ASME B18.6.3 Slotted Pan Head Machine Screws

Dimensions of ASME B18.6.3 Slotted Pan Head Machine Screws

Nominal Size or Basic Screw Diameter	Head Diameter, A		Head Height, H		Head Radius, R, Max	Slot Width, J		Slot Depth, T
Nominal Size or Basic Screw Diameter	Max	Min	Max	Min	Head Radius, R, Max	Max	Min	Max	Min
0000	0.042	0.036	0.016	0.010	0.007	0.008	0.004	0.008	0.004
000	0.066	0.060	0.023	0.017	0.010	0.012	0.008	0.012	0.008
00	0.090	0.082	0.032	0.025	0.015	0.017	0.010	0.016	0.010
0	0.116	0.104	0.039	0.031	0.020	0.023	0.016	0.022	0.014
1	0.142	0.130	0.046	0.038	0.025	0.026	0.019	0.027	0.018
2	0.167	0.155	0.053	0.045	0.035	0.031	0.023	0.031	0.022
3	0.193	0.180	0.060	0.051	0.037	0.035	0.027	0.036	0.026
4	0.219	0.205	0.068	0.058	0.042	0.039	0.031	0.040	0.030
5	0.245	0.231	0.075	0.065	0.044	0.043	0.035	0.045	0.034
6	0.270	0.256	0.082	0.072	0.046	0.048	0.039	0.050	0.037
8	0.322	0.306	0.096	0.085	0.052	0.054	0.045	0.058	0.045
10	0.373	0.357	0.110	0.099	0.061	0.060	0.050	0.068	0.053
12	0.425	0.407	0.125	0.112	0.078	0.067	0.056	0.077	0.061
1/4	0.492	0.473	0.144	0.130	0.087	0.075	0.064	0.087	0.070
5/16	0.615	0.594	0.178	0.162	0.099	0.084	0.072	0.106	0.085
3/8	0.740	0.716	0.212	0.195	0.143	0.094	0.081	0.124	0.100
7/16	0.863	0.837	0.247	0.228	0.153	0.094	0.081	0.142	0.116
1/2	0.987	0.958	0.281	0.260	0.175	0.106	0.091	0.161	0.131
9/16	1.041	1.000	0.315	0.293	0.197	0.118	0.102	0.179	0.146
5/8	1.172	1.125	0.350	0.325	0.219	0.133	0.116	0.197	0.162
3/4	1.435	1.375	0.419	0.390	0.263	0.149	0.131	0.234	0.192

Notes :

Short screws include nominal lengths up to and including 1 1/8 in.
Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.
Tabulated values determined from formula for maximum H in Appendix A.
Tabulated values determined from formula for maximum O in Appendix A.
Point same on all drivers.
No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protusion values must be recalculated using the formulas.