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Timber built platelayers hut in 4mm ft OO scale
Timber built platelayers hut in 4mm ft OO scale

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A small card kit of a GWR lineside platelayers hut card kit in 4mm ft OO s...

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We hope that this drill size conversion chart will be of use to some modellers.  Should you spot an error in the figures, please let us know.

 

Fract.
(in)
Decimal Wire No.
/Letter
Metric
(mm)
Fract.
(in)
Decimal Wire No.
/Letter
Metric
(mm)
Fract
(in)
Decimal Wire No.
/Letter
Metric
(mm)
 0.0098  0.25  0.106536   0.3480S 
 0.0118  0.30 7/640.1094    0.3543  9.00
 0.013580   0.110035   0.3580T 
 0.0138  0.35  0.1102  2.80 23/640.3594  
 0.014579   0.111034   0.3680U 
1/640.0156    0.113033   0.3740  9.50
 0.0157  0.40  0.1142  2.90 3/80.3750  
 0.016078   0.116032   0.3770V 
 0.0177  0.45  0.1181  3.00  0.3860W 
 0.018077   0.120031  25/640.3906  
 0.0197  0.50 1/80.1250    0.3937  10.00
 0.020076   0.128530   0.3970X 
 0.021075   0.136029   0.4040Y 
 0.0217  0.55  0.1378  3.50 13/320.4063  
 0.022574   0.140528   0.4130Z 
 0.0236  0.60 9/640.1406    0.4134  10.50
 0.024073   0.144027  27/640.4219  
 0.025072   0.147026   0.4331  11.00
 0.0256  0.65  0.149525  7/160.4375  
 0.026071   0.152024   0.4528  11.50
 0.0276  0.70  0.154023  29/640.4531  
 0.028070  5/320.1563   15/320.4688  
 0.029269   0.157022   0.4724  12.00
 0.0295  0.75  0.1575  4.00 31/640.4844  
 0.031068   0.159021   0.4921  12.50
1/320.0313    0.161020  1/20.5000  
 0.0315  0.80  0.166019   0.5118  13.00
 0.032067   0.169518  33/640.5156  
 0.033066  11/640.1719   17/320.5313  
 0.0335  0.85  0.173017   0.5315  13.50
 0.035065   0.177016  35/640.5469  
 0.0354  0.90  0.1772  4.50  0.5512  14.00
 0.036064   0.180015  9/160.5625  
 0.037063   0.182014   0.5709  14.50
 0.0374  0.95  0.185013  37/640.5781  
 0.038062  3/160.1875    0.5905  15.00
 0.039061   0.189012  19/320.5938  
 0.0394  1.00  0.191011  39/640.6094  
 0.040060   0.193510   0.6102  15.50
 0.041059   0.19609  5/80.6250  
 0.042058   0.1968  5.00  0.6299  16.00
 0.043057   0.19908  41/640.6406  
 0.0433  1.10  0.20107   0.6496  16.50
 0.046556  13/640.2031   21/320.6563  
3/640.0469    0.20406   0.6693  17.00
 0.0472  1.20  0.20555  43/640.6719  
 0.0512  1.30  0.20904  11/160.6875  
 0.052055   0.21303   0.6890  17.50
 0.055054   0.2165  5.50 45/640.7031  
 0.0551  1.40 7/320.2188    0.7087  18.00
 0.0591  1.50  0.22102  23/320.7188  
 0.059553   0.22801   0.7283  18.50
1/160.0625    0.2340A  47/640.7344  
 0.0630  1.60 15/640.2344    0.7480  19.00
 0.063552   0.2362  6.00 3/40.7500  
 0.0669  1.70  0.2380B  49/640.7656  
 0.067051   0.2420C   0.7677  19.50
 0.070050   0.2460D  25/320.7813  
 0.0709  1.80 1/40.2500 E   0.7874  20.00
 0.073049   0.2559  6.50 51/640.7969  
 0.0748  1.90  0.2570F   0.8071  20.50
 0.076048   0.2610G  13/160.8125  
5/640.0781   17/640.2656    0.8268  21.00
 0.078547   0.2660H  53/640.8281  
 0.0787  2.00  0.2720I  27/320.8438  
 0.081046   0.2756  7.00  0.8465  21.50
 0.082045   0.2770J  55/640.8594  
 0.0827  2.10  0.2810K   0.8661  22.00
 0.086044  9/320.2813   7/80.8750  
 0.0866  2.20  0.2900L   0.8858  22.50
 0.089043   0.2950M  57/640.8906  
 0.0906  2.30  0.2953  7.50  0.9055  23.00
 0.093542  19/640.2969   29/320.9063  
3/320.0938    0.3020N  59/640.9219  
 0.0945  2.40 5/160.3125    0.9252  23.50
 0.096041   0.3150  8.00 15/160.9375  
 0.098040   0.3160O   0.9449  24.00
 0.0984  2.50  0.3230P  61/640.9531  
 0.099539  21/640.3281    0.9646  24.50
 0.101538   0.3320Q  31/320.9688  
 0.1024  2.60  0.3346  8.50  0.9842  25.00
 0.104037   0.3390R  63/640.9844  
 0.1063  2.70 11/320.3438   11.0000  
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