TABLES

Updated March 2021

Machining

Drill sizes

Gauge	inches	millimeters
80	0.014	0.34
79	0.015	0.37
1/64	0.016	0.40
78	0.016	0.41
77	0.018	0.46
76	0.020	0.51
75	0.021	0.53
74	0.023	0.57
73	0.024	0.61
72	0.025	0.64
71	0.026	0.66
70	0.028	0.71
69	0.029	0.74
68	0.031	0.79
1/32	0.031	0.80
67	0.032	0.81
66	0.033	0.84
65	0.035	0.89
64	0.036	0.91
63	0.037	0.94
62	0.038	0.97
61	0.039	0.99
60	0.040	1.02
59	0.041	1.04
58	0.042	1.07
57	0.043	1.09
56	0.047	1.18
3/64	0.047	1.19
55	0.052	1.32
54	0.055	1.40
53	0.060	1.51
1/16	0.063	1.59
52	0.064	1.61
51	0.067	1.70
50	0.070	1.78
49	0.073	1.85
48	0.076	1.93
5/64	0.078	1.98
47	0.079	1.99
46	0.081	2.06
45	0.082	2.08
44	0.086	2.18
43	0.089	2.26
42	0.094	2.37
3/32	0.094	2.38
41	0.096	2.44
40	0.098	2.49
39	0.100	2.53
38	0.102	2.58
37	0.104	2.64
36	0.107	2.71
7/64	0.109	2.78
35	0.110	2.79
34	0.111	2.82
33	0.113	2.87
32	0.116	2.95
31	0.120	3.05
1/8	0.125	3.18
30	0.129	3.26
29	0.136	3.45
28	0.141	3.57
9/64	0.141	3.57
27	0.144	3.66
26	0.147	3.73
25	0.150	3.80
24	0.152	3.86
23	0.154	3.91
5/32	0.156	3.97
22	0.157	3.99
21	0.159	4.04
20	0.161	4.09
19	0.166	4.22
18	0.170	4.31
11/64	0.172	4.37
17	0.173	4.39
16	0.177	4.50
15	0.180	4.57
14	0.182	4.62
13	0.185	4.70
3/16	0.188	4.76
12	0.189	4.80
11	0.191	4.85
10	0.194	4.91
9	0.196	4.98
8	0.199	5.05
7	0.201	5.11
13/64	0.203	5.16
6	0.204	5.18
5	0.206	5.22
4	0.209	5.31
3	0.213	5.41
7/32	0.219	5.55
2	0.221	5.61
1	0.228	5.79
A	0.234	5.94
15/64	0.234	5.95
B	0.238	6.05
C	0.242	6.15
D	0.246	6.25
E	0.250	6.35
1/4	0.250	6.35
F	0.257	6.53
G	0.261	6.63
17/64	0.266	6.75
H	0.266	6.76
I	0.272	6.91
J	0.277	7.04
K	0.281	7.14
9/32	0.281	7.14
L	0.290	7.37
M	0.295	7.49
19/64	0.297	7.54
N	0.302	7.67
5/16	0.313	7.94
O	0.316	8.03
P	0.323	8.20
21/64	0.328	8.33
Q	0.332	8.43
R	0.339	8.61
11/32	0.344	8.73
S	0.348	8.84
T	0.358	9.09
23/64	0.359	9.13
U	0.368	9.35
3/8	0.375	9.53
V	0.377	9.58
W	0.386	9.80
25/64	0.391	9.92
X	0.397	10.08
Y	0.404	10.26
13/32	0.406	10.32
Z	0.413	10.49
27/64	0.422	10.72
7/16	0.438	11.11
29/64	0.453	11.51
15/32	0.469	11.90
31/64	0.484	12.30
1/2	0.500	12.70
33/64	0.516	13.10
17/32	0.531	13.49
35/64	0.547	13.89
9/16	0.563	14.29
37/64	0.578	14.68
19/32	0.594	15.08
39/64	0.609	15.48
5/8	0.625	15.88
41/64	0.641	16.27
21/32	0.656	16.67
43/64	0.672	17.07
11/16	0.688	17.46
45/64	0.703	17.86
23/32	0.719	18.25
47/64	0.734	18.65
3/4	0.750	19.05
49/64	0.766	19.45
25/32	0.781	19.84
51/64	0.797	20.24
13/16	0.813	20.64
53/64	0.828	21.03
27/32	0.844	21.43
55/64	0.859	21.83
7/8	0.875	22.23
57/64	0.891	22.62
29/32	0.906	23.02
59/64	0.922	23.42
15/16	0.938	23.81
61/64	0.953	24.21
31/32	0.969	24.60
63/64	0.984	25.00
1	1.000	25.40

