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NPT national pipe thread taper specification table

2022-01-10 5:37:37 No Comments News / Trade News

NPT- National Pipe Thread Taper Specification Sheet, ANSI B1.20.1

NPT- National Pipe Thread Taper Specification sheet, ANSI B1.20.1,NPT Pipe Thread – Dimensions to ANSI/ASME B1.20.1

Taper of American standard pipe threads
Pipe size

(inches)

 Number of threads per inch – pitch Approximate thread length (in.) The approximate number where t is cut off
Approximate full threaded construction, hand and spanner

(inches)

Nominal outer pipe diameter

Outer diameter

(inches)
Tap the bit

(inches)
1/16″ 27 0.313
1/8″ 27 3/8 10 A quarter 0.405 R
1/4″ 18 5/8 11 3/8 0.540 7/16
3/8″ 18 5/8 11 3/8 0.675 37/64
1/2″ 14 3/4 10 7/16 0.840 23/32
3/4″ 14 3/4 10 1/2 1.050 59/64
1″ 11-1/2 7/8 10 9/16 1.315 1-5/32
1-1/4″ 11-1/2 1 11 9/16 1.660 1-1/2
1-1/2″ 11-1/2 1 11 9/16 1.900 1-47/64
2. “” 11-1/2 1 11 5/8 2.375 2-7/32
2-1/2″ 8 1 1/2 12 7/8 2.875 2-5/8
3″ 8 1 1/2 12 1 3.500 3-1/4
3-1/2″ 8 1 5/8 13 1 1/16 4.000 3-3/4
4″ 8 1 5/8 13 1 1/16 4.500 4-1/4
4 1/2″ 8 5.000 4-3/4
5. “” 8 1 3/4 14 1 3/16 5.563 5-9/32
6″ 8 1 3/4 14 1 3/16 6.625 6-11/32
8″ 8 1 7/8 15 1 5/16 8.625
10″ 8 2 16 1 1/2 10.750
12″ 8 2 1/8 17 1 5/8 12.750
14″ 8 14.000
16″ 8 16.000

Specification sheet for coarse thread and Fine thread series for ANSI B1.1 unified bolt thread

UNC coarse teeth series

Nominal diameter

 (in)

 Threads per inch (in.) Diameter (medium) Diameter (mm) Tapping hole size (mm) Pitch (mm)
1 64 0.073 1.854 1.50 0.397
2 56 0.086 2.184 1.80 0.453
3 48 0.099 2.515 2.10 0.529
4 40 0.112 2.845 2.35 0.635
5 40 0.125 3.175 2.65 0.635
6 32 0.138 3.505 2.85 0.794
8 32 0.164 4.166 3.50 0.794
10 24 0.190 4.826 4.00 1.058
12 24 0.216 5.486 4.65 1.058
1/4″ 20 0.250 6.350 5.35 1.270
5/16″ 18 0.313 7.938 6.80 1.411
3/8″ 16 0.375 9.525 8.25 1.587
7/16″ 14 0.438 11.112 9.65 1.814
1/2″ 13 0.500 12.700 11.15 1.954
9/16″ 12 0.563 14.288 12.60 2.117
5/8″ 11 0.625 15.875 14.05 2.309
3/4″ 10 0.750 19.050 17.00 2.540
7/8″ 9 0.875 22.225 20.00 2.822
1″ 8 1.000 25.400 22.85 3.175
1 1/8″ 7 1.125 28.575 25.65 3.628
1 1/4″ 7 1.250 31.750 28.85 3.628
1 3/8″ 6 1.375 43.925 31.55 4.233
1 1/2″ 6 1.500 38.100 34.70 4.233
1 3/4″ 5 1.750 44.450 40.40 5.080
2. “” 4 1/2 2.000 50.800 46.30 5.644
2 1/4″ 4 1/2 2.250 57.150 52.65 5.644
2 1/2″ 4 2.500 63.500 58.50 6.350
2 3/4″ 4 2.750 69.850 64.75 6.350
3″ 4 3.000 63.500 71.10 6.350
3 1/4″ 4 3.250 82.550 77.45 6.350
3 1/2″ 4 3.500 88.900 83.80 6.350
3 3/4″ 4 3.750 95.250 90.15 6.350
4″ 4 4.000 101.600 96.50 6.350

