100 and 81 degree Flat Countersunk Head Screws Table ASME B 18.6.3

Dimensional size data for 100 deg Flat Countersunk Head Screws Table per. ASME B 18.6.3. The type of drive recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at the bottom to the recess.

NOTES:

Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
Point same on all drivers.

BASIC DIA	A Head Diameter	M Recess Diameter	N Recess Width
NO.0	0.119	0.061	0.012
NO.1	0.146	0.069	0.014
NO.2	0.172	0.095	0.012
NO.3	0.199	0.102	0.014
NO.4	0.225	0.117	0.018
NO.6	0.279	0.154	0.027
NO.8	0.332	0.169	0.028
NO.10	0.385	0.184	0.030
.25	0.507	0.247	0.033
.3125	0.635	0.317	0.053
.375	0.762	0.342	0.056

Dimensional size data for 81deg Flat Countersunk Head Screws Table per. ASME B 18.6.3. The type of drive recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at the bottom to the recess.

BASIC DIA	A Head Diameter	M Recess Diameter	N Recess Width
NO. 0	0.119	0.069	0.014
NO. 1	0.146	0.077	0.015
NO. 2	0.172	0.102	0.017
NO. 3	0.199	0.107	0.018
NO. 4	0.225	0.128	0.018
NO. 5	0.252	0.154	0.027
O. 6	0.279	0.174	0.029
NO. 8	0.332	0.189	0.030
NO. 10	0.385	0.204	0.032
NO. 12	0.438	0.268	0.035
.25	0.507	0.283	0.036
.3125	0.635	0.365	0.061
.375	0.762	0.393	0.065
.4375	0.812	0.409	0.068
.5	0.875	0.424	0.069
.5625	1.000	0.454	0.073
.625	1.125	0.576	0.079
.75	1.375	0.640	0.087