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Tap Eccentricity Tolerances

USCTI Table 317: Eccentricity Tolerances of Tap Elements

USCTI Table 317	Range of Sizes (Inclusive)			Cut Threads		Ground Threads
Tap Element	Inch & Machine Screw	Pipe	Metric	Eccentricity	*T.I.V.	Eccentricity	*T.I.V.
Square at central point	#0 to 1/2 inch	1/16 to 1/8 inch	M1.6 to M12	.0030	.0060	.0030	.0060
Square at central point	Over 1/2 to 4 inches	1/4 to 4 inches	Over M12 to M100	.0040	.0080	.0040	.0080
Shank	#0 to 5/16 inch	1/16 inch	M1.6 to M8	.0030	.0060	.0050	.0010
Shank	Over 5/16 to 4 inches	1/8 to 4 inches	Over M8 to M100	.0040	.0080	.0008	.0016
Major Diameter	#0 to 5/16 inch	1/16 inch	M1.6 to M8	.0025	.0050	.0005	.0010
Major Diameter	Over 5/16 to 4 inches	1/8 to 4 inches	Over M8 to M100	.0040	.0080	.0008	.0016
Pitch Diameter at first full thread	#0 to 1/2 inch	1/16 inch	M1.6 to M8	.0025	.0050	.0005	.0010
Pitch Diameter at first full thread	Over 1/2 to 4 inches	1/8 to 4 inches	Over M8 to M100	.0040	.0080	.0008	.0016
Chamfer	#0 to 1/2 inch	1/16 to 1/8 inch	M1.6 to M12	.0020	.0040	.0010	.0020
Chamfer	Over 1/2 to 4 inches	1/4 to 4 inches	Over M12 to M100	.0030	.0060	.0015	.0030

Compiled by United States Cutting Tool Institute