UNF Fine teeth series

Nominal diameter

 (in)

 Threads per inch (in.) Diameter (medium) Diameter (mm) Tapping hole size (mm) Pitch (mm)
0 80 0.060 1.524 1.25 0.317
1 72 0.073 1.854 1.55 0.353
2 64 0.068 2.184 1.90 0.397
3 56 0.099 2.515 2.15 0.453
4 48 0.112 2.845 2.40 0.529
5 44 0.125 3.175 2.70 0.577
6 40 0.138 3.505 2.95 0.635
8 36 0.164 4.166 3.50 0.705
10 32 0.190 4.826 4.10 0.794
12 28 0.216 5.486 4.70 0.907
1/4″ 28 0.250 6.350 5.50 0.907
5/16″ 24 0.313 7.938 6.90 1.058
3/8″ 24 0.375 9.525 8.50 1.058
7/16″ 20 0.438 11.112 9.90 1.270
1/2″ 20 0.500 12.700 11.50 1.270
9/16″ 18 0.563 14.288 12.90 1.411
5/8″ 18 0.625 15.875 14.50 1.411
3/4″ 16 0.750 19.050 17.50 1.587
7/8″ 14 0.875 22.225 20.40 1.814
1″ 12 1.000 25.400 23.25 2.117
1 1/8″ 12 1.125 28.575 26.50 2.117
1 1/4″ 12 1.250 31.750 29.50 2.117
1 3/8″ 12 1.375 43.925 32.75 2.117
1 1/2″ 12 1.500 38.100 36.00 2.117

Specification sheet for bolt thread

Metric, inch bolt thread specification table Please select conditions: Standard: fractional screw size metric, unhooked inch thread: coarse thread, fine thread

