Scale Modelling Drill and Wire Chart
ACTUAL					SCALE EQUIVALENT
DRILL	AWG	FRAC	DEC	MM	Z	N	HO	S	O	G
		1	1.0000	25.400	220.000	160.000	87.100	64.000	48.000	22.500
		31/32	0.9688	24.608	213.136	155.008	84.382	62.003	46.502	21.798
		15/16	0.9375	23.813	206.250	150.000	81.656	60.000	45.000	21.094
		29/32	0.9063	23.020	199.386	145.008	78.939	58.003	43.502	20.392
		7/8	0.8750	22.225	192.500	140.000	76.213	56.000	42.000	19.688
		27/32	0.8438	21.433	185.636	135.008	73.495	54.003	40.502	18.986
		13/16	0.8125	20.638	178.750	130.000	70.769	52.000	39.000	18.281
		25/32	0.7813	19.845	171.886	125.008	68.051	50.003	37.502	17.579
		3/4	0.7500	19.050	165.000	120.000	65.325	48.000	36.000	16.875
		23/32	0.7188	18.258	158.136	115.008	62.607	46.003	34.502	16.173
		11/16	0.6875	17.463	151.250	110.000	59.881	44.000	33.000	15.469
		21/32	0.6563	16.670	144.386	105.008	57.164	42.003	31.502	14.767
		21/32	0.6563	16.670	144.386	105.008	57.164	42.003	31.502	14.767
		5/8	0.6250	15.875	137.500	100.000	54.438	40.000	30.000	14.063
		19/32	0.5938	15.083	130.636	95.008	51.720	38.003	28.502	13.361
		9/16	0.5625	14.288	123.750	90.000	48.994	36.000	27.000	12.656
		17/32	0.5313	13.495	116.886	85.008	46.276	34.003	25.502	11.954
		1/2	0.5000	12.700	110.000	80.000	43.550	32.000	24.000	11.250
		31/64	0.4844	12.304	106.568	77.504	42.191	31.002	23.251	10.899
		15/32	0.4688	11.908	103.136	75.008	40.832	30.003	22.502	10.548
	4/0		0.4600	11.684	101.200	73.600	40.066	29.440	22.080	10.350
		29/64	0.4531	11.509	99.682	72.496	39.465	28.998	21.749	10.195
		7/16	0.4375	11.113	96.250	70.000	38.106	28.000	21.000	9.844
		27/64	0.4219	10.716	92.818	67.504	36.747	27.002	20.251	9.493
	3/0		0.4096	10.404	90.112	65.536	35.676	26.214	19.661	9.216
		13/32	0.4063	10.320	89.386	65.008	35.389	26.003	19.502	9.142
Y			0.4040	10.262	88.880	64.640	35.188	25.856	19.392	9.090
X			0.3970	10.084	87.340	63.520	34.579	25.408	19.056	8.933
		25/64	0.3906	9.921	85.932	62.496	34.021	24.998	18.749	8.789
W			0.3860	9.804	84.920	61.760	33.621	24.704	18.528	8.685
V			0.3770	9.576	82.940	60.320	32.837	24.128	18.096	8.483
		3/8	0.3750	9.525	82.500	60.000	32.663	24.000	18.000	8.438
U			0.3680	9.347	80.960	58.880	32.053	23.552	17.664	8.280
	2/0		0.3648	9.266	80.256	58.368	31.774	23.347	17.510	8.208
		23/64	0.3594	9.129	79.068	57.504	31.304	23.002	17.251	8.087
T			0.3580	9.093	78.760	57.280	31.182	22.912	17.184	8.055
S			0.3480	8.839	76.560	55.680	30.311	22.272	16.704	7.830
		11/32	0.3438	8.733	75.636	55.008	29.945	22.003	16.502	7.736
R			0.3390	8.611	74.580	54.240	29.527	21.696	16.272	7.628
Q			0.3320	8.433	73.040	53.120	28.917	21.248	15.936	7.470
		21/64	0.3281	8.334	72.182	52.496	28.578	20.998	15.749	7.382
	1/0		0.3249	8.252	71.478	51.984	28.299	20.794	15.595	7.310
P			0.3230	8.204	71.060	51.680	28.133	20.672	15.504	7.268
O			0.3160	8.026	69.520	50.560	27.524	20.224	15.168	7.110
		5/16	0.3125	7.938	68.750	50.000	27.219	20.000	15.000	7.031
