Maryland metrics
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MARYLAND METRICS THREAD DATA CHARTS NATIONAL PIPE TAPERED THREAD (NPT) NPT Thread - American Standard Taper Pipe Thread (ANSI/ASME B1.20.1), Taper 1:16 Thread Form Data - Basic Dimensions of American National Standard Taper Threads, NPT (National Pipe Tapered) Nomin al Pipe Size (inch ) Numbe r of threa ds per inch Outsi de Diame ter (inch ) Outsi de Diame ter (mm) Pitch of thread Depth of thread Truncatio n, max.”** Pitch diameter at plane of hand-tight engagement Length from end of pipe to plane of hand- tight engagemen t Length of useful thread Length of washout thread Pitch Diamet er at Beginn ing of Extern al Thread Start (inch) Effect ive Thread , Extern al Diamet er (inch) P h l E L1 L2 in mm in mm in mm in mm in Threa ds in Threa ds in Threa ds 1⁄16 27 0.312 5 7.938 0.037 04 0.9 41 0.029 63 0.7 53 0.2811 8 0.1 6 0.26 11 0.12 85 3.47 0.2711 8 0.2875 0 1/8" 27 0.405 10.28 7 0.037 04 0.9 41 0.029 63 0.7 53 0.003 60 0.0 91 0.3736 0 9.489 0.1 62 4.36 0.26 39 7.12 0.12 85 3.47 0.3635 1 0.3800 0 1/4" 18 0.540 13.71 6 0.055 56 1.4 11 0.044 44 1.1 29 0.004 90 0.1 24 0.4916 3 12.48 7 0.2 28 4.10 0.40 18 7.23 0.19 28 3.47 0.4773 9 0.5025 0 3/8" 18 0.675 17.14 5 0.055 56 1.4 11 0.044 44 1.1 29 0.004 90 0.1 24 0.6270 1 15.92 6 0.2 40 4.32 0.04 78 7.34 0.19 28 3.47 0.6120 1 0.6375 0 1/2" 14 0.840 21.33 6 0.071 43 1.8 14 0.057 14 1.4 51 0.005 60 0.1 42 0.7784 3 19.77 2 0.3 20 4.48 0.53 37 7.47 0.24 78 3.47 0.7584 3 0.7917 9 3/4" 14 1.050 26.67 0 0.071 43 1.8 14 0.057 14 1.4 51 0.005 60 0.1 42 0.9888 7 25.11 7 0.3 39 4.75 0.54 57 7.64 0.24 78 3.47 0.9676 8 1.0017 9 1" 11.5 1.315 33.40 0.086 2.2 0.069 1.7 0.006 0.1 1.2386 31.46 0.4 4.60 0.68 7.85 0.30 3.47 1.2136 1.2563
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Transcript of Maryland metrics
MARYLAND METRICS THREAD DATA CHARTS
NATIONAL PIPE TAPERED THREAD (NPT) NPT Thread - American Standard Taper Pipe Thread (ANSI/ASME B1.20.1), Taper 1:16
Thread Form Data - Basic Dimensions of American National Standard Taper Threads, NPT (National Pipe Tapered)
Nominal Pipe Size (inch)
Number of
threads per inch
Outside Diamet
er (inch)
Outside Diameter (mm)
Pitch of thread
Depth of thread
Truncation, max.”**
Pitch diameter at plane of hand-tight
engagement
Length from end of pipe to plane of hand-tight
engagement
Length of useful thread
Length of washout thread
Pitch Diamete
r at Beginnin
g of External Thread Start (inch)
Effective
Thread, Externa
l Diamet
er (inch)
P h l E L1 L2
in mm in mm in mm in mm inThread
s inThread
s inThread
s
1⁄16 27 0.3125 7.9380.0370
40.94
10.0296
30.75
3 0.28118 0.160.261
10.128
5 3.47 0.27118 0.28750
1/8" 27 0.405 10.2870.0370
40.94
10.0296
30.75
30.0036
00.09
1 0.37360 9.4890.16
2 4.360.263
9 7.120.128
5 3.47 0.36351 0.38000
1/4" 18 0.540 13.7160.0555
