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This page provides tables listing sizes of inch and metric bolts, nuts, and washers. For information on bolted joints, see our bolted joint analysis reference.

Hardware Sizes: Unified Inch Screw Thread

This section contains tables of sizes for inch thread hardware.


Bolt Thread Sizes

The following table of thread sizes for coarse and fine thread was adapted from ASME B1.1:

Size Nominal (Major)
Diameter [in]
Coarse Thread (UNC) Fine Thread (UNF)
Threads
Per Inch
Tensile Stress
Area [in2]
Minor
Area [in2]
Threads
Per Inch
Tensile Stress
Area [in2]
Minor
Area [in2]
#0 0.0600 --- --- --- 80 0.00180 0.00151
#2 0.0860 56 0.00370 0.00310 64 0.00394 0.00339
#4 0.1120 40 0.00604 0.00496 48 0.00661 0.00566
#5 0.1250 40 0.00796 0.00672 44 0.00830 0.00716
#6 0.1380 32 0.00909 0.00745 40 0.01015 0.00874
#8 0.1640 32 0.0140 0.01196 36 0.01474 0.01285
#10 0.1900 24 0.0175 0.01450 32 0.0200 0.0175
1/4" 0.2500 20 0.0318 0.0269 28 0.0364 0.0326
5/16" 0.3125 18 0.0524 0.0454 24 0.0580 0.0524
3/8" 0.3750 16 0.0775 0.0678 24 0.0878 0.0809
7/16" 0.4375 14 0.1063 0.0933 20 0.1187 0.1090
1/2" 0.5000 13 0.1419 0.1257 20 0.1599 0.1486
9/16" 0.5625 12 0.182 0.162 18 0.203 0.189
5/8" 0.6250 11 0.226 0.202 18 0.256 0.240
3/4" 0.7500 10 0.334 0.302 16 0.373 0.351
7/8" 0.8750 9 0.462 0.419 14 0.509 0.480
1" 1.0000 8 0.606 0.551 12 0.663 0.625
1-1/8" 1.1250 7 0.763 0.693 12 0.856 0.812
1-1/4" 1.2500 7 0.969 0.890 12 1.073 1.024
1-3/8" 1.3750 6 1.155 1.054 12 1.315 1.260
1-1/2" 1.5000 6 1.405 1.294 12 1.581 1.521
1-3/4" 1.7500 5 1.90 1.74 --- --- ---
2" 2.0000 4.5 2.50 2.30 --- --- ---


Bolt Thread Dimensions

The following equations can be used to calculate dimensions for Unified Inch threads:

Equation, US Units [in] Source
Minor Diameter $$ d_{m.ext} = d_{nom} - {1.299038 \over TPI} $$ Machinery's Handbook
Pitch Diameter $$ d_{p.ext} = d_{nom} - {0.64951905 \over TPI} $$ ASME B1.1, Section 10.1p
Nominal Area $$ A_{nom} = {\pi \over 4} d_{nom}^2 $$
Tensile Stress Area $$ A_{t} = {\pi \over 4} \left( d_{nom} - {0.9743 \over TPI} \right)^2 $$ ASME B1.1, Appendix B
Minor Area
(Shear Area)
$$ A_{m} = {\pi \over 4} d_{m.ext}^2 $$

In the table above, \(d_{nom}\) is nominal diameter in inches and \(TPI\) is threads per inch.


Minimum Clearance Hole Diameters

The following table of clearance holes was adapted from ASME B18.2.8. The minimum hole diameters are given.

Bolt Size Bolt Dia. [in] Normal Fit [in] Close Fit [in] Loose Fit [in]
#0 0.0600 0.076 0.067 0.094
#2 0.0860 0.102 0.094 0.116
#4 0.1120 0.128 0.120 0.144
#5 0.1250 0.156 0.141 0.172
#6 0.1380 0.170 0.154 0.185
#8 0.1640 0.196 0.180 0.213
#10 0.1900 0.221 0.206 0.238
1/4" 0.2500 0.281 0.266 0.297
5/16" 0.3125 0.344 0.328 0.359
3/8" 0.3750 0.406 0.391 0.422
7/16" 0.4375 0.469 0.453 0.484
1/2" 0.5000 0.562 0.531 0.609
5/8" 0.6250 0.688 0.656 0.734
3/4" 0.7500 0.812 0.781 0.906
7/8" 0.8750 0.938 0.906 1.031
1" 1.0000 1.094 1.031 1.156
1-1/8" 1.1250 1.219 1.156 1.312
1-1/4" 1.2500 1.344 1.281 1.438
1-3/8" 1.3750 1.500 1.438 1.609
1-1/2" 1.5000 1.625 1.562 1.734