N			0.3020	7.671	66.440	48.320	26.304	19.328	14.496	6.795
		19/64	0.2969	7.541	65.318	47.504	25.860	19.002	14.251	6.680
M			0.2950	7.493	64.900	47.200	25.695	18.880	14.160	6.638
L			0.2900	7.366	63.800	46.400	25.259	18.560	13.920	6.525
	1		0.2893	7.348	63.646	46.288	25.198	18.515	13.886	6.509
		9/32	0.2813	7.145	61.886	45.008	24.501	18.003	13.502	6.329
K			0.2810	7.137	61.820	44.960	24.475	17.984	13.488	6.323
J			0.2770	7.036	60.940	44.320	24.127	17.728	13.296	6.233
I			0.2720	6.909	59.840	43.520	23.691	17.408	13.056	6.120
H			0.2660	6.756	58.520	42.560	23.169	17.024	12.768	5.985
		17/64	0.2656	6.746	58.432	42.496	23.134	16.998	12.749	5.976
G			0.2610	6.629	57.420	41.760	22.733	16.704	12.528	5.873
	2		0.2576	6.543	56.672	41.216	22.437	16.486	12.365	5.796
F			0.2570	6.528	56.540	41.120	22.385	16.448	12.336	5.783
E		1/4	0.2500	6.350	55.000	40.000	21.775	16.000	12.000	5.625
D			0.2460	6.248	54.120	39.360	21.427	15.744	11.808	5.535
C			0.2420	6.147	53.240	38.720	21.078	15.488	11.616	5.445
B			0.2380	6.045	52.360	38.080	20.730	15.232	11.424	5.355
		15/64	0.2344	5.954	51.568	37.504	20.416	15.002	11.251	5.274
A			0.2340	5.944	51.480	37.440	20.381	14.976	11.232	5.265
	3		0.2294	5.827	50.468	36.704	19.981	14.682	11.011	5.162
1			0.2280	5.791	50.160	36.480	19.859	14.592	10.944	5.130
2			0.2210	5.613	48.620	35.360	19.249	14.144	10.608	4.973
		7/32	0.2188	5.558	48.136	35.008	19.057	14.003	10.502	4.923
3			0.2130	5.410	46.860	34.080	18.552	13.632	10.224	4.793
4			0.2090	5.309	45.980	33.440	18.204	13.376	10.032	4.703
5			0.2055	5.220	45.210	32.880	17.899	13.152	9.864	4.624
	4		0.2043	5.189	44.946	32.688	17.795	13.075	9.806	4.597
6			0.2040	5.182	44.880	32.640	17.768	13.056	9.792	4.590
		13/64	0.2031	5.159	44.682	32.496	17.690	12.998	9.749	4.570
7			0.2010	5.105	44.220	32.160	17.507	12.864	9.648	4.523
8			0.1990	5.055	43.780	31.840	17.333	12.736	9.552	4.478
9			0.1960	4.978	43.120	31.360	17.072	12.544	9.408	4.410
10			0.1935	4.915	42.570	30.960	16.854	12.384	9.288	4.354
11			0.1910	4.851	42.020	30.560	16.636	12.224	9.168	4.298
12			0.1890	4.801	41.580	30.240	16.462	12.096	9.072	4.253
		3/16	0.1875	4.763	41.250	30.000	16.331	12.000	9.000	4.219
13			0.1850	4.699	40.700	29.600	16.114	11.840	8.880	4.163
14			0.1820	4.623	40.040	29.120	15.852	11.648	8.736	4.095
	5		0.1819	4.620	40.018	29.104	15.843	11.642	8.731	4.093
15			0.1800	4.572	39.600	28.800	15.678	11.520	8.640	4.050
16			0.1770	4.496	38.940	28.320	15.417	11.328	8.496	3.983
17			0.1730	4.394	38.060	27.680	15.068	11.072	8.304	3.893
		11/64	0.1719	4.366	37.818	27.504	14.972	11.002	8.251	3.868
18			0.1695	4.305	37.290	27.120	14.763	10.848	8.136	3.814
19			0.1660	4.216	36.520	26.560	14.459	10.624	7.968	3.735
	6		0.1620	4.115	35.640	25.920	14.110	10.368	7.776	3.645
20			0.1610	4.089	35.420	25.760	14.023	10.304	7.728	3.623
21			0.1590	4.039	34.980	25.440	13.849	10.176	7.632	3.578
22			0.1570	3.988	34.540	25.120	13.675	10.048	7.536	3.533
