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Steel Nuts for Stud Bolts (ASTM A194)

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Hexagonal steel nuts for stud bolts charts: dimensions (nuts width and thickness), weight (in kilograms and pounds), material specifications ASTM A194 and metric grades.

STEEL NUTS SIZES

Nuts width and thickness

 

Heavy Hex Nuts Dimensions ASME B18.2.2
Heavy Hex Nuts Dimensions ASME B18.2.2
HEAVY HEX NUTS DIAMETER (inches) Width
Across Flats		 Width
Across Corners
F C
Basic Max Min Max Min
1/2 7/8 0.875 0.850 1.010 0.969
5/8 1.1/16 1.062 1.031 1.227 1.175
3/4 1.1/4 1.250 1.212 1.443 1.382
7/8 1.7/16 1.438 1.394 1.660 1.589
1 1.5/8 1.625 1.575 1.876 1.796
1⅛ 1.13/16 1.812 1.756 2.093 2.002
1¼ 2 2.000 1.938 2.309 2.209
1⅜ 2.3/16 2.188 2.119 2.526 2.416
1½ 2.3/8 2.375 2.300 2.742 2.622
1⅝ 2.9/16 2.562 2.481 2.959 2.828
1¾ 2.3/4 2.750 2.662 3.175 3.035
1⅞ 2.15/16 2.938 2.844 3.392 3.242
2 3.1/8 3.125 3.025 3.608 3.449
2¼ 3.1/2 3.500 3.388 4.041 3.862
2½ 3.7/8 3.875 3.750 4.474 4.275
2¾ 4.1/4 4.250 4.112 4.907 4.688
3 4.5/8 4.625 4.475 5.340 5.102
3¼ 5 5.000 4.838 5.774 5.515
3½ 5.3/8 5.375 5.200 6.207 5.928
3¾ 5.3/4 5.750 5.562 6.640 6.341
4 6.1/8 6.125 5.925 7.073 6.755

 

Heavy Hex Nuts Dimensions ASME B18.2.2
Heavy Hex Nuts Dimensions ASME B18.2.2
HEAVY HEX NUT DIAMETER (inches) Hex Heavy Nut Thickness
Basic Max Min
1/2 31/64 0.504 0.464
5/8 39/64 0.631 0.587
3/4 47/64 0.758 0.710
7/8 55/64 0.885 0.833
1 63/64 1.012 0.956
1⅛ 1.7/64 1.139 1.079
1¼ 1.7/32 1.251 1.187
1⅜ 1.11/32 1.378 1.310
1½ 1.15/32 1.505 1.433
1⅝ 1.19/32 1.632 1.556
1¾ 1.23/32 1.759 1.679
1⅞ 1.27/32 1.886 1.802
2 1.31/32 2.013 1.925
2¼ 2.13/64 2.251 2.155
2½ 2.29/64 2.505 2.401
2¾ 2.45/64 2.759 2.647
3 2.61/64 3.013 2.893
3¼ 3.3/16 3.252 3.124
3½ 3.7/16 3.506 3.370
3¾ 3.11/16 3.760 3.616
4 3.15/16 4.014 3.862

STEEL NUTS WEIGHT

Steel Nuts Weight in Pounds

Heavy Hex Nuts Diameter Finished Hex Heavy Hex Finished Jam Heavy Hex Jam Square Heavy Square
1/2″ 3.75 6.54 2.62 4 5.78 7.87
5/8″ 7.33 11.9 4.93 6.96 10.8 14.3
3/4″ 11.9 19.3 7.7 11 15.4 23.5
7/8″ 19 29.7 12 16.7 24.5 36.2
1″ 28.3 42.5 17.6 23.5 36.3 51.5
1-1/8″ 40.3 59.2 24.7 32.4 52.5 72.4
1-1/4″ 54.3 78.6 36.1 45.8 70.6 95.5
1-3/8″ 73 102 47.9 59.3 94.5 125
1-1/2″ 94.3 131 60.9 74.8 122 161
1-5/8″ 162 91.6
1-3/4″ 151 204 100 114
1-7/8″ 241 134
2″ 224 299 140 165
2-1/4″ 419 227
2-1/2″ 564 332
2-3/4″ 738 429
3″ 950 545
3-1/4″ 1194 651
3-1/2″ 1526 851
3-3/4″ 1812 1005
4″ 2180 1200

The weight of heavy hexagonal steel nuts for stud bolts in lbs / 100 units – ASME B18.2.2

