Hex Head and Hex Washer Head Machine Screws

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Hex and Hex Washer Head Machine Screws

Phillips Hex Washer Head Machine Screws Domestic

Phillips Hex Washer Head Machine Screws Imported

Head Dimensions
Hex Head and Hex Washer Head Machine Screws - ANSI B18.6.3 - 1998

Nominal Size	A		W	H		F		U		J		T
	Width Across Flats		Width Across Corners	Head Height		Washer Diameter		Washer Thickness		Slot Width		Slot Depth
	Max	Min	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
2	.125	.120	.134	.050	.040	.166	.154	.016	.010	-	-	-	-
4	.188	.181	.202	.060	.049	.243	.225	.019	.011	.039	.031	.042	.025
5	.188	.181	.202	.070	.058	.260	.240	.025	.015	.043	.035	.049	.030
6	.250	.244	.272	.093	.080	.328	.302	.025	.015	.048	.039	.053	.033
8	.250	.244	.272	.110	.096	.348	.322	.031	.019	.054	.045	.074	.052
10	.312	.305	.340	.120	.105	.414	.384	.031	.019	.060	.050	.080	.057
12	.312	.305	.340	.155	.139	.432	.398	.039	.022	.067	.056	.103	.077
1/4	.375	.367	.409	.190	.172	.520	.480	.050	.030	.075	.064	.111	.083
5/16	.500	.489	.545	.230	.208	.676	.624	.055	.035	.084	.072	.134	.100
3/8	.562	.551	.614	.295	.270	.780	.720	.063	.037	.094	.081	.168	.131
1/2	.750	.735	.820	.400	.367	1.040	.960	.085	.050	-	-	-	-

Domestic Phillips Hex Washer Head Machine Screws

Nominal Size	A		W	H		F		U		M	G	N	Recess Penetration Gaging Depth		Phillips Driver Size
	Width Across Flats		Width Across Corners	Head Height		Washer Diameter		Washer Thickness		Recess Dimensions
										Dia	Depth	Width
	Max	Min	Min	Max	Min	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
4	.188	.181	.202	.060	.049	.243	.225	.019	.011	.096	.055	.017	.056	.040	1
6	.250	.244	.272	.093	.080	.328	.302	.025	.015	.168	.094	.029	.095	.072	2
8	.250	.244	.272	.110	.096	.348	.322	.031	.019	.168	.094	.029	.095	.072	2
10	.312	.305	.340	.120	.105	.414	.384	.031	.019	.176	.102	.030	.103	.080	2
1/4	.375	.367	.409	.190	.172	.520	.480	.050	.030	.262	.144	.035	.139	.116	3

Imported Phillips Hex Washer Head Machine Screws

Nominal Size	A		W	H		F		U		M		G		Phillips Driver Size
	Width Across Flats		Width Across Corners	Head Height		Washer Diameter		Washer Thickness		Recess Dimensions
										Diameter		Depth
	Max	Min	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
4	.188	.181	.202	.060	.049	.243	.225	.019	.011	.102	.089	.063	.047	1
6	.250	.244	.272	.093	.080	.328	.302	.025	.015	.164	.160	.086	.079	2
8	.250	.244	.272	.110	.096	.348	.322	.031	.019	.188	.176	.120	.114	2
10	.312	.305	.340	.120	.105	.414	.384	.031	.019	.174	.161	.106	.083	2
1/4	.375	.367	.409	.190	.172	.520	.480	.050	.030	.233	.220	.156	.133	3
There is no single set of standards for the size of Phillips drives used in hex head machine screws. Variations of imported screws of this type are generally due to differences in the tooling used to manufacture the imported screws. These values are only listed as a service. We make no recommendation as to which is preferred.

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