British coarse tooth screw thread tap bits

Tap or The diameter (in) The diameter of Thread count pitch Recommended drill sizes for metal holes
Screw specification  (mm) (TPI)  (mm)
# 0000-160 0.021 0.5334 160 0.159 1/64 in
# 000-120 0.034 0.8636 120 0.212 # 71
M1x0. 2 0.0394 1 ~ 127 0.2 The 0.8 mm
25 M1x0. 0.0394 1 ~ 102 0.25 The 0.75 mm
M1.1 x0.25 0.0433 1.1 ~ 102 0.25 The 0.85 mm
M1.1 x0.2 0.0433 1.1 ~ 127 0.2 The 0.9 mm
# 00-90 0.047 1.1938 90 0.282 # 65
M1.2 x0.2 0.0472 1.2 ~ 127 0.2 1 mm
M1.2 x0.25 0.0472 1.2 ~ 102 0.25 The 0.95 mm
M1.4 x0.2 0.0551 1.4 ~ 127 0.2 The 1.2 mm
M1.4 x0.3 0.0551 1.4 ~ 85 0.3 The 1.1 mm
# 0-80 0.06 1.524 80 0.318 3/64 in
M1.6-m7 x0.2 0.063 1.6 ~ 127 0.2 The 1.4 mm
M1.6-m7 x0.35 0.063 1.6 ~ 73 0.35 The 1.25 mm
M1.8 x0.2 0.0709 1.8 ~ 127 0.2 The 1.6 mm
M1.8 x0.35 0.0709 1.8 ~ 73 0.35 The 1.45 mm
# 1-64 0.073 1.8542 64 0.397 # 52
# 1-72 0.073 1.8542 72 0.353 # 53
25 M2x0. 0.0787 2 ~ 102 0.25 The 1.75 mm
M2x0. 4 0.0787 2 ~ 64 0.4 The 1.6 mm
# 2-56 0.086 2.1844 56 0.454 # 50
# 2-64 0.086 2.1844 64 0.397 # 50
M2.2 x0.25 0.0866 2.2 ~ 102 0.25 The 1.95 mm
M2.2 x0.45 0.0866 2.2 ~ 57 0.45 The 1.75 mm
M2.5 x0.35 0.0984 2.5 ~ 73 0.35 The 2.1 mm
M2.5 x0.45 0.0984 2.5 ~ 57 0.45 The 2.05 mm
# 3-48 0.099 2.5146 48 0.529 # 47
# 3-56 0.099 2.5146 56 0.454 # 45
# 4-40 0.112 2.8448 40 0.635 # 43
# 4-48 0.112 2.8448 48 0.529 # 42
M3x0. 35 0.1181 3 ~ 73 0.35 The 2.6 mm
M3x0.5 0.1181 3 ~ 51 0.5 The 2.5 mm
# 5-40 0.125 3.175 40 0.635 # 39
# 5-44 0.125 3.175 44 0.577 # 37
M3.5 x0.35 0.1378 3.5 ~ 73 0.35 The 3.1 mm
M3.5 x0.6 0.1378 3.5 ~ 43 0.6 The 2.9 mm
# 6-32 0.138 3.5052 32 0.794 # 36
# 6-40 0.138 3.5052 40 0.635 # 33
M4x0.35 0.1575 4 ~ 73 0.35 The 3.6 mm
M4x0.5 0.1575 4 ~ 51 0.5 The 3.5 mm
7 M4x0. 0.1575 4 ~ 37 0.7 The 3.3 mm
# 8-32 0.164 4.1656 32 0.794 # 29
# 8-36 0.164 4.1656 36 0.706 # 29
M4.5 x0.5 0.1772 4.5 ~ 51 0.5 4 mm
M4.5 x0.75 0.1772 4.5 ~ 34 0.75 The 3.8 mm
# 10-32 0.19 4.826 32 0.794 # 21
# 10 to 24 0.19 4.826 24 1.058 # 25
M5x0.5 0.1969 5 ~ 51 0.5 The 4.5 mm
8 M5x0. 0.1969 5 ~ 32 0.8 The 4.2 mm
# 12 to 24 0.216 5.4864 24 1.058 # 17
# 12 to 28 0.216 5.4864 28 0.907 # 15
M5.5 x0.5 0.2165 5.5 ~ 51 0.5 5 mm
M6x0.5 0.2362 6 ~ 51 0.5 The 5.5 mm
M6x0. 75 0.2362 6 ~ 34 0.75 The 5.2 mm
M6x1 0.2362 6 ~ 26 1 5 mm
1/4-20 0.25 6.35 20 1.27 # 7
1/4-28 0.25 6.35 28 0.907 # 3
M7x0. 75 0.2756 7 ~ 34 0.75 The 6.2 mm
M7x1 0.2756 7 ~ 26 1 6 mm
5/16-18 0.3125 7.9375 18 1.411 F
5/16-24 0.3125 7.9375 24 1.058 I
M8x0.5 0.315 8 ~ 51 0.5 The 7.5 mm
M8x0. 75 0.315 8 ~ 34 0.75 The 7.2 mm
M8x1 0.315 8 ~ 26 1 7 mm
25 M8x1. 0.315 8 ~ 21 1.25 The 6.8 mm
M9x0. 75 0.3543 9 ~ 34 0.75 The 8.2 mm
M9x1 0.3543 9 ~ 26 1 8 mm
25 M9x1. 0.3543 9 ~ 21 1.25 The 7.8 mm
2003/8/24 0.375 9.525 24 1.058 Q
2003/8/16 0.375 9.525 16 1.588 5/16 in
M10x0. 75 0.3937 10 ~ 34 0.75 The 9.2 mm
M10x1.5 0.3937 10 ~ 17 1.5 The 8.5 mm
25 M10x1. 0.3937 10 ~ 21 1.25 The 8.8 mm
M10x1 0.3937 10 ~ 26 1 9 mm
M11x0. 75 0.4331 11 ~ 34 0.75 The 10.2 mm
