Screw Heads - The Thelen Channel

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	Monday, September 06, 2010

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Machine Screw Head Dimensions

Binding Head Undercut

The Binding Head has a rounded top surface and slightly tapered sides. The bearing surface is flat with the slotted variety having an annular undercut adjacent to the shank. It is a preferred design for making firm electrical connection such as ground wire connections and elminates fraying of stranded wire. it is not ordinarily recommended as a Phillips Recessed head.

Size	A		F		O		J		T		U		X
	Head Diameter		Head Height				Slot Width		Slot Depth		Dimensions of Undercut
	Head Diameter		Oval Height		Total Height		Slot Width		Slot Depth		Diameter		Depth
	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
2	.181	.171	.018	.013	.050	.043	.031	.023	.030	.020	.141	.124	.010	.005
3	.208	.197	.022	.016	.059	.052	.035	.027	.036	.025	.162	.143	.011	.006
4	.235	.223	.025	.018	.068	.061	.039	.031	.042	.030	.184	.161	.012	.007
5	.263	.249	.029	.021	.078	.069	.043	.035	.048	.035	.205	.180	.014	.009
6	.290	.275	.032	.024	.087	.078	.048	.039	.053	.040	.226	.199	.015	.010
8	.344	.326	.039	.029	.105	.095	.054	.045	.065	.050	.269	.236	.017	.012
10	.399	.378	.045	.034	.123	.112	.060	.050	.077	.060	.312	.274	.020	.015
12	.454	.430	.052	.039	.141	.130	.067	.056	.089	.070	.354	.311	.023	.018
1/4	.525	.498	.061	.046	.165	.152	.075	.064	.105	.084	.410	.360	.026	.021

This page was last updated 04/24/06 10:36 AM 2537