Bolt Thread Length

Per ASME B18.2.1, the nominal thread length of inch-series bolts can be found by:

$$ L_{thd} = \left| \begin{array}{ll} 2 d_{nom} + {1 \over 4} \text{ in} & L \le 6 \text{ in} \\ 2 d_{nom} + {1 \over 2} \text{ in} & L \gt 6 \text{ in} \end{array} \right. $$

where \(L\) is the total bolt length and \(d_{nom}\) is the nominal bolt diameter.


Hex Bolt Head Dimensions

The following table of hex bolt head dimensions was adapted from ASME B18.6.3, Table 29, "Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws." This table is used for smaller size hardware.

Size Nominal (Major)
Diameter [in]
Width Across Flats Head Height
Minimum [in] Maximum [in] Minimum [in] Maximum [in]
#2 0.0860 0.120 0.125 0.040 0.050
#4 0.1120 0.181 0.188 0.049 0.060
#6 0.1380 0.244 0.250 0.080 0.093
#8 0.1640 0.244 0.250 0.096 0.110
#10 0.1900 0.305 0.312 0.105 0.120
1/4" 0.2500 0.367 0.375 0.172 0.190
5/16" 0.3125 0.489 0.500 0.208 0.230
3/8" 0.3750 0.551 0.562 0.270 0.295


The following table of hex bolt head dimensions was adapted from ASME B18.2.1, Table 2, "Dimensions of Hex Bolts."

Size Nominal (Major)
Diameter [in]
Width Across Flats Head Height
Nominal [in] Minimum [in] Nominal [in] Minimum [in]
1/4" 0.2500 7/16"(0.438) 0.425 11/64" 0.150
5/16" 0.3125 1/2"(0.500) 0.484 7/32" 0.195
3/8" 0.3750 9/16"(0.562) 0.544 1/4" 0.226
7/16" 0.4375 5/8"(0.625) 0.603 19/64" 0.272
1/2" 0.5000 3/4"(0.750) 0.725 11/32" 0.302
5/8" 0.6250 15/16"(0.938) 0.906 27/64" 0.378
3/4" 0.7500 1-1/8"(1.125) 1.088 1/2" 0.455
7/8" 0.8750 1-5/16"(1.312) 1.269 37/64" 0.531
1" 1.0000 1-1/2"(1.500) 1.450 43/64" 0.591
1-1/8" 1.1250 1-11/16"(1.688) 1.631 3/4" 0.658
1-1/4" 1.2500 1-7/8"(1.875) 1.812 27/32" 0.749
1-3/8" 1.3750 2-1/16"(2.062) 1.994 29/32" 0.810
1-1/2" 1.5000 2-1/4"(2.250) 2.175 1" 0.902
1-5/8" 1.6250 2-7/16"(2.438) 2.356 1-3/32" 0.978
1-3/4" 1.7500 2-5/8"(2.625) 2.538 1-5/32" 1.054
1-7/8" 1.8750 2-13/16"(2.812) 2.719 1-1/4" 1.130
2" 2.0000 3"(3.000) 2.900 1-11/32" 1.175


Hex Nut Dimensions

The following table of hex nut dimensions was adapted from ASME B18.2.2, Table 1-1, "Dimensions of Square and Hex Machine Screw Nuts." This table is used for smaller size hardware.

