Smith Fastener Company - Pan Head Machine Screw Head Dimensions

**Head Dimensions for Pan Head Machine Screws and SEMS - ANSI B18.6.3**
Nominal Size	A	H	H1	J	T	M	G	N	Phillips Driver Size
Head Diameter	Height of Head	Slot Width	Slot Depth	Dimensions of Recess
Slotted	Recessed	Diameter	Depth	Width
Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
0	.116	.104	.039	.031	.044	.036	.023	.016	.022	.014	.067	.054	.039	.013	0
2	.167	.155	.053	.045	.062	.053	.031	.023	.031	.022	.104	.091	.059	.017	1
3	.193	.180	.060	.051	.071	.062	.035	.027	.036	.026	.112	.099	.068	.019	1
4	.219	.205	.068	.058	.080	.070	.039	.031	.040	.030	.122	.109	.078	.019	1
5	.245	.231	.075	.065	.089	.079	.043	.035	.045	.034	.158	.145	.083	.028	2
6	.270	.256	.082	.072	.097	.087	.048	.039	.050	.037	.166	.153	.091	.028	2
8	.322	.306	.096	.085	.115	.105	.054	.045	.058	.045	.182	.169	.108	.030	2
10	.373	.357	.110	.099	.133	.122	.060	.050	.068	.053	.199	.186	.124	.031	2
12	.425	.407	.125	.1125	.151	.139	.067	.056	.077	.061	.259	.246	.141	.034	3
1/4	.492	.473	.144	.130	.175	.162	.075	.064	.087	.070	.281	.268	.161	.036	3
5/16	.615	.594	.178	.162	.218	.203	.084	.072	.106	.085	.350	.337	.193	.059	4
3/8	.740	.716	.212	.195	.261	.244	.094	.081	.124	.100	.389	.376	.233	.065	4

**Combination Drive Pan Head Machine Screws**
Nominal Screw Size	G	H	J	A	M	T	N	Recess Penetration	Driver Size
Head Dimensions	Slot Dimensions	Recess Dimensions
Head Diameter	Head Height	Width	Depth	Width	Depth	Wing Depth
Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Min	Max	Min
4	.219	.205	.080	.070	.039	.031	.040	.030	.122	.109	.078	.060	.019	.071	.053	1
6	.270	.256	.097	.087	.048	.039	.050	.037	.166	.153	.091	.066	.028	.080	.055	2
8	.322	.306	.115	.105	.054	.045	.058	.045	.182	.169	.108	.082	.030	.097	.071	2
10	.373	.357	.133	.122	.060	.050	.068	.053	.199	.186	.124	.100	.031	.113	.089	2
12	.425	.407	.125	.112	.067	.056	.077	.061	.259	.246	.141	.115	.034	.124	.098	3
1/4	.492	.473	.175	.162	.075	.064	.087	.070	.281	.268	.161	.135	.036	.144	.118	3
5/16	.615	.594	.218	.203	.084	.072	.106	.085	.350	.337	.193	.169	.059	.173	.149	4

**Torx® Drive Pan Head Machine Screws - Camcar**
Screw Size	D		H		R	G		Driver Size
	Head Dimensions				Recess Dimensions
	Head Diameter		Head Height		Diameter (Ref)	Gauge Penetration (Min)	Maximum Penetration (Falloway)
	Max	Min	Max	Min	Diameter (Ref)	Gauge Penetration (Min)	Maximum Penetration (Falloway)
2	.167	.155	.062	.053	.094	.030	.022	T8
4	.219	.205	.080	.070	.111	.035	.026	T10
6	.270	.256	.097	.087	.132	.045	.031	T15
8	.322	.306	.115	.105	.155	.055	.036	T20
10	.373	.357	.133	.122	.178	.070	.040	T25
1/4	.492	.473	.175	.162	.221	.085	.044	T30
5/16	.615	.594	.218	.203	.266	.105	.047	T40
Torx® is a registered trademark of the Camcar Corporation, division of Textron Industries.

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**Pozidrive® (Type 1A) Pan Head Machine Screws - ASME B18.6.3 1998**
Screw Size	A		H		M		G		N	Recess Penetration Gaging Depth		Driver Size
	Head Diameter		Head Height		Recess Dimensions
	Head Diameter		Head Height		Diameter		Depth		Width
	Max	Min	Max	Min	Max	Min	Max	Min	Min	Max	Min
2	.167	.155	.062	.053	.104	.091	.064	.048	.028	.053	.037	1
4	.219	.205	.080	.070	.122	.109	.083	.067	.029	.072	.056	1
6	.270	.256	.097	.087	.162	.149	.092	.074	.040	.076	.058	2
8	.322	.306	.115	.105	.177	.164	.108	.090	.041	.092	.074	2
10	.373	.357	.133	.122	.193	.180	.125	.106	.041	.108	.090	2
12	.425	.407	.151	.139	.254	.241	.139	.121	.056	.117	.099	3
1/4	.492	.473	.175	.162	.273	.260	.159	.141	.057	.137	.119	3
Pozidriv® is a trademark of the Phillips Screw Company. Our fasteners with the 1A-drive are not manufactured by or connected with the producers of Pozidriv® fasteners.

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**Square Socket Pan Head Machine Screws - IFI**
Nominal Size or Basic Screw Diameter		A		H		M		T		P		Driver Size
		Head Diameter		Head Height		Recess Square		Recess Depth		Penetration Gaging Depth
		Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
4	.112	.219	.205	.086	.075	.071	.0696	.073	.063	.038	.032	0
6	.138	.270	.256	.103	.091	.091	.090	.113	.105	.065	.057	1
8	.164	.322	.306	.120	.107	.1126	.111	.140	.119	.075	.065	2
10	.1900	.373	.357	.137	.123	.1126	.111	.140	.119	.075	.065	2
12	.2160	.425	.407	.153	.139	.133	.1315	.165	.155	.095	.085	3
1/4	.2500	.492	.473	.175	.160	.133	.1315	.165	.155	.095	.085	3
5/16	.3125	.615	.594	.216	.198	.191	.1895	.201	.191	.100	.090	4
Square Socket type of recess has a square center opening, with slightly tapered sides and a conical bottom.

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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2000 by Smith Fastener Company - Last updated: May 22nd, 2006 - http://www.smithfast.com/pancomb.htm