M11x1 0.4331 11 ~ 26 1 10 mm
M11x1.5 0.4331 11 ~ 17 1.5 The 9.5 mm
7/16-14 0.4375 11.1125 14 1.814 U
7/16-20 0.4375 11.1125 20 1.27 25/64 in
M12x1.5 0.4724 12 ~ 17 1.5 The 10.5 mm
M12x1. 75 0.4724 12 ~ 15 1.75 The 10.2 mm
M12x0. 75 0.4724 12 ~ 34 0.75 The 11.25 mm
M12x1 0.4724 12 ~ 26 1 11 mm
25 M12x1. 0.4724 12 ~ 21 1.25 The 10.8 mm
2001/2/20 0.5 12.7 20 1.27 29/64 in
13 1/2 – 0.5 12.7 13 1.954 27/64 in
M14x1.5 0.5512 14 ~ 17 1.5 The 12.5 mm
25 M14x1. 0.5512 14 ~ 21 1.25 The 12.8 mm
M14x1 0.5512 14 ~ 26 1 13 mm
M14x2 0.5512 14 ~ 13 2 12 mm
9/16-18 0.5625 14.2875 18 1.411 33/64 in
9/16-12 0.5625 14.2875 12 2.117 31/64 in
M15x1 0.5906 15 ~ 26 1 14 mm
M15x1.5 0.5906 15 ~ 17 1.5 The 13.5 mm
2005/8/18 0.625 15.875 18 1.411 37/64 in
2005/8/11 0.625 15.875 11 2.309 17/32 in
M16x2 0.6299 16 ~ 13 2 14 mm
M16x1.5 0.6299 16 ~ 17 1.5 The 14.5 mm
M16x1 0.6299 16 ~ 26 1 15 mm
M17x1 0.6693 17 ~ 26 1 16 mm
M17x1.5 0.6693 17 ~ 17 1.5 The 15.5 mm
M18x2.5 0.7087 18 ~ 11 2.5 The 15.5 mm
M18x1 0.7087 18 ~ 26 1 17 mm
M18x1.5 0.7087 18 ~ 17 1.5 The 16.5 mm
M18x2 0.7087 18 ~ 13 2 16 mm
2003/4/16 0.75 19.05 16 1.588 11/16 in
2003/4/10 0.75 19.05 10 2.54 21/32 in
M20x2 0.7874 20 ~ 13 2 18 mm
M20x1.5 0.7874 20 ~ 17 1.5 The 18.5 mm
M20x1 0.7874 20 ~ 26 1 19 mm
M20x2.5 0.7874 20 ~ 11 2.5 The 17.5 mm
M22x2 0.8661 22 ~ 13 2 20 mm
M22x1.5 0.8661 22 ~ 17 1.5 The 20.5 mm
M22x1 0.8661 22 ~ 26 1 21 mm
M22x2.5 0.8661 22 ~ 11 2.5 The 19.5 mm
2007/8/9 0.875 22.225 9 2.822 49/64 in
2007/8/14 0.875 22.225 14 1.814 13/16 in
M24x3 0.9449 24 ~ 9 3 21 mm
M24x1 0.9449 24 ~ 26 1 23 mm
M24x1.5 0.9449 24 ~ 17 1.5 The 22.5 mm
M24x2 0.9449 24 ~ 13 2 22 mm
M25x2 0.9843 25 ~ 13 2 23 mm
M25x1 0.9843 25 ~ 26 1 24 mm
M25x1.5 0.9843 25 ~ 17 1.5 The 23.5 mm
1-14 1 25.4 14 1.814 15/16 in
1-8 1 25.4 8 3.175 7/8 in
M26x1.5 1.0236 26 ~ 17 1.5 The 24.5 mm
M27x1.5 1.063 27 ~ 17 1.5 The 25.5 mm
M27x3 1.063 27 ~ 9 3 24 mm
M27x1 1.063 27 ~ 26 1 26 mm
M27x2 1.063 27 ~ 13 2 25 mm
M28x2 1.1024 28 ~ 13 2 26 mm
M28x1 1.1024 28 ~ 26 1 27 mm
M28x1.5 1.1024 28 ~ 17 1.5 The 26.5 mm
1-12 1/8 1.125 28.575 12 2.117 1 3/64 in
1-7 1/8 1.125 28.575 7 3.629 63/64 in
M30x1.5 1.1811 30 ~ 17 1.5 The 28.5 mm
M30x3.5 1.1811 30 ~ 8 3.5 The 26.5 mm
M30x2 1.1811 30 ~ 13 2 28 mm
1 1/4-12 1.25 31.75 12 2.117 1 11/64 in
1 1/4-7 1.25 31.75 7 3.629 1 7/64 in
M33x2 1.2992 33 ~ 13 2 31 mm
M33x3.5 1.2992 33 ~ 8 3.5 The 29.5 mm
M36x3 1.4173 36 ~ 9 3 33 mm
M36x4 1.4173 36 ~ 7 4 32 mm
1 1/2-12 1.5 38.1 12 2.117 1 27/64 in
1 1/2-6 1.5 38.1 6 4.233 1 11/32 in
M39x4 1.5354 39 ~ 7 4 35 mm
M39x3 1.5354 39 ~ 9 3 36 mm
M42x4.5 1.6535 42 ~ 6 4.5 The 37.5 mm
1 3/4-12 1.75 44.45 12 2.117 1 43/64 in
1 3/4-5 1.75 44.45 5 5.08 1 35/64 in
M45x4.5 1.7717 45 ~ 6 4.5 The 40.5 mm
M48x5 1.8898 48 ~ 6 5 43 mm
2-12 2 50.8 12 2.117 1 59/64 in
2-4 1/2 2 50.8 4.5 5.644 1 25/32 in
M52x5 2.0472 52 ~ 6 5 47 mm
M56x5.5 2.2047 56 ~ 5 5.5 The 50.5 mm
M60x5.5 2.3622 60 ~ 5 5.5 The 54.5 mm
M64x6 2.5197 64 ~ 5 6 58 mm
M68x6 2.6772 68 ~ 5 6 62 mm