Steel Nuts Weight in Kilograms

Heavy Hex Nuts Diameter Finished Hex Heavy Hex Finished Jam Heavy Hex Jam Square Heavy Square
1/2″ 1.70 2.97 1.19 1.81 2.62 3.57
5/8″ 3.32 5.40 2.24 3.16 4.90 6.49
3/4″ 5.40 8.75 3.49 4.99 6.98 10.66
7/8″ 8.62 13.47 5.44 7.57 11.11 16.42
1″ 12.83 19.27 7.98 10.66 16.46 23.36
1-1/8″ 18.28 26.85 11.20 14.69 23.81 32.83
1-1/4″ 24.63 35.65 16.37 20.77 32.02 43.31
1-3/8″ 33.11 46.26 21.72 26.89 42.86 56.69
1-1/2″ 42.77 59.41 27.62 33.92 55.33 73.01
1-5/8″ 0.00 73.47 0.00 41.54
1-3/4″ 68.48 92.51 45.35 51.70
1-7/8″ 0.00 109.29 0.00 60.77 0.00
2″ 101.58 135.60 63.49 74.83 0.00
2-1/4″ 190.02 0.00 102.94 0.00
2-1/2″ 255.77 0.00 150.56 0.00
2-3/4″ 334.68 0.00 194.55 0.00
3″ 430.83 0.00 247.16 0.00
3-1/4″ 541.48 0.00 295.23 0.00
3-1/2″ 692.04 0.00 385.93 0.00
3-3/4″ 821.74 0.00 455.77 0.00
4″ 988.63 0.00 544.20
The weight of heavy hexagonal steel nuts for stud bolts in kilograms / 100 units – ASME B18.2.2

Bolts and Nuts Weight in Kilograms

Heavy Hex Nuts Diameter (Metric) Bolt Weight (kg) Nut Weight (kg) Total Weight (kg)
M12 x 35 0.049 0.013 0.062
M12 x 40 0.053 0.013 0.066
M12 x 45 0.058 0.013 0.071
M12 x 50 0.062 0.013 0.075
M12 x 55 0.067 0.013 0.080
M12 x 60 0.071 0.013 0.084
M12 x 65 0.072 0.013 0.085
M12 x 70 0.080 0.013 0.093
M12 x 75 0.085 0.013 0.098
M12 x 80 0.089 0.013 0.102
M12 x 85 0.094 0.013 0.107
M12 x 90 0.098 0.013 0.111
M12 x 95 0.103 0.013 0.116
M12 x 100 0.107 0.013 0.120
M12 x 105 0.111 0.013 0.124
M12 x 110 0.116 0.013 0.129
M 16X35 0.087 0.032 0.119
M 16X40 0.094 0.032 0.126
M 16X45 0.102 0.032 0.134
M 16X50 0.110 0.032 0.142
M 16X55 0.118 0.032 0.150
M 16X60 0.126 0.032 0.158
M 16X65 0.132 0.032 0.164
M 16X70 0.141 0.032 0.173
M 16X75 0.148 0.032 0.180
M 16X80 0.153 0.032 0.185
M 16X85 0.161 0.032 0.193
M 16X90 0.167 0.032 0.199
M 16X95 0.177 0.032 0.209
M 16X100 0.186 0.032 0.218
M 16X105 0.195 0.032 0.227
M 16X110 0.203 0.032 0.235
M 16X115 0.211 0.032 0.243
M 16X120 0.220 0.032 0.252
M 16X125 0.228 0.032 0.260
M 16X130 0.235 0.032 0.267
M 16X135 0.243 0.032 0.275
M 16X140 0.251 0.032 0.283
M 16X145 0.259 0.032 0.291
M 16X150 0.267 0.032 0.299
M 16X155 0.270 0.032 0.302
M 16X160 0.278 0.032 0.310
M 16X165 0.286 0.032 0.318
M 16X170 0.294 0.032 0.326
M 16X175 0.302 0.032 0.334
M 16X180 0.310 0.032 0.342
M 16X185 0.318 0.032 0.350
M 16X190 0.326 0.032 0.358
M 16X195 0.334 0.032 0.366
M 16X200 0.342 0.032 0.374
M 20X45 0.173 0.061 0.234
M 20X50 0.186 0.061 0.247
M 20X55 0.198 0.061 0.259
M 20X60 0.211 0.061 0.272
M 20X65 0.223 0.061 0.284
M 20X70 0.235 0.061 0.296
M 20X75 0.248 0.061 0.309
M 20X80 0.260 0.061 0.321
M 20X85 0.273 0.061 0.334
M 20X90 0.285 0.061 0.346
M 20X95 0.297 0.061 0.358
M 20X100 0.310 0.061 0.371
M 20X105 0.322 0.061 0.383
M 20X110 0.334 0.061 0.395
M 20X115 0.346 0.061 0.407
M 20X120 0.359 0.061 0.420
M 20X125 0.371 0.061 0.432
M 20X130 0.384 0.061 0.445
M 20X135 0.396 0.061 0.457
M 20X140 0.408 0.061 0.469
M 20X145 0.421 0.061 0.482
M 20X150 0.433 0.061 0.494
M 20X155 0.445 0.061 0.506
M 20X160 0.458 0.061 0.519
M 20X165 0.470 0.061 0.531
M 20X170 0.482 0.061 0.543
M 20X175 0.495 0.061 0.556
M 20X180 0.506 0.061 0.445
M 20X185 0.518 0.061 0.457
M 20X190 0.530 0.061 0.469
M 20X195 0.542 0.061 0.481
M 20X200 0.554 0.061 0.493
M 24X45 0.258 0.104 0.362
M 24X50 0.276 0.104 0.380
M 24X55 0.294 0.104 0.398
M 24X60 0.312 0.104 0.416
M 24X65 0.330 0.104 0.434
M 24X70 0.348 0.104 0.452
M 24X75 0.366 0.104 0.470
M 24X80 0.384 0.104 0.488
M 24X85 0.402 0.104 0.506
M 24X90 0.420 0.104 0.524
M 24X95 0.437 0.104 0.541
M 24X100 0.456 0.104 0.560
M 24X105 0.471 0.104 0.575
M 24X110 0.492 0.104 0.596
M 24X115 0.510 0.104 0.614
M 24X120 0.528 0.104 0.632
M 24X125 0.546 0.104 0.650
M 24X130 0.559 0.104 0.663
M 24X135 0.582 0.104 0.686
M 24X140 0.598 0.104 0.702
M 24X145 0.618 0.104 0.722
M 24X150 0.638 0.104 0.742
M 24X155 0.656 0.104 0.760
M 24X160 0.674 0.104 0.778
M 24X165 0.688 0.104 0.792
M 24X170 0.709 0.104 0.813
M 24X175 0.727 0.104 0.831
M 24X180 0.745 0.104 0.849
M 24X185 0.762 0.104 0.866
M 24X190 0.78 0.104 0.884
M 24X195 0.798 0.104 0.902
M 24X200 0.816 0.104 0.920

