ASME B18.6.3 Type 2 Cross Recessed Flat Countersunk Trim

Dimensions of ASME B18.6.3 Type 2 Cross Recessed Flat Countersunk Trim Head Machine Screws

Nominal Size or Basic Screw Diameter	Head Size	Shoulder Diameter, E		Head Diameter, A		Head Height, H	Recess Diameter, M	Recess Depth, T	Recess Width, N	Driver Size	Recess Penetration Gaging Depth		Protrusion Above Gaging Diameter, F		Gaging Diameter, G
Nominal Size or Basic Screw Diameter	Head Size	Max	Min	Max	Min	Head Height, H	Recess Diameter, M	Recess Depth, T	Recess Width, N	Driver Size	Max	Min	Max	Min	Gaging Diameter, G
4	3	0.112	0.106	0.187	0.167	0.052	0.133	0.072	0.030		0.053	0.041	0.031	0.018	0.148
5	4	0.125	0.119	0.212	0.191	0.060	0.151	0.082	0.032		0.064	0.052	0.032	0.019	0.172
6	4	0.138	0.131	0.212	0.191	0.052	0.151	0.082	0.032		0.064	0.052	0.032	0.019	0.172
6	5	0.138	0.131	0.237	0.215	0.068	0.169	0.094	0.035		0.077	0.064	0.034	0.020	0.196
8	5	0.164	0.157	0.237	0.215	0.052	0.169	0.094	0.035		0.077	0.064	0.034	0.020	0.196
8	6	0.164	0.157	0.262	0.238	0.069	0.188	0.106	0.038		0.089	0.075	0.036	0.021	0.220
10	8	0.190	0.181	0.312	0.285	0.085	0.224	0.124	0.043		0.113	0.099	0.039	0.023	0.267
12	8	0.216	0.207	0.312	0.285	0.069	0.224	0.124	0.043		0.113	0.099	0.039	0.023	0.267
12	10	0.216	0.207	0.362	0.333	0.101	0.260	0.148	0.048		0.137	0.122	0.042	0.025	0.313
1/4	10	0.250	0.240	0.362	0.333	0.080	0.260	0.148	0.048		0.137	0.122	0.042	0.025	0.313
1/4	12	0.250	0.240	0.412	0.380	0.112	0.297	0.172	0.054		0.162	0.145	0.045	0.027	0.362
5/16	12	0.312	0.302	0.412	0.380	0.075	0.297	0.172	0.054		0.162	0.145	0.045	0.027	0.362
5/16	1/4	0.312	0.302	0.477	0.442	0.116	0.344	0.195	0.061		0.193	0.176	0.050	0.029	0.424
3/8	5/16	0.375	0.364	0.597	0.556	0.155	0.432	0.252	0.074		0.251	0.232	0.057	0.034	0.539

Notes :

Short screws include nominal lengths up to and including 1 1/8 in. for sizes no. 5 and smaller, and 2 in. for sizes no. 6 and larger.
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.
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.