Flat Head for Machine Screws                              ANSI/ASME B18.6.3 1972
Nominal Size	Head Dimensions			Slot Dimensions				Recess Dimensions			Protrusion Above Gaging Dia.(P)		Gaging Dia.(G)	Driver Size
	Diameter(W)		Height(H)	Width(S)		Depth(D)		Dia.(B)	Depth(T)	Width(C)
	Max	Min	Ref	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
0	.119	.099	.035	.023	.016	.015	.010	.062	.035	.014	.026	.016	.078	0
1	.146	.123	.043	.026	.019	.019	.012	.070	.043	.015	.028	.016	.101	0
2	.172	.147	.051	.031	.023	.023	.015	.095	.055	.017	.029	.017	.124	1
3	.199	.171	.059	.035	.027	.027	.017	.100	.060	.018	.031	.018	.148	1
4	.225	.195	.067	.039	.031	.030	.020	.121	.081	.018	.032	.019	.172	1
5	.252	.220	.075	.043	.035	.034	.022	.147	.074	.027	.034	.020	.196	2
6	.279	.244	.083	.048	.039	.038	.024	.167	.094	.029	.036	.021	.220	2
8	.332	.292	.100	.054	.045	.045	.029	.182	.109	.030	.039	.023	.267	2
10	.385	.340	.116	.060	.050	.053	.034	.197	.124	.032	.042	.025	.313	2
12	.438	.389	.132	.067	.056	.060	.039	.261	.144	.035	.045	.027	.362	3
1/4	.507	.452	.153	.075	.064	.070	.046	.276	.159	.036	.050	.029	.424	3
5/16	.635	.568	.191	.084	.072	.088	.058	.358	.205	.061	.057	.034	.539	4
3/8	.762	.685	.230	.094	.081	.106	.070	.386	.234	.065	.065	.039	.653	4
1/2	.875	.775	.223	.106	.091	.103	.065	.417	.265	.069	.081	.049	.739	4

Flat Head 100° For Machine Screw                             ANSI/ASME B18.6.3 1972
Nominal Size	Head Dimensions				Slot Dimensions				Recess Dimensions			Protrusion Above Gaging Dia.		Gaging Dia.	Driver Size
	Diameter		Height		Width		Depth		Dia.	Depth	Width
	Max	Min		Ref	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
0	.119	.096		.026	.023	.016	.013	.008	.054	.027	.012	.020	.012	.074	0
2	.172	.143		.037	.031	.023	.019	.012	.088	.048	.012	.022	.014	.121	1
4	.225	.191		.049	.039	.031	.024	.017	.110	.070	.018	.025	.016	.167	1
6	.279	.238		.060	.048	.039	.030	.022	.147	.074	.027	.028	.017	.214	2
8	.332	.285		.072	.054	.045	.036	.027	.162	.089	.028	.031	.019	.261	2
10	.385	.333		.083	.060	.050	.042	.031	.177	.104	.030	.034	.021	.307	2
1/4	.507	.442		.110	.075	.064	.055	.042	.240	.123	.033	.040	.025	.415	3