STEEL NUTS MATERIALS

ASTM A194

The ASTM A194 specification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. Hex heavy nuts are components of boltings sets for flanges.

These nuts are intended for high-pressure or high-temperature service or both. Bars from which the nuts are made shall be hot-wrought.

According to the ASTM A194 norm, the material may be further processed by centerless grinding or by cold drawing.

Austenitic stainless steel may be solution annealed or annealed and strain-hardened. Each alloy shall conform to the chemical composition requirements prescribed.

Hardness tests, proof of load tests, and cone proof load tests shall be made to all nuts to meet the requirements specified.

ASTM A194 stated in either inch-pound units or SI units are to be regarded separately as standard.
The values stated in each system are not exact equivalents; therefore, each system must be used independently by the other. Combining values from the two systems may result in a non-conformity with the specification of the ASTM A194 norm.
Within the text, the SI units are shown in brackets. ASTM A194  covers the size from 1/4 inch. through 4 inches. and the metric sizes between M6 and M100 nominal diameter. It also covers austenitic stainless steel nuts in the size range 1/4 inch. and M6 nominal and upper.
Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used for the threading of the nuts. Heavy hex nuts > =  1 inch. nominal size shall be UNC Series Class 2B fit.
Nuts over 1 inch. nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are the most common type of steel nuts used in combination with A193 B7 stud bolts.
The most common grades of ASTM A194 heavy hex steel nuts are:
  • ASTM A194 2H: Quenched & tempered carbon steel heavy hex nuts
  • ASTM A194 2HM: Quenched & tempered carbon steel heavy hex nuts
  • ASTM A194 4: Quenched & tempered carbon-molybdenum heavy hex nuts
  • ASTM A194 3
  • ASTM A194 6
  • ASTM A194 7: Quenched & tempered alloy steel heavy hex nuts
  • ASTM A194 7M: Quenched & tempered alloy steel heavy hex nuts
  • ASTM A194 8: Stainless AISI 304 heavy hex nuts
  • ASTM A194 8A
  • ASTM A194 8M: Stainless AISI 316 heavy hex nuts
  • ASTM A194 8MA
  • ASTM A194 8C
  • ASTM A194 8T

