STANDARD TAP DIMENSIONS • GROUND THREAD
(Ref. USCTI
Table 302, general dimensions)
SPECIAL TAPS
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
|
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
|
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Very useful content with excellent ideas. I really appreciate your post, thank you for sharing.The reamers are available in different sizes and shapes in the market. Special drilling machines are available in the market, which provide you the option to put a detachable reamer and use it when needed. You also have the option of sizes that you can use and change for your need and convenience. Drilling set up is like a small suit case with different types of detachable reamers provided for use. It is quite easy and user friendly to be used even by noveous, though needs to be handled with care during first few uses.