Size Nominal (Major)
Diameter [in]
Width Across Flats Thickness
Nominal [in] Minimum [in] Minimum [in] Maximum [in]
#0 0.060 5/32"(0.156) 0.150 0.043 0.050
#2 0.086 3/16"(0.188) 0.180 0.057 0.066
#4 0.112 1/4"(0.250) 0.241 0.087 0.098
#6 0.138 5/16"(0.312) 0.302 0.102 0.114
#8 0.164 11/32"(0.344) 0.332 0.117 0.130
#10 0.190 3/8"(0.375) 0.362 0.117 0.130
1/4" 0.250 7/16"(0.438) 0.423 0.178 0.193
5/16" 0.312 9/16"(0.562) 0.545 0.208 0.225
3/8" 0.375 5/8"(0.625) 0.607 0.239 0.257


The following table of hex nut dimensions was adapted from ASME B18.2.2, Table 4, "Dimensions of Hex Nuts and Hex Jam Nuts."

Size Nominal (Major)
Diameter [in]
Width Across Flats Thickness
Minimum [in] Maximum [in] Minimum [in] Maximum [in]
1/4" 0.2500 0.428 0.438 0.212 0.226
5/16" 0.3125 0.489 0.500 0.258 0.273
3/8" 0.3750 0.551 0.563 0.320 0.337
7/16" 0.4375 0.675 0.688 0.365 0.385
1/2" 0.5000 0.736 0.750 0.427 0.448
9/16" 0.5625 0.861 0.875 0.473 0.496
5/8" 0.6250 0.922 0.938 0.535 0.559
3/4" 0.7500 1.088 1.125 0.617 0.665
7/8" 0.8750 1.269 1.312 0.724 0.776
1" 1.0000 1.450 1.500 0.831 0.887
1-1/8" 1.1250 1.631 1.688 0.939 0.999
1-1/4" 1.2500 1.812 1.875 1.030 1.094
1-3/8" 1.3750 1.994 2.062 1.138 1.206
1-1/2" 1.5000 2.175 2.250 1.245 1.317
1-5/8" 1.6250 2.350 2.430 1.364 1.416
1-3/4" 1.7500 2.538 2.625 1.460 1.540
1-7/8" 1.8750 2.722 2.813 1.567 1.651
2" 2.0000 2.900 3.000 1.675 1.763


Internal Thread Dimensions

The following equations can be used to calculate internal thread dimensions for Unified Inch threads:

Equation, US Units [in] Source
Minor Diameter $$ d_{m.int} = d_{nom} - {1.08253175 \over TPI} $$ ASME B1.1, Section 10.1s
Pitch Diameter $$ d_{p.int} = d_{nom} - {0.64951905 \over TPI} $$ ASME B1.1, Section 8.3

In the table above, \(d_{nom}\) is nominal diameter in inches and \(TPI\) is threads per inch.


Flat Washer Dimensions

The following table of flat washer dimensions was adapted from ASME B18.21.1, Table 11 for Type A Plain Washers. Type A washers come in 2 series: Narrow and Wide.

Size Basic Dia. [in] Series Inner Dia,
Basic [in]
Outer Dia,
Basic [in]
Thickness,
Basic [in]
#0 0.0600 --- 0.078 0.188 0.020
#2 0.0860 --- 0.094 0.250 0.020
#4 0.1120 --- 0.125 0.312 0.032
#6 0.1380 --- 0.156 0.375 0.049
#8 0.1640 --- 0.188 0.438 0.049
#10 0.1900 --- 0.219 0.500 0.049
1/4" 0.2500 Narrow 0.281 0.625 0.065
1/4" 0.2500 Wide 0.312 0.734 0.065
5/16" 0.3125 Narrow 0.344 0.688 0.065
5/16" 0.3125 Wide 0.375 0.875 0.083
3/8" 0.3750 Narrow 0.406 0.812 0.065
3/8" 0.3750 Wide 0.438 1.000 0.083
7/16" 0.4375 Narrow 0.469 0.922 0.065
7/16" 0.4375 Wide 0.500 1.250 0.083
1/2" 0.5000 Narrow 0.531 1.062 0.095
1/2" 0.5000 Wide 0.562 1.375 0.109
9/16" 0.5625 Narrow 0.594 1.156 0.095
9/16" 0.5625 Wide 0.625 1.469 0.109
5/8" 0.6250 Narrow 0.656 1.312 0.095
5/8" 0.6250 Wide 0.688 1.750 0.134
3/4" 0.7500 Narrow 0.812 1.469 0.134
3/4" 0.7500 Wide 0.812 2.000 0.148
7/8" 0.8750 Narrow 0.938 1.750 0.134
7/8" 0.8750 Wide 0.938 2.250 0.165
1" 1.0000 Narrow 1.062 2.000 0.134
1" 1.0000 Wide 1.062 2.500 0.165
1-1/8" 1.1250 Narrow 1.250 2.250 0.134
1-1/8" 1.1250 Wide 1.250 2.750 0.165
1-1/4" 1.2500 Narrow 1.375 2.500 0.165
1-1/4" 1.2500 Wide 1.375 3.000 0.165
1-3/8" 1.3750 Narrow 1.500 2.750 0.165
1-3/8" 1.3750 Wide 1.500 3.250 0.180
1-1/2" 1.5000 Narrow 1.625 3.000 0.165
1-1/2" 1.5000 Wide 1.625 3.500 0.180
1-5/8" 1.6250 --- 1.750 3.750 0.180
1-3/4" 1.7500 --- 1.875 4.000 0.180
1-7/8" 1.8750 --- 2.000 4.250 0.180
2" 2.0000 --- 2.125 4.500 0.180