		5/32	0.1563	3.970	34.386	25.008	13.614	10.003	7.502	3.517
23			0.1540	3.912	33.880	24.640	13.413	9.856	7.392	3.465
24			0.1520	3.861	33.440	24.320	13.239	9.728	7.296	3.420
25			0.1495	3.797	32.890	23.920	13.021	9.568	7.176	3.364
26			0.1470	3.734	32.340	23.520	12.804	9.408	7.056	3.308
	7		0.1443	3.665	31.746	23.088	12.569	9.235	6.926	3.247
27			0.1440	3.658	31.680	23.040	12.542	9.216	6.912	3.240
		9/64	0.1406	3.571	30.932	22.496	12.246	8.998	6.749	3.164
28			0.1405	3.569	30.910	22.480	12.238	8.992	6.744	3.161
29			0.1360	3.454	29.920	21.760	11.846	8.704	6.528	3.060
30	8		0.1285	3.264	28.270	20.560	11.192	8.224	6.168	2.891
		1/8	0.1250	3.175	27.500	20.000	10.888	8.000	6.000	2.813
31			0.1200	3.048	26.400	19.200	10.452	7.680	5.760	2.700
32			0.1160	2.946	25.520	18.560	10.104	7.424	5.568	2.610
	9		0.1144	2.906	25.168	18.304	9.964	7.322	5.491	2.574
33			0.1130	2.870	24.860	18.080	9.842	7.232	5.424	2.543
34			0.1110	2.819	24.420	17.760	9.668	7.104	5.328	2.498
35			0.1100	2.794	24.200	17.600	9.581	7.040	5.280	2.475
		7/64	0.1094	2.779	24.068	17.504	9.529	7.002	5.251	2.462
36			0.1065	2.705	23.430	17.040	9.276	6.816	5.112	2.396
37			0.1040	2.642	22.880	16.640	9.058	6.656	4.992	2.340
	10		0.1019	2.588	22.418	16.304	8.875	6.522	4.891	2.293
38			0.1015	2.578	22.330	16.240	8.841	6.496	4.872	2.284
39			0.0995	2.527	21.890	15.920	8.666	6.368	4.776	2.239
40			0.0980	2.489	21.560	15.680	8.536	6.272	4.704	2.205
41			0.0960	2.438	21.120	15.360	8.362	6.144	4.608	2.160
		3/32	0.0938	2.383	20.636	15.008	8.170	6.003	4.502	2.111
42			0.0935	2.375	20.570	14.960	8.144	5.984	4.488	2.104
43			0.0890	2.261	19.580	14.240	7.752	5.696	4.272	2.003
44			0.0860	2.184	18.920	13.760	7.491	5.504	4.128	1.935
45			0.0820	2.083	18.040	13.120	7.142	5.248	3.936	1.845
46			0.0810	2.057	17.820	12.960	7.055	5.184	3.888	1.823
	12		0.0808	2.052	17.776	12.928	7.038	5.171	3.878	1.818
47			0.0785	1.994	17.270	12.560	6.837	5.024	3.768	1.766
		5/64	0.0781	1.984	17.182	12.496	6.803	4.998	3.749	1.757
48			0.0760	1.930	16.720	12.160	6.620	4.864	3.648	1.710
49			0.0730	1.854	16.060	11.680	6.358	4.672	3.504	1.643
	13		0.0720	1.829	15.840	11.520	6.271	4.608	3.456	1.620
50			0.0700	1.778	15.400	11.200	6.097	4.480	3.360	1.575
51			0.0670	1.702	14.740	10.720	5.836	4.288	3.216	1.508
	14		0.0641	1.628	14.102	10.256	5.583	4.102	3.077	1.442
52			0.0635	1.613	13.970	10.160	5.531	4.064	3.048	1.429
		1/16	0.0625	1.588	13.750	10.000	5.444	4.000	3.000	1.406
53			0.0595	1.511	13.090	9.520	5.182	3.808	2.856	1.339
	15		0.0571	1.450	12.562	9.136	4.973	3.654	2.741	1.285
54			0.0550	1.397	12.100	8.800	4.791	3.520	2.640	1.238
55			0.0520	1.321	11.440	8.320	4.529	3.328	2.496	1.170
	16		0.0508	1.290	11.176	8.128	4.425	3.251	2.438	1.143
		3/64	0.0469	1.191	10.318	7.504	4.085	3.002	2.251	1.055
56			0.0465	1.181	10.230	7.440	4.050	2.976	2.232	1.046
	17		0.0453	1.151	9.966	7.248	3.946	2.899	2.174	1.019
57			0.0430	1.092	9.460	6.880	3.745	2.752	2.064	0.968