61.41
10.0444
41.12
90.0049
00.12
4 0.49163 12.4870.22
8 4.100.401
8 7.230.192
8 3.47 0.47739 0.50250
3/8" 18 0.675 17.1450.0555
61.41
10.0444
41.12
90.0049
00.12
4 0.62701 15.9260.24
0 4.320.047
8 7.340.192
8 3.47 0.61201 0.63750
1/2" 14 0.840 21.3360.0714
31.81
40.0571
41.45
10.0056
00.14
2 0.77843 19.7720.32
0 4.480.533
7 7.470.247
8 3.47 0.75843 0.79179
3/4" 14 1.050 26.6700.0714
31.81
40.0571
41.45
10.0056
00.14
2 0.98887 25.1170.33
9 4.750.545
7 7.640.247
8 3.47 0.96768 1.00179
1" 11.5 1.315 33.4010.0869
62.20
90.0695
71.76
70.0063
00.16
0 1.23863 31.4610.40
0 4.600.682
8 7.850.301
7 3.47 1.21363 1.25630
1-1/4" 11.5 1.660 42.1640.0869
62.20
90.0695
71.76
70.0063
00.16
0 1.58338 40.2180.42
0 4.830.706
8 8.130.301
7 3.47 1.55713 1.60130
1-1/2" 11.5 1.900 48.2600.0869
62.20
90.0695
71.76
70.0063
00.16
0 1.82234 46.2870.40
2 4.830.723
5 8.320.301
7 3.47 1.79609 1.84130
2" 11.5 2.375 60.3250.0869
62.20
90.0695
71.76
70.0063
00.16
0 2.29627 58.3250.43
6 5.010.756
5 8.700.301
7 3.47 2.26902 2.31630
2-1/2" 8 2.875 73.0250.1250
03.17
50.1000
02.54
00.0078
00.19
8 2.76215 70.1590.68
2 5.461.137
5 9.100.433
7 3.47 2.71953 2.79062
3" 8 3.500 88.9000.1250
03.17
50.1000
02.54
00.0078
00.19
8 3.38850 86.0680.76
6 6.131.200
0 9.600.433
7 3.47 3.34062 3.41562
3-1/2" 8 4101.60
00.1250
03.17
50.1000
02.54
00.0078
00.19
8 3.88881 98.7760.82
1 6.571.250
0 10.000.433
7 3.47 3.83750 3.91562
4" 8 4.5114.30
00.1250
03.17
50.1000
02.54
00.0078
00.19
8 4.38712111.43
30.84
4 6.751.300
0 10.400.433
7 3.47 4.33438 4.41562
5" 8 5.563141.30
00.1250
03.17
50.1000
02.54
00.0078
00.19
8 5.44929138.41
20.93
7 7.501.406
3 11.250.433
7 3.47 5.39073 5.47862
6" 8 6.625168.27
50.1250
03.17
50.1000
02.54
00.0078
00.19
8 6.50597165.25
20.95
8 7.661.512
5 12.100.433
7 3.47 6.44609 6.54062
8" 8 8.625219.07
50.1250
03.17
50.1000
02.54
00.0078
00.19
8 8.50003215.90
11.63
0 8.501.712
5 13.700.433
7 3.47 8.43359 8.54062
10" 8 10.750273.05
00.1250
03.17
50.1000
02.54
00.0078
00.19
810.6209
4296.77
21.21
0 9.581.925
0 15.400.433
7 3.4710.5453
110.6656
2
12" 8 12.750323.85
00.1250
03.17
50.1000
02.54
00.0078
00.19
812.6178
1320.49
31.36
0 10.882.125
0 17.000.433
7 3.4712.5328
112.6656
2
14" 8 14355.60
00.1250
03.17
50.1000
02.54
00.0078
00.19
813.8726
2352.36
51.56
2 12.502.250
0 18.000.433
7 3.4713.7750
013.9156
2
16" 8 16406.40
00.1250
03.17
50.1000
02.54
00.0078
00.19
815.8757
5403.24
41.81
2 14.502.450
0 19.600.433
7 3.4715.7625
015.9156
2
18" 8 18457.20
00.1250
03.17
50.1000
02.54
00.0078
00.19
817.8750
0454.02
52.00
0 16.002.650
0 21.200.433
7 3.4717.7500
017.9156
2
20" 8 20508.00
00.1250
03.17
50.1000
02.54
00.0078
00.19
819.8703
1504.70
62.12
5 17.002.850
0 22.800.433
7 3.4719.7375
019.9156
2
24" 8 24609.60
00.1250
03.17
50.1000
02.54
00.0078
00.19
823.6809
4606.06
62.37
5 19.003.250
0 26.000.433
7 3.4723.7125
023.9156
