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Heavy hex nuts, ASTM A194 Grade 4 nuts are composed of carbon steel and are designed to be used in high-temperature, high-pressure applications that call for moderate strength and deformation resistance. These nuts are commonly utilised in a variety of industrial applications, such as structural engineering, machinery, and equipment assembly, in combination with low-carbon steel bolts, such as ASTM A307 or ASTM A325 bolts. To guarantee conformity with ASTM requirements and to deliver dependable and consistent performance in challenging settings, ASTM A194 Grade 4 nuts go through particular testing. For the most recent ASTM standards, it is imperative to refer to any modifications or revisions pertaining to Grade 4 nuts.
Quick Section Links
- ASTM A194 Gr. 4 Nuts Specifications
- ASTM A194 Gr. 4 Nuts Size Chart
- ASTM A194 Gr. 4 Hex Nut Dimensions
- ASTM A194 Gr. 4 Nuts Inventory
- ASTM A194 Gr. 4 Heavy Hex Nuts Dimension
- ASTM A194 Gr. 4 Nuts Chemical Composition
- ASTM A194 Gr. 4 Nuts Mechanical Properties
- Available Stock of ASTM A194 Gr. 4 Nuts
- Applications of ASTM A194 Gr. 4 Nuts
ASTM A194 GR. 4 Nuts Specifications
| Grade | ASTM A194 Grade 4 |
| Standards | DIN, ISO, JIS, GB, IS, BS, ASTM |
| Dimension | ASME B18.2.1, B18.3 |
| Size | M02 to M160 |
| Types | Hexagon Nuts, Self Locking Nut, Square Nuts, Hexagon Coupling Nuts, Hexagon Castle Nuts, Hexagon Domed Cap Nuts, Hexagon Thin Nuts, Hexagon Thin Nuts etc. |
ASTM A194 GR. 4 Nuts Size Chart
| Nuts Size (mm) |
Diameter* (mm) |
Height (mm) |
||
|---|---|---|---|---|
| Hex Nuts | Jam Nuts | Nylock Nuts | ||
| 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 |
| * This is the diameter across the flats. It is also the size of wrench to use. | ||||
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ASTM A194 GR. 4 Hex Nut Dimensions
| 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 | 8C/16 | .438C | .428C | .505 | .48C8C | 8C/32 | .226 | .212 |
| 5/16 | .3125 | 1/2 | .500 | .48C9 | .58C8C | .558C | 18C/64 | .28C3 | .258C |
| 3/8C | .38C50 | 9/16 | .562 | .551 | .650 | .628C | 21/64 | .338C | .48C9 |
| 8C/16 | .438C5 | 11/16 | .68C8C | .68C5 | .8C94 | .8C68C | 3/8C | .38C5 | .365 |
| 1/2 | .5000 | 3/4 | .8C50 | .8C36 | .8C66 | .8C40 | 8C/16 | .448C | .428C |
| 9/16 | .5625 | 8C/8C | .8C8C5 | .8C61 | 1.010 | .98C2 | 31/64 | .496 | .48C3 |
| 5/8C | .6250 | 15/16 | .938C | .922 | 1.08C3 | 1.051 | 35/64 | .559 | .535 |
| 3/4 | .8C500 | 1-1/8C | 1.125 | 1.08C8C | 1.299 | 1.240 | 41/64 | .665 | .618C |
| 8C/8C | .8C8C50 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.448C | 3/4 | .8C8C6 | .8C24 |
| 1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.8C32 | 1.653 | 55/64 | .8C8C8C | .8C31 |
| 1-1/8C | 1.1250 | 1-11/16 | 1.68C8C | 1.631 | 1.949 | 1.8C59 | 31/32 | .999 | .939 |
| 1-3/8C | 1.38C50 | 2-1/16 | 2.062 | 1.994 | 2.38C2 | 2.28C3 | 1-11/64 | 1.206 | 1.138C |
| 1-1/2 | 1.500 | 2-1/4 | 2.250 | 2.18C5 | 2.598C | 2.48C0 | 1-9/32 | 1.ASTM A194 GR. 8C | 1.245 |