ASTM A194 Chemical Composition

ASTM A194 NUTS Carbon Manganese Phosphorous, max Sulfur, max Silicon Chromium Nickel Molybdenum Other Elements
ASTM A194 grade 2, 2H and 2 HM 0.40% min. 1.00% max. 0.04% 0.05% 0.40% max
ASTM A194 grade 3 0.10% min. 1.00% max. 0.04% 0.03% 1.00% 4.0-6.0% 0.20-0.30%
ASTM A194 grade 4 0.40 -0.50% 0.70-0.90% 0.035% 0.04% 0.15-0.35% 0.20-0.30%
ASTM A194 grade 6 0.15% 1.00% 0.04% 0.03% 1.00% 11.5-13.5%
ASTM A194 grade 6F 0.15% 1.25% 0.06% 0.06% 1.00% 12.0-14.0% Selenium-0.15% min
ASTM A194 grade 7 and 7M (AISI 4140) 0.37-0.49% 0.65-1.10% 0.04% 0.04% 0.15-0.035% 0.75-1.20% 0.15-0.25%
ASTM A194 grade 8 (AISI 304) 0.08% 2.00% max 0.05% 0.03% 1.00% max 18.0-20.0% 8.0-11.0%
ASTM A194 grade 8M (AISI 316) 0.08% 2.00% max 0.05% 0.30% 1.00% max 16.0-18.0% 10.0-14.0% 2.00-3.00%
ASTM A194 grade 8C 0.08% 2.00% 0.045% 0.03% 1.00% 17.0-19.0% 9.0-12.0% Columbium and Tantalum – 10x carbon content, min
ASTM A194 grade 8T 0.80% 2.00% 0.045% 0.30% 1.00% 17.0-19.0% 9.0-12.0% Titanium-0.70%max, Nitrogen-0.10%
ASTM A194 grade 8F 0.15% 2.00% 0.20% 0.15%min 1.00% 17.0-19.0% 8.0-10.0%
ASTM A194 grade 8R 0.06% 4.0-6.0% 0.045% 0.03% 1.00% 20.5-23.5% 11.5-13.5% 1.50-3.00% Columbium and Tantalum-0.10-0.30%, Nirogen-0.20-0.40%, Vanadium-0.10-0.30%
ASTM A194 grade 8S 0.10% 7.0-9.0% 0.060% 0.03% 3.5-4.5% 16.0-18.0% 8.0-9.0% Nitrogen-0.08-0.18%
ASTM A194 grade 16 0.36-0.47% 0.45-0.70% 0.035% 0.40% 0.15-0.35% 0.80-1.15% 0.50-0.65%

ASTM A194 Mechanical Properties

Grade Identification Marking5 Specification Material Nominal Size, In. Tempering Temp. °F Proof Load Stress, ksi Hardness Rockwell See Note
Min Max
ASTM A194 Gr 2 ASTM A194 Grade 2 Medium Carbon Steel 1/4 – 4 0 150 159 352 1,2,3
ASTM A194 Gr 2H ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered 1/4 – 4 850 175 C24 C38 1,2
ASTM A194 Gr 2HM ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered 1/4 – 4 1150 150 159 237 1,2,3
ASTM A194 Gr 4 ASTM A194 Grade 4 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 – 4 1100 175 C24 C38 1,2
ASTM A194 Gr 7 ASTM A194 Grade 7 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 – 4 1100 175 C24 C38 1,2
ASTM A194 Gr 7M ASTM A194 Grade 7M Medium Carbon Alloy Steel, Quenched and Tempered 1/4 – 4 1150 150 159 237 1,2,3
ASTM A194 Gr 8 ASTM A194 Grade 8 Stainless AISI 304 1/4 – 4 – 80 126 300 4
ASTM A194 Gr 8M ASTM A194 Grade 8M Stainless AISI 316 1/4 – 4 – 80 126 300 4

Metric Steel Nuts Materials

  • Stainless steel 18-8 (A-2): Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use.
  • Stainless steel 316 (A-4): Also known as A-4 stainless, 316 is a highly corrosion resistant grade of stainless steel. Ideal for saltwater and chlorine environments. More expensive than 18-8.
  • Zinc-plated steel: A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
  • Zinc plated class 8.8 steel: A tempered medium carbon steel. Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in automotive applications. Class 8.8 is similar to grade 5. Zinc plated for moderate corrosion resistance.
  • Zinc plated class 10.9 steel: A tempered medium carbon steel. Class 10.9 is stronger than class 8.8 and is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. Zinc plated for moderate corrosion resistance.
  • Chrome-plated steel: A low carbon steel for general use. Chrome-plated and polished for a mirror-like finish.

3 Responses

  2. is there any codes (ASME, ASTM, etc.) recommend pairing of bolt and nut type (i.e B7 bolt & 2H nut)

    Reply

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