The nominal size of the ASTM A194 2h Nuts ranges from ¼ inches to 4 inches. These products are made as heavy hex nuts and they come in different proof load stresses for plain and galvanized nuts. The A194 2h Coupling Nut comes with 175ksi proof load stress for plain nuts and 150ksi for galvanized nuts. The fasteners in this grade of material are also of high hardness. The hardness of the Sa194-2h Nuts is 248BHN minimum in the Brinell hardness score. As these are heavy tensile nuts, these are used in heavy vibration and high stress applications such as aircraft engine components and in automobile engine components. The ASTM A194 Grade 2h Material is made up of carbon, manganese, phosphorus, sulfur and silicon for all classes. The class 4 has added molybdenum in the composition. The classes 7, 7M, 8 and 8M have added nickel from 8-10%. Class 8 material lacks molybdenum but the class 8M ASTM A194 2h Material all the mentioned elements in the composition, making it the strongest and most expensive class in this grade of material. Regal Sales Corporation is a leading manufacturer and supplier of the different types of fasteners such as the ASTM A194 Grade 2h Washer and others. Please feel free to contact us for more information on the different types and classes such as the Grade 2h Hex Nuts.
ASTM A194 Grade 2H Nuts
ASTM A194 Grade 2h washer
ASTM A194 Grade 2h heavy hex nut
ASTM A194 Grade 2h Heavy Hex Nut is made under the specification for carbon steel, alloy steel and stainless steel nuts for high pressure and high temperature services. There are different classes to these nuts such as 2, 2H, 2HM and so on. The different classes have different heat treatment properties and therefore varying mechanical properties.
Standards |
Designation |
---|---|
ASTM |
A194 2H: Quenched & Tempered Carbon Steel Heavy Hex Nuts. |
Dimensions |
ASME B18.2.1, B18.3 |
---|---|
Mandatory Requirements |
Free from Mercury & Radioactive Contamination |
Certification |
Dual Certified As per ASTM & ASME Codes |
Threads Configuration |
ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads |
Additional Requirements |
NACE MR0103/ MR0175/ ISO 15156 Compliance |
Additional Certifications |
PED 97 23/ EC Certified, Merkblatt AD 2000 W2 Certified |
Nominal Size or Basic Major Thread Diameter | F | G | H | ||||||
Width Across Flats |
Width Across Corners |
Thickness | |||||||
Basic | Max | Min | Max | Min | Basic | Max | Min | ||
1/4 | .2500 | 7/16 | .438 | .428 | .505 | .488 | 7/32 | .226 | .212 |
5/16 | .3125 | 1/2 | .500 | .489 | .577 | .557 | 17/64 | .273 | .258 |
7/16 | .4375 | 11/16 | .688 | .675 | .794 | .768 | 3/8 | .385 | .365 |
1/2 | .5000 | 3/4 | .750 | .736 | .866 | .840 | 7/16 | .448 | .427 |
9/16 | .5625 | 7/8 | .875 | .861 | 1.010 | .982 | 31/64 | .496 | .473 |
3/4 | .7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 41/64 | .665 | .617 |
7/8 | .8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 3/4 | .776 | .724 |