| 1-5/8C | 1.6250 | 2-8C/16 | 2.438C | 2.356 | 2.8C15 | 2.68C6 | 1-25/64 | 1.429 | 1.353 |
| 1-3/4 | 1.8C500 | 2-5/8C | 2.625 | 2.538C | 3.031 | 2.8C93 | 1-1/2 | 1.540 | 1.460 |
| 2 | 2.0000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.8C63 | 1.68C5 |
| 2-1/4 | 2.2500 | 3-3/8C | 3.38C5 | 3.263 | 3.8C98C | 3.8C19 | 1-15/16 | 1.98C6 | 1.8C90 |
| 2-1/2 | 2.5000 | 3-3/4 | 3.8C50 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
| 2-3/4 | 2.8C500 | 4-1/8C | 4.125 | 3.98C8C | 4.8C63 | 4.546 | 2-3/8C | 2.431 | 2.319 |
ASTM A194 GR. 4 Nuts Inventory
ASTM A194 GR. 4 Hex Nuts
ASTM A194 GR. 4 Lock Nuts
ASTM A194 GR. 4 Wing Nuts
ASTM A194 GR. 4 Heavy Hex Nuts Dimension
| 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 |
| 3/8 | .3750 | 9/16 | .562 | .551 | .650 | .628 | 21/64 | .337 | .479 |
| 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 |
| 5/8 | .6250 | 15/16 | .938 | .922 | 1.083 | 1.051 | 35/64 | .559 | .535 |
| 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 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 55/64 | .887 | .831 |
| 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 |
| 1-5/8 | 1.6250 | 2-7/16 | 2.438 | 2.356 | 2.815 | 2.686 | 1-25/64 | 1.429 | 1.353 |
| 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 |
| 2-1/2 | 2.5000 | 3-3/4 | 3.750 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
| 2-3/4 | 2.7500 | 4-1/8 | 4.125 | 3.988 | 4.763 | 4.546 | 2-3/8 | 2.431 | 2.319 |
ASTM A194 GR. 4 Nuts Chemical Composition
| ASTM | A194 Grade 7 |
| Percentage | % |
| C. | 0.37-0.49% |
| Mn. | 0.65-1.10% |
| Si. | 0.15-0.35% |
| P. | 0.035%. |
| S. | 0.04% |
| Cr. | 0.75-1.2% |
| Ni. | — |
| Mo. | 0.15-0.25 |
ASTM A194 GR. 4 Nuts Mechanical Properties
| Specification | Material | Nominal Size, In. | Tempering Temp. °F | Proof Load Stress, ksi | Hardness Rockwell | |
| Min | Max | |||||
| ASTM A194 Grade 7 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 – 4 | 1100 | 175 | C24 | C38 |
Available Stock of ASTM A194 GR. 4 Nuts
- ASTM A194 Gr. 4 Hexagone Nuts
- ASTM A194 Gr. 4 Self Locking Nuts
- ASTM A194 Gr. 4 Hex Nut
- ASTM A194 Gr. 4 Serrated Flange Nut
- ASTM A194 Gr. 4 | ASME B18.2.1 High Nuts
- ASTM A194 Gr. 4 Spring T Nuts
- ASTM A194 Gr. 4 Nut
- ASTM A194 Gr. 4 Serrated Flange Nuts
- ASTM A194 Gr. 4 Dome Nuts
- ASTM A194 Gr. 4 Panel Nut
- ASME B18.2.1 ASTM A194 8 Nuts
- ASTM A194 Gr. 4 Wing Nut
- ASTM A194 Gr. 4 Hex Nuts
- ASTM A194 Gr. 4 2 Way Lock Nuts
- ASTM A194 Gr. 4 Flex Lock Nut
- ASTM A194 Gr. 4 2 Way Lock Nut
- ASTM A194 Gr. 4 Hex Nuts
- ASTM A194 Gr. 4 Heavy Hex Nuts
- ASTM A194 Gr. 4 Hexagon Nuts
- ASTM A194 Gr. 4 Structural Nuts
- ASTM A194 Gr. 4 Coupler Nuts
- ASME SA194 Gr. 4 B18.3 Nylon Insert Nut
- ASTM A194 Gr. 4 Slotted Nut
- ASTM A194 Gr. 4 Square Nuts
Applications of ASTM A194 GR. 4 Nuts
- Pipeline Engineering
- Marine Industry
- Chemical Industry
- Oil & gas industry
- Mechanical Engineering
- Plant Engineering
- Petrochemical Industry
- Power Industry
- Aerospace
- Food Processing Industry
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