2
Nominal Pipe Size
(inch)
Number of threads per
inch
Tapping Drills: Taper NPT with Reamer *Tapping Drills: Taper NPT without
ReamerTapping Drills: Straight NPS
Drill SizeEquivalents
(in)Equivalents
(mm) Drill SizeEquivalents
(in)Equivalents
(mm) Drill SizeEquivalents
(in)Equivalents
(mm)
1⁄16 27 15/64" 0.2344 5.9531 C 0.242 6.1468 1/4" 0.25 6.35
1/8" 27 21/64" 0.3281 8.3344 Q 0.332 8.4328 11/32" 0.3438 8.7313
1/4" 18 27/64" 0.4219 10.7156 7/16" 0.4375 11.1125 7/16" 0.4375 11.1125
3/8" 18 9/16" 0.5625 14.2875 37/64" 0.5781 14.6844 19/32" 0.5938 15.0813
1/2" 14 11/16" 0.6875 17.4625 45/64" 0.7031 17.8594 23/32" 0.7188 18.2563
3/4" 14 57/64" 0.8906 22.6219 29/32" 0.9063 23.0188 15/16" 0.9375 23.8125
1" 11.5 1-1/8" 1.125 28.575 1-9/32" 1.2813 32.5438 1-5/32" 1.1563 29.3688
1-1/4" 11.5 1-15/32" 1.4688 37.3063 1-31/64" 1.4844 37.7031 1-1/2" 1.5 38.1
1-1/2" 11.5 1-23/32" 1.7188 43.6563 1-23/32" 1.7188 43.6563 1-3/4" 1.75 44.45
2" 11.5 2-5/32" 2.1563 54.7688 2-3/16" 2.1875 55.5625 2-3/16" 2.1875 55.5625
2-1/2" 8 2-25/32" 2.7813 70.6438 2-5/8" 2.625 66.675 2-5/8" 2.625 66.675
3" 8 3-9/32" 3.2813 83.3438 3-1/4" 3.25 82.55 3-1/4" 3.25 82.55
3-1/2" 8 3-3/4" 3.75 95.25 3-3/4" 3.75 95.25 3-3/4" 3.75 95.25
4" 8 4-1/4" 4.25 107.95 4-1/4" 4.25 107.95 4-1/4" 4.25 107.95
5" 8 5-1/4" 5.25 133.35 5-9/32" 5.2813 134.1438 5-5/16" 5.3125 134.9375
6" 8 6-1/4" 6.25 158.75 6-11/32" 6.3438 161.1313 6-3/8" 6.375 161.925
Notes: * Ream the hole before tapping with a reamer having a taper of 3/4 inch per foot. Pipe Size is the accepted industry designation and does not refer to either the inside or the outside diameter (ID or OD) of a pipe or a fitting. Dimensions in Inches except where stated
E= Pitch diameter at hand-tight plane. This is also the pitch diameter at the gauge plane. **'= Truncation from point of thread triangle to flat (not shown in diagram). Minimum = 0.033P for all pitches. See table for maximum. Tolerances: When using L1 gauges to check threads, the thread is within permissible tolerance if the ring gauge face, or plug gauge notch, is +/- 1 turn from being flush with the end of the thread.
Example designation: 3/8 - 18 NPT where 3/8 = nominal pipe size 18 = number of threads per inch NPT = symbol for the thread series and form (i.e., National (American)Standard Pipe, Taper)
Note- Basic dimensions are given to four or five decimal places to eliminate errors when calculating gauge dimensions, they do not imply a greater degree of precision than is normally obtainable.
L1= Length of normal hand-tight engagement. This is also the L1 gauge length. (Longer thread engagement may be used in special applications, such as flanges for high pressure use. In such cases the pitch diameter, E, remains as specified and the diameter at the end of the pipe is proportionally smaller.)
L2= Effective Length of thread