1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 31/32 | .999 | .939 |
1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 1-11/64 | 1.206 | 1.138 |
1-1/2 | 1.500 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 1-9/32 | 1.ASTM A194 GR. 8 | 1.245 |
1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 1-1/2 | 1.540 | 1.460 |
2 | 2.0000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.763 | 1.675 |
2-1/4 | 2.2500 | 3-3/8 | 3.375 | 3.263 | 3.897 | 3.719 | 1-15/16 | 1.986 | 1.890 |
2-3/4 | 2.7500 | 4-1/8 | 4.125 | 3.988 | 4.763 | 4.546 | 2-3/8 | 2.431 | 2.319 |
Nut Size (mm) |
Diameter* (mm) |
Height (mm) |
||
---|---|---|---|---|
Hex Nut | Jam Nut | Nylock Nut | ||
2 | 4 | 1.6 | 1.2 | - |
2.5 | 5 | 2 | 1.6 | - |
3 | 5.5 | 2.4 | 1.8 | 4 |
4 | 7 | 3.2 | 2.2 | 5 |
5 | 8 | 4 | 2.7 | 5 |
6 | 10 | 5 | 3.2 | 6 |
7 | 11 | 5.5 | 3.5 | - |
8 | 13 | 6.5 | 4 | 8 |
10 | 17 | 8 | 5 | 10 |
12 | 19 | 10 | 6 | 12 |
14 | 22 | 11 | 7 | 14 |
16 | 24 | 13 | 8 | 16 |
18 | 27 | 15 | 9 | 18.5 |
20 | 30 | 16 | 10 | 20 |
Chemicals | Percentage % |
C. | 0.40% |
Mn. | 1% |
Si. | 00.40% |
P. | 0.04%. |
S. | 0.050% |
Cr. | -- |
Ni. | -- |
Mo. | -- |
Specification | Material | Nominal Size, In. | Tempering Temp. °F | Proof Load Stress, ksi | Hardness Rockwell | See Note | |
---|---|---|---|---|---|---|---|
Min | Max | ||||||
ASTM A194 Grade 2H | Medium Carbon Steel, Quenched and Tempered | 1/4 - 4 | 1000 | 175 | C24 | C38 | 1,2 |
Diameter (D) | Body Diameter (D) | Across the Flats (F) | Across the Corners © | Head Height (H) | Thread Lengths (T) | |||||
---|---|---|---|---|---|---|---|---|---|---|
MAX | MIN | MAX | MIN | MAX | MIN | MAX | MIN | < 6” | > 6” | |
1/2 | 0.515 | 0.482 | 0.875 | 0.85 | 1.01 | 0.969 | 0.364 | 0.302 | 1.25 | 1.5 |
5/8 | 0.642 | 0.605 | 1.062 | 1.031 | 1.227 | 1.175 | 0.444 | 0.378 | 1.5 | 1.75 |
3/4 | 0.768 | 0.729 | 1.25 | 1.212 | 1.443 | 1.383 | 0.524 | 0.455 | 1.75 | 2 |
7/8 | 0.895 | 0.852 | 1.438 | 1.394 | 1.66 | 1.589 | 0.604 | 0.531 | 2 | 2.25 |
1 | 1.022 | 0.976 | 1.625 | 1.575 | 1.876 | 1.796 | 0.7 | 0.591 | 2.25 | 2.5 |
1 1/8 | 1.149 | 1.098 | 1.812 | 1.756 | 2.093 | 2.002 | 0.78 | 0.658 | 2.5 | 2.75 |
1 1/4 | 1.277 | 1.223 | 2 | 1.938 | 2.309 | 2.209 | 0.876 | 0.749 | 2.75 | 3 |
1 3/8 | 1.404 | 1.345 | 2.188 | 2.119 | 2.526 | 2.416 | 0.94 | 0.81 | 3 | 3.25 |
1 1/2 | 1.531 | 1.47 | 2.375 | 2.3 | 2.742 | 2.622 | 1.036 | 0.902 | 3.25 | 3.5 |
1 3/4 | 1.785 | 1.716 | 2.75 | 2.662 | 3.175 | 3.035 | 1.196 | 1.054 | 3.75 | 4 |
2 | 2.039 | 1.964 | 3.125 | 3.025 | 3.608 | 3.449 | 1.388 | 1.175 | 4.25 | 4.5 |
2 1/4 | 2.305 | 2.214 | 3.5 | 3.388 | 4.041 | 3.862 | 1.548 | 1.327 | 4.75 | 5 |
2 1/2 | 2.559 | 2.461 | 3.875 | 3.75 | 4.474 | 4.275 | 1.708 | 1.479 | 5.25 | 5.5 |
2 3/4 | 2.827 | 2.711 | 4.25 | 4.112 | 4.907 | 4.688 | 1.869 | 1.632 | 5.75 | 6 |
3 | 3.081 | 2.961 | 4.625 | 4.475 | 5.34 | 5.102 | 2.06 | 1.815 | 6.25 | 6.5 |