Tap sizes

Tap size	Diameter (in)	Diameter (mm)	Thread count (TPI)	Thread pitch (mm)	Tap drill size
#0000-160	0.021	0.53	160	0.159	1/64 in
#000-120	0.034	0.86	120	0.212	#71
M1x0.2	0.039	1.00	~127	0.2	0.8 mm
M1x0.25	0.039	1.00	~102	0.25	0.75 mm
M1.1x0.25	0.043	1.10	~102	0.25	0.85 mm
M1.1x0.2	0.043	1.10	~127	0.2	0.9 mm
#00-90	0.047	1.19	90	0.282	#65
M1.2x0.2	0.047	1.20	~127	0.2	1 mm
M1.2x0.25	0.047	1.20	~102	0.25	0.95 mm
M1.4x0.2	0.055	1.40	~127	0.2	1.2 mm
M1.4x0.3	0.055	1.40	~85	0.3	1.1 mm
#0-80	0.060	1.52	80	0.318	3/64 in
M1.6x0.2	0.063	1.60	~127	0.2	1.4 mm
M1.6x0.35	0.063	1.60	~73	0.35	1.25 mm
M1.8x0.2	0.071	1.80	~127	0.2	1.6 mm
M1.8x0.35	0.071	1.80	~73	0.35	1.45 mm
#1-64	0.073	1.85	64	0.397	#52
#1-72	0.073	1.85	72	0.353	#53
M2x0.25	0.079	2.00	~102	0.25	1.75 mm
M2x0.4	0.079	2.00	~64	0.4	1.6 mm
#2-56	0.086	2.18	56	0.454	#50
#2-64	0.086	2.18	64	0.397	#50
M2.2x0.25	0.087	2.20	~102	0.25	1.95 mm
M2.2x0.45	0.087	2.20	~57	0.45	1.75 mm
M2.5x0.35	0.098	2.50	~73	0.35	2.1 mm
M2.5x0.45	0.098	2.50	~57	0.45	2.05 mm
#3-48	0.099	2.51	48	0.529	#47
#3-56	0.099	2.51	56	0.454	#45
#4-40	0.112	2.84	40	0.635	#43
#4-48	0.112	2.84	48	0.529	#42
M3x0.35	0.118	3.00	~73	0.35	2.6 mm
M3x0.5	0.118	3.00	~51	0.5	2.5 mm
#5-40	0.125	3.18	40	0.635	#39
#5-44	0.125	3.18	44	0.577	#37
M3.5x0.35	0.138	3.50	~73	0.35	3.1 mm
M3.5x0.6	0.138	3.50	~43	0.6	2.9 mm
#6-32	0.138	3.51	32	0.794	#36
#6-40	0.138	3.51	40	0.635	#33
M4x0.35	0.158	4.00	~73	0.35	3.6 mm
M4x0.5	0.158	4.00	~51	0.5	3.5 mm
M4x0.7	0.158	4.00	~37	0.7	3.3 mm
#8-32	0.164	4.17	32	0.794	#29
#8-36	0.164	4.17	36	0.706	#29
M4.5x0.5	0.177	4.50	~51	0.5	4 mm
M4.5x0.75	0.177	4.50	~34	0.75	3.8 mm
#10-32	0.190	4.83	32	0.794	#21
#10-24	0.190	4.83	24	1.058	#25
M5x0.5	0.197	5.00	~51	0.5	4.5 mm
M5x0.8	0.197	5.00	~32	0.8	4.2 mm
#12-24	0.216	5.49	24	1.058	#17
#12-28	0.216	5.49	28	0.907	#15
M5.5x0.5	0.217	5.50	~51	0.5	5 mm