Hardware Sizes: Metric Screw Thread

This section contains tables of sizes for metric thread hardware.


Bolt Thread Sizes

The following table of thread sizes for coarse and fine pitch thread was created using the standard sizes from ASME B1.13M. Coarse pitch threads are preferred and should be used whenever possible, as stated in ASME B1.13M. The thread equations given previously for tensile stress area and for minor area were used in constructing the table.

The thread size designation for metric thread is given as "M[dia] x [pitch]". For example, a thread with a nominal diameter of 6 mm and a pitch of 1 mm is designated as "M6 x 1."

Nominal (Major)
Diameter [mm]
Coarse Pitch Fine Pitch
Pitch
[mm]
Tensile Stress
Area [mm2]
Minor
Area [mm2]
Pitch
[mm]
Tensile Stress
Area [mm2]
Minor
Area [mm2]
1.6 0.35 1.270 1.076 --- --- ---
2 0.4 2.073 1.789 --- --- ---
2.5 0.45 3.391 2.980 --- --- ---
3 0.5 5.031 4.473 --- --- ---
3.5 0.6 6.775 6.000 --- --- ---
4 0.7 8.779 7.750 --- --- ---
5 0.8 14.18 12.68 --- --- ---
6 1 20.12 17.89 --- --- ---
8 1.25 36.61 32.84 1 39.17 36.03
10 1.5 57.99 52.29 1.25 61.20 56.30
12 1.75 84.27 76.25 1.25 92.07 86.04
14 2 115.4 104.7 1.5 124.5 116.1
16 2 156.7 144.1 1.5 167.2 157.5
20 2.5 244.8 225.2 1.5 271.5 259.0
24 3 352.5 324.3 2 384.4 364.6
30 3.5 560.6 519.0 2 621.2 596.0
36 4 816.7 759.3 2 914.5 883.8
42 4.5 1121 1045 2 1264 1228
48 5 1473 1377 2 1671 1629
56 5.5 2030 1905 2 2301 2252
64 6 2676 2520 2 3031 2975
72 6 3460 3282 2 3862 3799
80 6 4344 4144 1.5 4851 4798
90 6 5591 5364 2 6099 6020
100 6 6995 6740 2 7562 7473
110 --- --- --- 2 9182 9084


Bolt Thread Dimensions

The following equations can be used to calculate dimensions for ISO metric threads. The thread profile is based on a parameter \(H\), the height of the fundamental triangle. The value of \(H\) is related to the thread pitch, \(P\) by:

$$ H = { \sqrt{3} \over 2 } P $$
Equation, Metric Units [mm] Source
Minor Diameter $$ d_{m.ext} = d_{nom} - 1.226869 P $$ Shigley
Pitch Diameter $$ d_{p.ext} = d_{nom} - 0.75 H = d_{nom} - 0.64951905 P $$ Machinery's Handbook
Nominal Area $$ A_{nom} = {\pi \over 4} d_{nom}^2 $$
Tensile Stress Area $$ A_{t} = {\pi \over 4} \left( d_{nom} - 0.9382 P \right)^2 $$ ASME B1.13M, Appendix B
Minor Area
(Shear Area)
$$ A_{m} = {\pi \over 4} d_{m.ext}^2 $$

In the table above, \(d_{nom}\) is nominal diameter in millimeters and \(P\) is the thread pitch in millimeters.


