Flat Head Undercut Screw Style - The Thelen Channel

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	Thursday, November 20, 2008

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Machine Screw Head Dimensions

Flat Head Undercut

Similar to an 82° flat head except that the head is undercut to 70% of its normal side height. Standard for short lengths because it allows greater length of threads. It avoids the transition fillet and assembly interference. It will also fit a standard counterbored hole and is particularly adaptable to flush assemblies in thin stock.

Nom Size	A		H		J		T		M	G	N	Phillips Driver Size
	Head Dimensions				Slot Dimensions				Recess Dimensions
	Diameter		Height		Width		Depth		Dia.	Depth	Width
	Max	Min	Max	Min	Max	Min	Max	Min	Ref	Ref	Ref
0	.112	.096	.025	.018	.023	.016	.011	.007	.062	.035	.014	0
1	.137	.120	.031	.023	.026	.019	.014	.009	.070	.043	.015	0
2	.162	.144	.036	.028	.031	.023	.016	.011	.088	.048	.017	1
4	.212	.191	.047	.038	.039	.031	.022	.014	.110	.070	.018	1
5	.237	.215	.053	.043	.043	.035	.024	.016	.122	.081	.018	1
6	.262	.238	.059	.048	.048	.039	.027	.017	.140	.066	.025	2
8	.312	.285	.070	.058	.054	.045	.032	.021	.168	.094	.029	2
10	.362	.333	.081	.068	.060	.050	.037	.024	.182	.110	.030	2
12	.412	.380	.092	.078	.067	.056	.043	.028	.226	.110	.030	3
1/4	.477	.442	.107	.092	.075	.064	.050	.032	.244	.124	.032	3
5/16	.597	.556	.134	.116	.084	.072	.062	.041	.310	.157	.053	4

This page was last updated 04/24/06 10:38 AM 1142