PTC Alliance

Honing Allowances Minimum ID stock allowances for the removal of inside surface imperfections*
	Outside Diameter, Inches	Wall Thickness, Inches
	Outside Diameter, Inches		Up to .125	Over .125 to .188	Over .188 to .250	Over .250 to .375	Over .375 to .500	Over .500 to .625	Over .625
	Up to 3		.006	.007	.008	.009	.010

	Over 3 to 4		.007	.008	.009	.010	.011	.012	.014

	Over 4 to 6		.008	.009	.010	.011	.012	.013	.015

	Over 6 to 8		.008	.009	.010	.011	.013	.014	.016

	Over 8 to 10.750				.011	.012	.013	.015	.017

For steel grades with over 0.29% carbon, a minimum of 0.015" stock is required for removal of decarburization.

* Allowances are not intended to cover sub-surface steel imperfections such as non-metallic inclusions.

Skiving Allowances Minimum ID stock allowances for the removal of inside surface imperfections*
	Outside Diameter, Inches	Wall Thickness, Inches
	Outside Diameter, Inches		Up to .125	Over .125 to .188	Over .188 to .250	Over .250 to .375	Over .375 to .500	Over .500 to .625	Over .625
	Up to 3		.012	.014	.016	.018	.020

	Over 3 to 4		.013	.015	.017	.019	.021	.024	.026

	Over 4 to 6		.014	.016	.018	.020	.022	.025	.027

	Over 6 to 8		.016	.018	.020	.022	.024	.026	.028

	Over 8 to 10.750				.021	.023	.025	.027	.029

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