00 0.630 16mm      
1.00 17.00 0.669 17mm     M10
0.46 17.46 0.688   11/16 AF   7/16 UNF (nut) 
0.54 18.00 0.709 18mm      
0.03 18.03 0.710     3/8 W; 7/16 BSF  
0.97 19.00 0.748 19mm     M12
0.05 19.05 0.750   3/4 AF   1/2 UNF
0.95 20.00 0.787 20mm      
0.64 20.64 0.813   13/16 AF   9/16 UNF (bolt)
0.19 20.83 0.820     7/16 W; 1/2 BSF  
0.17 21.00 0.827 21mm      
1.00 22.00 0.866 22mm     M14*
0.22 22.23 0.875   7/8 AF   9/16 UNF (nut) 
0.78 23.00 0.906 23mm      
0.37 23.37 0.920     1/2 W; 9/16 BSF  
0.44 23.81 0.938   15/16 AF   5/8 UNF
0.19 24.00 0.945 24mm     M16
1.00 25.00 0.984 25mm      
0.40 25.40 1.000   1 AF    
0.25 25.65 1.010     9/16 W; 5/8 BSF  
0.35 26.00 1.024 26mm      
0.99 26.99 1.063   1-1/16 AF    
0.01 27.00 1.063 27mm     M18* 
0.94 27.94 1.100     5/8 W; 11/16 BSF  
0.06 28.00 1.102 28mm      
0.57 28.58 1.125   1-1/8 AF   3/4 UNF
1.43 30.00 1.181 30mm     M20
0.48 30.48 1.200     11/16 W; 3/4 BSF  
1.27 31.75 1.250   1-1/4 AF    
0.25 32.00 1.260 32mm     M22* 
1.02 33.02 1.300     3/4 W; 7/8 BSF  
0.32 33.34 1.313   1-5/16 AF   7/8 UNF
0.66 34.00
1.339 34mm



1.31 35.31 1.390     13/16 W?  
0.69 36.00 1.417 36mm     M24
0.51 36.51 1.438   1-7/16 AF    
1.08 37.59 1.480     7/8 W; 1 BSF  
0.41 38.00 1.496 38mm


0.10 38.10 1.500   1-1/2 AF   1 UNF
2.03
40.13 1.580

 15/16 W?
0.87 41.00 1.614 41mm     M27* 
0.27 41.28 1.625   1-5/8 AF    
1.14 42.42 1.670     1 W; 1-1/8 BSF  
0.44 42.86 1.688   1-11/16 AF   1-1/8 UNF
3.14 46.00 1.811 46mm     M30
0.04 46.04 1.813   1-13/16 AF    
1.21 47.24 1.860     1-1/8 W; 1-1/4 BSF  
0.38 47.63 1.875   1-7/8 AF   1-1/4 UNF
2.38 50.00 1.969 50mm     M33* 
0.80 50.80 2.000   2 AF    
1.27 52.07 2.050     1-1/4 W; 1-3/8 BSF  
0.32 52.39 2.063   2-1/16 AF   1-3/8 UNF
2.61 55.00 2.165 55mm     M36
0.56 55.56 2.188
2-3/16 AF

0.83
56.39
2.220


1-3/8 W; 1-1/2 BSF

0.76
57.15 2.250
2-1/4 AF
1-1/2 UNF
2.85
60.00 2.362 60mm     M39*

Page updated 27-06-17