Minimum Clearance Hole Diameters

The following table of clearance holes was adapted from ASME B18.2.8. The minimum hole diameters are given. This table also matches the table of recommended clearance holes from ASME B18.2.3.1M.

Bolt Size Normal Fit [mm] Close Fit [mm] Loose Fit [mm]
M1.6 1.8 1.7 2
M2 2.4 2.2 2.6
M2.5 2.9 2.7 3.1
M3 3.4 3.2 3.6
M4 4.5 4.3 4.8
M5 5.5 5.3 5.8
M6 6.6 6.4 7
M8 9 8.4 10
M10 11 10.5 12
M12 13.5 13 14.5
M14 15.5 15 16.5
M16 17.5 17 18.5
M20 22 21 24
M24 26 25 28
M30 33 31 35
M36 39 37 42
M42 45 43 48
M48 52 50 56
M56 62 58 66
M64 70 66 74
M72 78 74 82
M80 86 82 91
M90 96 93 101
M100 107 104 112


Bolt Thread Length

Per ASME B18.2.3.1M, Table 7, "Thread Lengths," the nominal thread length of metric bolts can be found by:

$$ L_{thd} = \left| \begin{array}{ll} 2 d_{nom} + 6 \text{ mm} & L \le 125 \text{ mm}, & d_{nom} \le 30 \text{ mm} \\ 2 d_{nom} + 12 \text{ mm} & 125 \lt L \le 200 \text{ mm}, & d_{nom} \le 48 \text{ mm} \\ 2 d_{nom} + 25 \text{ mm} & L \gt 200 \text{ mm} \end{array} \right. $$

where \(L\) is the total bolt length and \(d_{nom}\) is the nominal bolt diameter.


Hex Bolt Head Dimensions

The following table of hex bolt head dimensions was adapted from ASME B18.6.7M, Table 14, "Dimensions of Hex Head Machine Screws." This table is used for smaller size hardware.

Nominal Diameter
and Thread Pitch
Width Across Flats Head Height
Minimum [mm] Maximum [mm] Minimum [mm] Maximum [mm]
M2 x 0.4 3.02 3.20 1.3 1.6
M2.5 x 0.45 3.82 4.00 1.8 2.1
M3 x 0.5 4.82 5.00 2.0 2.3
M3.5 x 0.6 5.32 5.50 2.3 2.6
M4 x 0.7 6.78 7.00 2.6 3.0
M5 x 0.8 7.78 8.00 3.3 3.8
M6 x 1 9.78 10.00 4.1 4.7
M8 x 1.25 12.73 13.00 5.2 6.0
M10 x 1.5 15.73 16.00 6.5 7.5
M12 x 1.75 17.73 18.00 7.8 9.0


The following table of hex bolt head dimensions was adapted from ASME B18.2.3.1M, Table 3, "Dimensions of Hex Cap Screws."

Nominal Diameter
and Thread Pitch
Width Across Flats Head Height
Minimum [mm] Maximum [mm] Minimum [mm] Maximum [mm]
M5 x 0.8 7.78 8.00 3.35 3.65
M6 x 1 9.78 10 3.85 4.15
M8 x 1.25 12.73 13.00 5.10 5.50
M10 x 1.5 15.73 16.00 6.17 6.63
M12 x 1.75 17.73 18.00 7.24 7.76
M14 x 2 20.67 21.00 8.51 9.09
M16 x 2 23.67 24.00 9.68 10.32
M20 x 2.5 29.16 30.00 12.12 12.88
M24 x 3 35.00 36.00 14.46 15.44
M30 x 3.5 45.00 46.00 17.92 19.48
M36 x 4 53.80 55.00 21.62 23.38
M42 x 4.5 62.90 65.00 25.03 26.97
M48 x 5 72.60 75.00 28.93 31.07
M56 x 5.5 82.20 85.00 33.80 36.20
M64 x 6 91.80 95.00 38.68 41.32
M72 x 6 101.40 105.00 43.55 46.45
M80 x 6 111.00 115.00 48.42 51.58
M90 x 6 125.50 130.00 54.26 57.75
M100 x 6 140.00 145.00 60.10 63.90