M6x0.5	0.236	6.00	~51	0.5	5.5 mm
M6x0.75	0.236	6.00	~34	0.75	5.2 mm
M6x1	0.236	6.00	~26	1	5 mm
1/4-20	0.250	6.35	20	1.27	#7
1/4-28	0.250	6.35	28	0.907	#3
M7x0.75	0.276	7.00	~34	0.75	6.2 mm
M7x1	0.276	7.00	~26	1	6 mm
5/16-18	0.313	7.94	18	1.411	F
5/16-24	0.313	7.94	24	1.058	I
M8x0.5	0.315	8.00	~51	0.5	7.5 mm
M8x0.75	0.315	8.00	~34	0.75	7.2 mm
M8x1	0.315	8.00	~26	1	7 mm
M8x1.25	0.315	8.00	~21	1.25	6.8 mm
M9x0.75	0.354	9.00	~34	0.75	8.2 mm
M9x1	0.354	9.00	~26	1	8 mm
M9x1.25	0.354	9.00	~21	1.25	7.8 mm
3/8-24	0.375	9.53	24	1.058	Q
3/8-16	0.375	9.53	16	1.588	5/16 in
M10x0.75	0.394	10.00	~34	0.75	9.2 mm
M10x1.5	0.394	10.00	~17	1.5	8.5 mm
M10x1.25	0.394	10.00	~21	1.25	8.8 mm
M10x1	0.394	10.00	~26	1	9 mm
M11x0.75	0.433	11.00	~34	0.75	10.2 mm
M11x1	0.433	11.00	~26	1	10 mm
M11x1.5	0.433	11.00	~17	1.5	9.5 mm
7/16-14	0.438	11.11	14	1.814	U
7/16-20	0.438	11.11	20	1.27	25/64 in
M12x1.5	0.472	12.00	~17	1.5	10.5 mm
M12x1.75	0.472	12.00	~15	1.75	10.2 mm
M12x0.75	0.472	12.00	~34	0.75	11.25 mm
M12x1	0.472	12.00	~26	1	11 mm
M12x1.25	0.472	12.00	~21	1.25	10.8 mm
1/2-20	0.500	12.70	20	1.27	29/64 in
1/2-13	0.500	12.70	13	1.954	27/64 in
M14x1.5	0.551	14.00	~17	1.5	12.5 mm
M14x1.25	0.551	14.00	~21	1.25	12.8 mm
M14x1	0.551	14.00	~26	1	13 mm
M14x2	0.551	14.00	~13	2	12 mm
9/16-18	0.563	14.29	18	1.411	33/64 in
9/16-12	0.563	14.29	12	2.117	31/64 in
M15x1	0.591	15.00	~26	1	14 mm
M15x1.5	0.591	15.00	~17	1.5	13.5 mm
5/8-18	0.625	15.88	18	1.411	37/64 in
5/8-11	0.625	15.88	11	2.309	17/32 in
M16x2	0.630	16.00	~13	2	14 mm
M16x1.5	0.630	16.00	~17	1.5	14.5 mm
M16x1	0.630	16.00	~26	1	15 mm
M17x1	0.669	17.00	~26	1	16 mm
M17x1.5	0.669	17.00	~17	1.5	15.5 mm
M18x2.5	0.709	18.00	~11	2.5	15.5 mm
M18x1	0.709	18.00	~26	1	17 mm
M18x1.5	0.709	18.00	~17	1.5	16.5 mm
M18x2	0.709	18.00	~13	2	16 mm
3/4-16	0.750	19.05	16	1.588	11/16 in
