End Mill Depth

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Composition, rigidity, and size of the end mill greatly influence end mill deflection.

Rule of thumb for depth of cut			Standard Length of Cut for 2,3 and 4 Fute End Mills
End Mill Size	Minimum Corner Radius	Maximum Depth of cut	End Mill Size	Stub	Regular	Long	Extra Long
.0625	.0313	.218	.0625	.093	.218	-	-
.125	.0625	.500	.125	.1875	.375	.750	-
.1875	.093	.750	.1875	.281	.500	1.00	-
.250	.125	1.00	.250	.375	.625	1.250	1.750
.375	.1875	1.250	.375	.562	.750	1.50	2.50
.500	.250	1.625	.500	.750	1.250	2.00	3.00
.750	.375	2.00	.750	1.00	1.625	2.00-3.00	4.00
1.00	.500	4.00	1.00	1.00	2.00	2.00-4.00	4.00-6.00