Pan Head Screw Style - The Thelen Channel

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Machine Screw Head Dimensions

Pan Head

The pan head is recommended for new designs and to replace round, truss, and binding heads. It provides a low, large diameter head, but typically has a high outer edge along the outer periphery of the head where driving action is most effective for high tightening torques. It also has a slightly different head contour with a recessed head.
This table references ANSI B18.6.3

Size	A		H		H1		J		T		M		G	N	Phillips Driver Size
	Head Diameter		Height of Head				Slot Width		Slot Depth		Dimensions of Recess
	Head Diameter		Slotted		Recessed		Slot Width		Slot Depth		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

This page was last updated 04/24/06 10:42 AM 2494