Hex Nut Dimensions

The following table of hex nut dimensions was adapted from ASME B18.2.4.1M, Table 1, "Dimensions of Hex Nuts, Style 1." For further reference, also see ASME B18.2.4.2M, Table 1, "Dimensions of Hex Nuts, Style 2.".

Nominal Diameter
and Thread Pitch
Width Across Flats Thickness
Minimum [mm] Maximum [mm] Minimum [mm] Maximum [mm]
M1.6 x 0.35 3.02 3.20 1.05 1.30
M2 x 0.4 3.82 4.00 1.35 1.60
M2.5 x 0.45 4.82 5.00 1.75 2.00
M3 x 0.5 5.32 5.50 2.15 2.40
M3.5 x 0.6 5.82 6.00 2.55 2.80
M4 x 0.7 6.78 7.00 2.90 3.20
M5 x 0.8 7.78 8.00 4.40 4.70
M6 x 1 9.78 10.00 4.90 5.20
M8 x 1.25 12.73 13.00 6.44 6.80
M10 x 1.5 15.73 16.00 8.04 8.40
M12 x 1.75 17.73 18.00 10.37 10.80
M14 x 2 20.67 21.00 12.10 12.80
M16 x 2 23.67 24.00 14.10 14.80
M20 x 2.5 29.16 30.00 16.90 18.00
M24 x 3 35.00 36.00 20.20 21.50
M30 x 3.5 45.00 46.00 24.30 25.60
M36 x 4 53.80 55.00 29.40 31.00


Internal Thread Dimensions

The following equations can be used to calculate internal thread dimensions for ISO metric threads:

Equation, Metric Units [mm] Source
Minor Diameter $$ d_{m.int} = d_{nom} - 1.25 H = d_{nom} - 1.08253175 P $$ Machinery's Handbook
Pitch Diameter $$ d_{p.ext} = d_{nom} - 0.75 H = d_{nom} - 0.64951905 P $$ Machinery's Handbook

In the table above, \(d_{nom}\) is nominal diameter in millimeters and \(P\) is the thread pitch in millimeters.


Flat Washer Dimensions

The following table of flat washer dimensions was adapted from ASME B18.22M, Table 1, "Dimensions of Metric Plain Washers (General Purpose)." Plain washers come in 3 series: Regular, Narrow, and Wide.

