STANDARD TAP DIMENSIONS • GROUND THREAD

STANDARD TAP DIMENSIONS • GROUND THREAD

(Ref. USCTI Table 302, general dimensions)



SPECIAL TAPS

Nominal Diameter		Mach.	Nominal	Nominal	Black	Tap Dimensions -- Inches
Range-Inches		Screw	Fractional	Metric	Design	Overall	Thread	Square	Shank	Size of
Over	To(Incl.)	Size No.	Diameter	Diameter	No.	Length (L)	Length (l)	Length (l2)	Diameter (d1)	Square (a)
0.0520	0.0650	0          (.0600)		M1.6 (.0630)	1	1.63	0.31	0.19	1.1410	0.1100
0.0650	0.0780	1          (.0730)		M1.8 (0709)	1	1.69	0.38	0.19	1.1410	0.1100
0.0780	0.0910	2          (.0860)		M2(0787, M2.2 (.0866)	1	1.75	0.44	0.19	1.1410	0.1100
0.0910	0.1040	3          (.0990)		M2.5 (.0984)	1	1.81	0.50	0.19	1.1410	0.1100
0.1040	0.1170	4          (.1120)			1	1.88	0.56	0.19	1.1410	0.1100
0.1170	0.1300	5          (.1250)		M3 (.1181)	1	1.94	0.63	0.19	1.1410	0.1100
0.1300	0.1450	6            (1380)		M3.5 (.1378)	1	2.00	0.69	0.25	1.1410	0.1100
0.1450	0.1710	8           (.1640)		M4 (.1575)	1	2.13	0.75	0.25	0.1680	0.1310
0.1710	0.1970	10         (.1900)		M4.5(.1772), M5(.1969)	1	2.38	0.88	0.28	0.1940	0.1520
0.1970	0.2230	12         (.2160)			1	2.38	0.94	0.31	0.2200	0.1650
0.2230	0.2600		1/4            (.2500)	M6 (.2362)	2	2.50	1.00	0.38	0.2550	0.1910
0.2600	0.3230		5/16          (.3125)	M7 (.2756), M8(.3150)	2	2.72	1.13	0.44	0.3180	0.2380
0.3230	0.3950		3/8             (.3750)	M10 (.3937)	2	2.94	1.25	0.41	0.3810	0.2860
0.3950	0.4480		7/16          (.4375)		3	3.16	1.44	0.44	0.3230	0.2420
0.4480	0.5100		1/2            (.5000)	M12 (.4724)	3	3.38	1.66	0.50	0.3670	0.2750
0.5100	0.5730		9/16          (.5625)	M14 (.5512)	3	3.59	1.66	0.56	0.4290	0.3220
0.5730	0.6350		5/8            (.6250)	M16 (.6299)	3	3.81	1.81	0.63	0.4800	0.3600
0.6350	0.7090		11/16        (.6875)	M18 (.7087)	3	4.03	1.81	0.69	0.5420	0.4060
0.7090	0.7600		3/4             (.7500)		3	4.25	2.00	0.69	0.5900	0.4420
0.7600	0.8230		13/16         (.8125)	M20 (.7874)	3	4.47	2.00	0.75	0.6520	0.4890
0.8230	0.8850		7/8             (.8750)	M22 (.8661)	3	4.69	2.22	0.75	0.6970	0.5230
0.8850	0.9480		15/16        (.9375)	M24 (.9449)	3	4.91	2.22	0.81	0.7600	0.5700
0.9480	1.0100		1               (1.0000)	M25 (.9843)	3	5.13	2.50	0.88	0.8000	0.6000
1.0100	1.0730		1-1/16    (1.0625)	M27 (1.0630)	3	5.13	2.50	0.88	0.8960	0.6720
1.0730	1.1350		1-1/8       (1.1250)		3	5.44	2.56	1.00	0.8960	0.6720
1.1350	1.1980		1-3/16    (1.1875)	M30 (1.18111)	3	5.44	2.56	1.00	1.0210	0.7660
1.1980	1.2600		1-1/4      (1.2500)		3	5.75	2.56	1.00	1.0210	0.7660
1.2600	1.3230		1-5/16    (1.3125)	M33 (1.2992)	3	5.75	2.56	1.06	1.1080	0.8310
1.3230	1.3850		1-3/8      (1.3750)		3	6.06	3.00	1.06	1.1080	0.8310
1.3580	1.4480		1-7/16    (1.4375)	M36 (1.4173)	3	6.06	3.00	1.13	1.2330	0.9250
1.4480	1.5100		1-1/2      (1.5000)		3	6.38	3.00	1.13	1.2330	0.9250
1.5100	7.6350		1-5/8         (1.625)	M39 (1.5354)	3	6.69	3.19	1.13	1.3050	0.9790
1.6350	1.7600		1-3/4       (1.7500)	M42 (1.6535)	3	7.00	3.19	1.25	1.4300	1.0720
1.7600	1.8850		1-7/8       (1.8750)		3	7.31	3.56	1.25	1.5190	1.1390
1.8850	2.0100		2               (2.0000)	M48 (1.8898)	3	7.63	3.56	1.38	1.6440	1.2330
2.010	2.135		2 1/8   (2.1250)		3	8.00	3.56	1.38	1.7690	1.327
2.135	2.260		2 1/4   (2.2500)	M56 (2.2047)	3	8.25	3.56	1.44	1.8940	1.420
2.260	2.385		2 3/8   (2.3750)		3	8.50	4.00	1.44	2.0190	1.514
2.385	2.510		2 1/2   (2.5000)		3	8.75	4.00	1.50	2.1000	1.575
2.510	2.635		2 5/8   (2.6250)	M64 (2.5197)	3	8.75	4.00	1.50	2.2250	1.669
2.635	2.760		2 3/4   (2.7500)		3	9.25	4.00	1.56	2.3500	1.762
2.760	2.885		2 7/8   (2.8750)	M72 (2.8346)	3	9.25	4.00	1.56	2.4750	1.856
2.885	3.010		3                (3.0000)		3	9.75	4.56	1.63	2.5430	1.907
3.010	3.135		3 1/8   (3.1250)		3	9.75	4.56	1.63	2.6680	2.001
3.135	3.260		3 1/4   (3.2500)	M80 (3.1496)	3	10.00	4.56	1.75	2.7930	2.095
3.260	3.385		3 3/8   (3.3750)		3	10.00	4.56	1.75	2.8830	2.162
3.385	3.510		3 1/2   (3.5000)		3	10.25	4.94	2.00	3.0080	2.256
3.510	3.635		3 5/8   (3.6250)	M90 (3.5433)	3	10.25	4.94	2.00	3.1330	2.350
3.635	3.760		3 3/4   (3.7500)		3	10.50	5.31	2.13	3.2170	2.413
3.760	3.885		3 7/8 (3.8750)		3	10.50	5.31	2.13	3.3420	2.506
3.885	4.010		4               (4.0000)	M100 (3.9370)	3	10.75	5.31	2.25	3.4670	2.600

