Shop charts

Hub W&B Convert Hardware Charts Safety wire Torque Test prep ADs Calibration

Drill decimals, tap drills, rivet marks, wire gauge, and fraction conversions. Search from the bench.

Drill	Decimal in	mm
#1	0.228	5.79
#2	0.221	5.61
#3	0.213	5.41
#4	0.209	5.31
#5	0.2055	5.22
#6	0.204	5.18
#7	0.201	5.11
#8	0.199	5.05
#9	0.196	4.98
#10	0.1935	4.91
#11	0.191	4.85
#12	0.189	4.80
#13	0.185	4.70
#14	0.182	4.62
#15	0.18	4.57
#16	0.177	4.50
#17	0.173	4.39
#18	0.1695	4.31
#19	0.166	4.22
#20	0.161	4.09
#21	0.159	4.04
#22	0.157	3.99
#23	0.154	3.91
#24	0.152	3.86
#25	0.1495	3.80
#26	0.147	3.73
#27	0.144	3.66
#28	0.1405	3.57
#29	0.136	3.45
#30	0.1285	3.26
#31	0.12	3.05
#32	0.116	2.95
#33	0.113	2.87
#34	0.111	2.82
#35	0.11	2.79
#36	0.1065	2.71
#37	0.104	2.64
#38	0.1015	2.58
#39	0.0995	2.53
#40	0.098	2.49
#41	0.096	2.44
#42	0.0935	2.37
#43	0.089	2.26
#44	0.086	2.18
#45	0.082	2.08
#46	0.081	2.06
#47	0.0785	1.99
#48	0.076	1.93
#49	0.073	1.85
#50	0.07	1.78
#51	0.067	1.70
#52	0.0635	1.61
#53	0.0595	1.51
#54	0.055	1.40
#55	0.052	1.32
#56	0.0465	1.18
#57	0.043	1.09
#58	0.042	1.07
#59	0.041	1.04
#60	0.04	1.02
#61	0.039	0.99
#62	0.038	0.97
#63	0.037	0.94
#64	0.036	0.91
#65	0.035	0.89
#66	0.033	0.84
#67	0.032	0.81
#68	0.031	0.79
#69	0.0292	0.74
#70	0.028	0.71
#71	0.026	0.66
#72	0.025	0.64
#73	0.024	0.61
#74	0.0225	0.57
#75	0.021	0.53
#76	0.02	0.51
#77	0.018	0.46
#78	0.016	0.41
#79	0.0145	0.37
#80	0.0135	0.34
A	0.234	5.94
B	0.238	6.05
C	0.242	6.15
D	0.246	6.25
E	0.25	6.35
F	0.257	6.53
G	0.261	6.63
H	0.266	6.76
I	0.272	6.91
J	0.277	7.04
K	0.281	7.14
L	0.29	7.37
M	0.295	7.49
N	0.302	7.67
O	0.316	8.03
P	0.323	8.20
Q	0.332	8.43
R	0.339	8.61
S	0.348	8.84
T	0.358	9.09
U	0.368	9.35
V	0.377	9.58
W	0.386	9.80
X	0.397	10.08
Y	0.404	10.26
Z	0.413	10.49

Shop charts, not approved data. Drill decimals are the common number and letter series. Tap drills are the usual 75 percent thread sizes. Rivet edge distance and pitch follow AC 43.13-1B practice. The aircraft manual still wins.