Nominal Size Series Inner Diameter Outer Diameter Thickness
Min [mm] Max [mm] Min [mm] Max [mm] Min [mm] Max [mm]
M1.6 Narrow 1.95 2.09 3.70 4.00 0.50 0.70
M1.6 Regular 1.95 2.09 4.70 5.00 0.50 0.70
M1.6 Wide 1.95 2.09 5.70 6.00 0.60 0.90
M2 Narrow 2.50 2.64 4.70 5.00 0.60 0.90
M2 Regular 2.50 2.64 5.70 6.00 0.60 0.90
M2 Wide 2.50 2.64 7.64 8.00 0.60 0.90
M2.5 Narrow 3.00 3.14 5.70 6.00 0.60 0.90
M2.5 Regular 3.00 3.14 7.64 8.00 0.60 0.90
M2.5 Wide 3.00 3.14 9.64 10.00 0.80 1.20
M3 Narrow 3.50 3.68 6.64 7.00 0.60 0.90
M3 Regular 3.50 3.68 9.64 10.00 0.80 1.20
M3 Wide 3.50 3.68 11.57 12.00 1.00 1.40
M3.5 Narrow 4.00 4.18 8.64 9.00 0.80 1.20
M3.5 Regular 4.00 4.18 9.64 10.00 1.00 1.40
M3.5 Wide 4.00 4.18 14.57 15.00 1.20 1.75
M4 Narrow 4.70 4.88 9.64 10.00 0.80 1.20
M4 Regular 4.70 4.88 11.57 12.00 1.00 1.40
M4 Wide 4.70 4.88 15.57 16.00 1.60 2.30
M5 Narrow 5.60 5.78 10.57 11.00 1.00 1.40
M5 Regular 5.60 5.78 14.57 15.00 1.20 1.75
M5 Wide 5.60 5.78 19.48 20.00 1.60 2.30
M6 Narrow 6.65 6.87 12.57 13.00 1.20 1.75
M6 Regular 6.65 6.87 18.28 18.80 1.20 1.75
M6 Wide 6.65 6.87 24.88 25.40 1.60 2.30
M8 Narrow 8.90 9.12 18.28 18.80 1.60 2.30
M8 Regular 8.90 9.12 24.88 25.40 1.60 2.30
M8 Wide 8.90 9.12 31.38 32.00 2.00 2.80
M10 Narrow 10.85 11.12 19.48 20.00 1.60 2.30
M10 Regular 10.85 11.12 27.48 28.00 2.00 2.80
M10 Wide 10.85 11.12 38.38 39.00 2.50 3.50
M12 Narrow 13.30 13.57 24.88 25.40 2.00 2.80
M12 Regular 13.30 13.57 33.38 34.00 2.50 3.50
M12 Wide 13.30 13.57 43.38 44.00 2.50 3.50
M14 Narrow 15.25 15.52 27.48 28.00 2.00 2.80
M14 Regular 15.25 15.52 38.38 39.00 2.50 3.50
M14 Wide 15.25 15.52 49.38 50.00 3.00 4.00
M16 Narrow 17.25 17.52 31.38 32.00 2.50 3.50
M16 Regular 17.25 17.52 43.38 44.00 3.00 4.00
M16 Wide 17.25 17.68 54.80 56.00 3.50 4.60
M20 Narrow 21.80 22.13 38.38 39.00 3.00 4.00
M20 Regular 21.80 22.32 49.00 50.00 3.50 4.60
M20 Wide 21.80 22.32 64.80 66.00 4.00 5.10
M24 Narrow 25.60 26.12 43.00 44.00 3.50 4.60
M24 Regular 25.60 26.12 54.80 56.00 4.00 5.10
M24 Wide 25.60 26.12 70.80 72.00 4.50 5.60
M30 Narrow 32.40 33.02 54.80 56.00 4.00 5.10
M30 Regular 32.40 33.02 70.80 72.00 4.50 5.60
M30 Wide 32.40 33.02 88.60 90.00 5.00 6.40
M36 Narrow 38.30 38.92 64.80 66.00 4.50 5.60
M36 Regular 38.30 38.92 88.60 90.00 5.00 6.40
M36 Wide 38.30 38.92 108.60 110.00 7.00 8.50



References

General References:

  1. Barrett, Richard T., "Fastener Design Manual," NASA Reference Publication 1228, 1990.
  2. Budynas-Nisbett, "Shigley's Mechanical Engineering Design," 8th Ed.
  3. Machinery's Handbook, 27th Ed., Industrial Press Inc., 2004.
  4. Lindeburg, Michael R., "Mechanical Engineering Reference Manual for the PE Exam," 13th Ed.

Specifications and Standards:

  1. ASME B1.1, "Unified Inch Screw Threads (UN and UNR Thread Form)," The American Society of Mechanical Engineers, 2003.
  2. ASME B18.2.1, "Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)," The American Society of Mechanical Engineers, 2012.
  3. ASME B18.2.2, "Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)," The American Society of Mechanical Engineers, 2010.
  4. ASME B18.2.8, "Clearance Holes for Bolts, Screws, and Studs," The American Society of Mechanical Engineers, 1999.
  5. ASME B18.21.1, "Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)," The American Society of Mechanical Engineers, 2009.
  6. FED-STD-H28/2B, "Screw-Thread Standards for Federal Services," Federal Standard, 1991.