58			0.0420	1.067	9.240	6.720	3.658	2.688	2.016	0.945
59			0.0410	1.041	9.020	6.560	3.571	2.624	1.968	0.923
	18		0.0403	1.024	8.866	6.448	3.510	2.579	1.934	0.907
60			0.0400	1.016	8.800	6.400	3.484	2.560	1.920	0.900
61			0.0390	0.991	8.580	6.240	3.397	2.496	1.872	0.878
62			0.0380	0.965	8.360	6.080	3.310	2.432	1.824	0.855
63			0.0370	0.940	8.140	5.920	3.223	2.368	1.776	0.833
64			0.0360	0.914	7.920	5.760	3.136	2.304	1.728	0.810
	19		0.0359	0.912	7.898	5.744	3.127	2.298	1.723	0.808
65			0.0350	0.889	7.700	5.600	3.049	2.240	1.680	0.788
66			0.0330	0.838	7.260	5.280	2.874	2.112	1.584	0.743
	20		0.0320	0.813	7.040	5.120	2.787	2.048	1.536	0.720
67			0.0320	0.813	7.040	5.120	2.787	2.048	1.536	0.720
		1/32	0.0313	0.795	6.886	5.008	2.726	2.003	1.502	0.704
68			0.0310	0.787	6.820	4.960	2.700	1.984	1.488	0.698
69			0.0292	0.742	6.424	4.672	2.543	1.869	1.402	0.657
	21		0.0285	0.724	6.270	4.560	2.482	1.824	1.368	0.641
70			0.0280	0.711	6.160	4.480	2.439	1.792	1.344	0.630
71			0.0260	0.660	5.720	4.160	2.265	1.664	1.248	0.585
	22		0.0253	0.643	5.566	4.048	2.204	1.619	1.214	0.569
72			0.0250	0.635	5.500	4.000	2.178	1.600	1.200	0.563
73			0.0240	0.610	5.280	3.840	2.090	1.536	1.152	0.540
	23		0.0226	0.574	4.972	3.616	1.968	1.446	1.085	0.509
74			0.0225	0.572	4.950	3.600	1.960	1.440	1.080	0.506
75			0.0210	0.533	4.620	3.360	1.829	1.344	1.008	0.473
	24		0.0201	0.511	4.422	3.216	1.751	1.286	0.965	0.452
76			0.0200	0.508	4.400	3.200	1.742	1.280	0.960	0.450
77			0.0180	0.457	3.960	2.880	1.568	1.152	0.864	0.405
	25		0.0179	0.455	3.938	2.864	1.559	1.146	0.859	0.403
78			0.0160	0.406	3.520	2.560	1.394	1.024	0.768	0.360
	26		0.0159	0.404	3.498	2.544	1.385	1.018	0.763	0.358
		1/64	0.0156	0.396	3.432	2.496	1.359	0.998	0.749	0.351
79			0.0145	0.368	3.190	2.320	1.263	0.928	0.696	0.326
	27		0.0142	0.361	3.124	2.272	1.237	0.909	0.682	0.320
80			0.0135	0.343	2.970	2.160	1.176	0.864	0.648	0.304
	28		0.0126	0.320	2.772	2.016	1.097	0.806	0.605	0.284
	29		0.0113	0.287	2.486	1.808	0.984	0.723	0.542	0.254
	30		0.0100	0.254	2.200	1.600	0.871	0.640	0.480	0.225
	31		0.0089	0.226	1.958	1.424	0.775	0.570	0.427	0.200
	32		0.0080	0.203	1.760	1.280	0.697	0.512	0.384	0.180
	33		0.0071	0.180	1.562	1.136	0.618	0.454	0.341	0.160
	34		0.0063	0.160	1.386	1.008	0.549	0.403	0.302	0.142
	35		0.0056	0.142	1.232	0.896	0.488	0.358	0.269	0.126
	36		0.0050	0.127	1.100	0.800	0.436	0.320	0.240	0.113
	37		0.0045	0.114	0.990	0.720	0.392	0.288	0.216	0.101
	38		0.0040	0.102	0.880	0.640	0.348	0.256	0.192	0.090
	39		0.0035	0.089	0.770	0.560	0.305	0.224	0.168	0.079
	40		0.0031	0.079	0.682	0.496	0.270	0.198	0.149	0.070
	41		0.0028	0.071	0.616	0.448	0.244	0.179	0.134	0.063
	42		0.0025	0.064	0.550	0.400	0.218	0.160	0.120	0.056
	43		0.0022	0.056	0.484	0.352	0.192	0.141	0.106	0.050
	44		0.0020	0.051	0.440	0.320	0.174	0.128	0.096	0.045

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Last Updated on 7/7/2007
By Samuel J. Cook