Unless otherwise specified:

Special taps over 1.010” to 1.510” diameter inclusive, having 14 or more threads per inch or 1.75 millimeter pitch and finer, and sizes over 1.510” diameter with 10 or more threads per inch or 2.5 millimeter pitch and finer, are made to general dimensions shown in Table 303.

Special tap thread limits are determined by using the formulas shown in Table 331 for Unified Inch Screw Threads and Table 341 for Metric M-Profile Screw Threads

                                                                                                                       

NOTES

Tap sizes .395” and smaller have an external center on the thread end (may be removed on bottoming taps). Sizes .223” and smaller have an external center on the shank end. Sizes .224” thru .395 have truncated partial cone centers on the shank end (length of cone approx. ¼ of diameter shank). Sizes over .395” have internal centers on both the thread and shank ends.

For standard thread limits and tolerances for United Screw Threads see table 327 and for Metric Threads see table 337.

For eccentricity tolerances of tap elements see table 317.

For more info please vist www.taylortool.com

Tolerance
Element	Nominal Diameter		Direction
	Range in Inches			Tolerance
	Over	To(Inc.)		(Inches)
Length Overall - L	0.0520	1.0100	Plus or Minus	0.031
	1.0100	4.0100	Plus or Minus	0.063
Length of thread - l	0.0520	0.2230	Plus or Minus	0.047
	0.2230	0.5100	Plus or Minus	0.063
	0.5100	1.5100	Plus or Minus	0.094
	1.5100	4.0100	Plus or Minus	0.125
Length of square -  l2	0.0520	1.0100	Plus or Minus	0.031
	1.0100	4.0100	Plus or Minus	0.063
Diameter of Shank - d1	0.0520	0.2230	Minus	0.0015
	0.2230	0.6350	Minus	0.0015
	0.6350	1.0100	Minus	.0020
	1.0100	1.5100	Minus	.0020
	1.5100	2.0100	Minus	.0030
	2.0100	4.0100	Minus	.0030
Size of square - a	0.0520	0.5100	Minus	.004
	0.5100	1.0100	Minus	.006
	1.0100	2.0100	Minus	.008
	2.0100	4.0100	Minus	.010