3/4-10	0.750	19.05	10	2.54	21/32 in
M20x2	0.787	20.00	~13	2	18 mm
M20x1.5	0.787	20.00	~17	1.5	18.5 mm
M20x1	0.787	20.00	~26	1	19 mm
M20x2.5	0.787	20.00	~11	2.5	17.5 mm
M22x2	0.866	22.00	~13	2	20 mm
M22x1.5	0.866	22.00	~17	1.5	20.5 mm
M22x1	0.866	22.00	~26	1	21 mm
M22x2.5	0.866	22.00	~11	2.5	19.5 mm
7/8-9	0.875	22.23	9	2.822	49/64 in
7/8-14	0.875	22.23	14	1.814	13/16 in
M24x3	0.945	24.00	~9	3	21 mm
M24x1	0.945	24.00	~26	1	23 mm
M24x1.5	0.945	24.00	~17	1.5	22.5 mm
M24x2	0.945	24.00	~13	2	22 mm
M25x2	0.984	25.00	~13	2	23 mm
M25x1	0.984	25.00	~26	1	24 mm
M25x1.5	0.984	25.00	~17	1.5	23.5 mm
1/14	1.000	25.40	14	1.814	15/16 in
1-8	1.000	25.40	8	3.175	7/8 in
M26x1.5	1.024	26.00	~17	1.5	24.5 mm
M27x1.5	1.063	27.00	~17	1.5	25.5 mm
M27x3	1.063	27.00	~9	3	24 mm
M27x1	1.063	27.00	~26	1	26 mm
M27x2	1.063	27.00	~13	2	25 mm
M28x2	1.102	28.00	~13	2	26 mm
M28x1	1.102	28.00	~26	1	27 mm
M28x1.5	1.102	28.00	~17	1.5	26.5 mm
1 1/8-12	1.125	28.58	12	2.117	1 3/64 in
1 1/8-7	1.125	28.58	7	3.629	63/64 in
M30x1.5	1.181	30.00	~17	1.5	28.5 mm
M30x3.5	1.181	30.00	~8	3.5	26.5 mm
M30x2	1.181	30.00	~13	2	28 mm
1 1/4-12	1.250	31.75	12	2.117	1 11/64 in
1 1/4-7	1.250	31.75	7	3.629	1 7/64 in
M33x2	1.299	33.00	~13	2	31 mm
M33x3.5	1.299	33.00	~8	3.5	29.5 mm
M36x3	1.417	36.00	~9	3	33 mm
M36x4	1.417	36.00	~7	4	32 mm
1 1/2 -12	1.500	38.10	12	2.117	1 27/64 in
1 1/2-6	1.500	38.10	6	4.233	1 11/32 in
M39x4	1.535	39.00	~7	4	35 mm
M39x3	1.535	39.00	~9	3	36 mm
M42x4.5	1.654	42.00	~6	4.5	37.5 mm
1 3/4-12	1.750	44.45	12	2.117	1 43/64 in
1 3/4-5	1.750	44.45	5	5.08	1 35/64 in
M45x4.5	1.772	45.00	~6	4.5	40.5 mm
M48x5	1.890	48.00	~6	5	43 mm
2-12	2.000	50.80	12	2.117	1 59/64 in
2-4 1/2	2.000	50.80	4.5	5.644	1 25/32 in
M52x5	2.047	52.00	~6	5	47 mm
M56x5.5	2.205	56.00	~5	5.5	50.5 mm
M60x5.5	2.362	60.00	~5	5.5	54.5 mm
M64x6	2.520	64.00	~5	6	58 mm
M68x6	2.677	68.00	~5	6	62 mm