British coarse thread screw tap drill

The screw size
(External diameter – thread/inch) 		screws
Outside diameter 		Tap bit size
Is 75%. The diameter of 		Tap bit size
Is 50%. The diameter of
Lazy calculator
# 0-80 0.060 3/64 (. 0469) 55 (. 0520)
# 1-64 0.073 53 (. 0595) 1/16 (. 0625)
# 2-56 0.086 50 (. 0700) 49 (. 0730)
# 3-48 0.099 47 (. 0785) 44 (. 0860)
# 4-40 0.112 43 (. 0890) 41 (. 0960)
# 5-40 0.125 38 (. 1015) 7/64 (. 1094)
# 6-32 0.138 36 (. 1065) 32 (. 1160)
# 8-32 0.164 29 (. 1360) 27 (. 1440)
# 10 to 24 0.190 25 (. 1495) 20 (. 1610)
# 12 to 24 0.216 16 (. 1770) 12 (. 1890)
1/4 – 20 2500. 7 (. 2010) 7/32 (. 2188)
5/16-18 3125. F (.2570) J (.2770)
3/8-16 3750. 5/16 (. 3125) Q (.3320)
7/16-14 4375. U (.3680) 25/64 (. 3906)
13 1/2 – 5000. 27/64 (. 4219) 29/64 (. 4531)
9/16-12 5625. 31/64 (. 4844) 33/64 (.5156)
5/8-11 6250. 17/32 (.5312) 9/16 (.5625)
3/4-10 7500. 21/32 (. 6562) 11/16 (. 6875)
7/8-9 8750. 49/64 (. 7656) 51/64 (. 7969)
“1-8 1.000 7/8 (. 8750) 59/64 (. 9219)
1-7 1/8 1.1250 63/64 (. 9844) 1-1/32 (1.0313)

Source: Network Arrangement – China Pipe Fittings Manufacturer: www.epowermetals.com

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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