Screw Holez
0-80 Hardware Flat Head Diameter 0.119 - Pan Head Diameter 0.116 - Socket Head Diameter 0.098 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.119 OD 0.062 ID Flat Washer 0.188 OD 0.073 Hole Nut Clearance 0.180 - Clearance Hole 0.064 (#52 Drill) - Tap Hole 0.046 (3/64 Drill) -	2-56 Hardware Flat Head Diameter 0.172 - Pan Head Diameter 0.167 - Socket Head Diameter 0.140 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.2 OD 0.089 ID Flat Washer 0.172 OD 0.088 ID Nut Clearance 0.217 - Clearance Hole 0.089 (#43 Drill) - Tap Hole 0.07 (#50 Drill) -
4-40 Hardware Flat Head Diameter 0.225 - Pan Head Diameter 0.219 - Socket Head Diameter 0.185 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.27 OD 0.115 ID Flat Washer 0.209 OD 0.115 ID Nut Clearance 0.289 - Clearance Hole 0.116 (#32 Drill) - Tap Hole 0.089 (#43 Drill) -	6-32 Hardware Flat Head Diameter 0.279 - Pan Head Diameter 0.270 - Socket Head Diameter 0.266 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.295 OD 0.141 ID Flat Washer 0.25 OD 0.141 ID Nut Clearance 0.361 - Clearance Hole 0.144 (#27 Drill) - Tap Hole 0.106 (#36 Drill) -
8-32 Hardware Flat Head Diameter 0.332 - Pan Head Diameter 0.332 - Socket Head Diameter 0.270 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.34 OD 0.168 ID Flat Washer 0.293 OD 0.168 ID Nut Clearance 0.397 - Clearance Hole 0.17 (#18 Drill) - Tap Hole 0.136 (#29 Drill) -	10-32 Hardware Flat Head Diameter 0.385 - Pan Head Diameter 0.373 - Socket Head Diameter 0.313 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.381 OD 0.195 ID Flat Washer 0.334 OD 0.194 ID Nut Clearance 0.433 - Clearance Hole 0.196 (#9 Drill) - Tap Hole 0.159 (#21 Drill) -
1/4-20 Hardware Flat Head Diameter 0.507 - Pan Head Diameter 0.492 - Socket Head Diameter 0.375 - External Lock Washer N/A N/A Internal Lock Washer N/A N/A Split Lock Washer 0.478 OD 0.256 ID Flat Washer 0.489 OD 0.255 ID Nut Clearance 0.508 - Clearance Hole 0.257 (#F Drill) - Tap Hole 0.213 (#3 Drill) -

Wire Holez
Gauge (AWA)	Diameter (Inch)	Finished Hole Diameter (Inch)
36	0.005	0.016 - 0.03
35	0.0056	0.016 - 0.03
34	0.006	0.016 - 0.03
33	0.007	0.016 - 0.03
32	0.008	0.016 - 0.03
31	0.009	0.016 - 0.03
30	0.01	0.017 - 0.031
29	0.011	0.018 - 0.032
28	0.013	0.02 - 0.034
27	0.014	0.021 - 0.035
26	0.016	0.023 - 0.037
25	0.018	0.025 - 0.039
24	0.02	0.027 - 0.041
23	0.023	0.03 - 0.044
22	0.025	0.032 - 0.046
21	0.028	0.035 - 0.049
20	0.032	0.039 - 0.053
19	0.036	0.043 - 0.057
18	0.04	0.047 - 0.061
17	0.045	0.052 - 0.066
16	0.05	0.057 - 0.072
15	0.057	0.064 - 0.078
14	0.064	0.071 - 0.085
13	0.072	0.078 - 0.092
12	0.081	0.088 - 0.102
11	0.09	0.097 - 0.111
10	0.102	0.109 - 0.123
9	0.114	0.121 - 0.135
8	0.128	0.135 - 0.149
7	0.144	0.151 - 0.165
6	0.162	0.169 - 0.183
5	0.182	0.189 - 0.203
4	0.204	0.211 - 0.225
3	0.229	0.236 - 0.25
2	0.258	0.265 - 0.279
1	0.289	0.296 - 0.31
0	0.325	0.332 - 0.346