Materials

Coefficient of Thermal Expansion (CTE)

The table below has high-ish estimates for the CTE for various materials. I also added a column that shows the expected linear expansion (in μm per mm) over a 50°K (122°F) range, which roughly covers a device being left outside in the cold and in a warm car. This is just a starting point, of course the details of specific materials should be evaluated for any design.

Material	High estimate of CLTE (10^-6 K^-1)	μm/mm for 50°K delta
ABS (Acrylonitrile butadiene styrene) thermoplastic	108	5.4
ABS -glass fiber-reinforced	31	1.55
Acetal - glass fiber-reinforced	39	1.95
Acetals	110	5.5
Acrylic	75	3.75
Alumina (aluminium oxide, Al2O3)	8.1	0.405
Aluminum	24	1.2
Aluminum nitride	5.3	0.265
Amber	60	3
Antimonial lead (hard lead)	26.5	1.325
Antimony	11	0.55
Bakelite, bleached	22	1.1
Barium	20.6	1.03
Barium ferrite	10	0.5
Beryllium	12	0.6
Brass	19	0.95
Bronze	18	0.9
Cadmium	30	1.5
Calcium	22.3	1.115
Cast Iron Gray	10.8	0.54
Celluloid	100	5
Cellulose acetate (CA)	130	6.5
Cellulose acetate butynate (CAB)	171	8.55
Cellulose nitrate (CN)	120	6
Cement, Portland	11	0.55
Chlorinated polyether	80	4
Chlorinated polyvinylchloride (CPVC)	66	3.3
Chromium	7	0.35
Cobalt	12	0.6
Concrete	14	0.7
Concrete structure	9.8	0.49
Copper	16.7	0.835
Copper, Beryllium 25	17.8	0.89
Corundum, sintered	6.5	0.325
Diamond (Carbon)	1.3	0.065
Epoxy - glass fiber reinforced	36	1.8
Epoxy, cast resins & compounds, unfilled	65	3.25
Ethylene ethyl acrylate (EEA)	205	10.25
Ethylene vinyl acetate (EVA)	180	9
Fluoroethylene propylene (FEP)	135	6.75
Glass, hard	5.9	0.295
Glass, plate	9	0.45
Glass, Pyrex	4	0.2
Gold	14.2	0.71
Gold - copper	15.5	0.775
Gold - platinum	15.2	0.76
Granite	8.4	0.42
Graphite, pure (Carbon)	8	0.4
Gunmetal	18	0.9
Hard alloy K20	6	0.3
Hastelloy C	11.3	0.565
Ice, 0oC water	51	2.55
Inconel	12.6	0.63
Invar	1.5	0.075
Iron, cast	11	0.55
Iron, forged	11.3	0.565
Iron, pure	12	0.6
Kapton	20	1
Lead	29	1.45
Lithium	46	2.3
Magnesium	26.9	1.345
Magnesium alloy AZ31B	26	1.3
Manganese	22	1.1
Marble	14.1	0.705
Molybdenum	5	0.25
Monel metal	13.5	0.675
Neodymium	9.6	0.48
Nickel	13	0.65
Nylon, general purpose	90	4.5
Nylon, glass fiber reinforced	23	1.15
Nylon, Type 11, molding and extruding compound	100	5
Nylon, Type 12, molding and extruding compound	80.5	4.025
Nylon, Type 6, cast	85	4.25
Nylon, Type 6/6, molding compound	80	4
Palladium	11.8	0.59
Paraffin	480	24
Phenolic resin without fillers	80	4
Phosphor bronze	16.7	0.835
Plaster	17	0.85
Platinum	9	0.45
Polyacrylonitrile	70	3.5
Polyamide (PA)	110	5.5
Polybutylene (PB)	139	6.95
Polycarbonate (PC)	70	3.5
Polycarbonate - glass fiber-reinforced	21.5	1.075
Polyester	124	6.2
Polyester - glass fiber-reinforced	25	1.25
Polyethylene (PE)	200	10
Polyethylene (PE) - High Molecular Weight	108	5.4
Polyethylene terephthalate (PET)	59.4	2.97
Polyphenylene	54	2.7
Polyphenylene - glass fiber-reinforced	36	1.8
Polypropylene (PP), unfilled	90	4.5
Polypropylene - glass fiber-reinforced	32	1.6
Polystyrene (PS)	70	3.5
Polysulfone (PSO)	60	3
Polytetrafluorethylene (PTFE)	135	6.75
Polyurethane (PUR), rigid	57.6	2.88
Polyvinyl chloride (PVC)	110	5.5
Polyvinylidene fluoride (PVDF)	140	7
Porcelain, Industrial	4	0.2
Quartz, fused	0.55	0.0275
Quartz, mineral	14	0.7
Rhodium	8	0.4
Rubber, hard	80	4
Sapphire	5.3	0.265
Silicon	5	0.25
Silicon Carbide	2.77	0.1385
Silver	19.7	0.985
Slate	10	0.5
Sodium	70	3.5
Solder lead - tin, 50% - 50%	25	1.25
Steel	12.5	0.625
Steel Stainless Austenitic (304)	17.3	0.865
Steel Stainless Austenitic (310)	14.4	0.72
Steel Stainless Austenitic (316)	16	0.8
Steel Stainless Ferritic (410)	9.9	0.495
Tin	23	1.15
Titanium	9	0.45
Tungsten	4.5	0.225
Vanadium	8	0.4
Vinyl Ester	22	1.1
Wax	15	0.75
Zinc	35	1.75
Zirconium	5.7	0.285

References

custompart.net/tap-size-chart