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In the ASTM A194 specification, ASTM A194 Grade 8T nuts were not a standard designation as of January 2022, when I last updated this information. For use in high-pressure and high-temperature applications, this specification normally covers many types of heavy hex nuts composed of carbon and alloy steel as well as stainless steel. Nevertheless, it’s possible that at the time the standard did not include certain classifications like Grade 8T. The most recent edition of the standard should be consulted for precise details on ASTM A194 Grade 8T nuts or any recent changes to the ASTM requirements.
Quick Section Links
- ASTM A194 Gr. 8T Nuts Specifications
- ASTM A194 Gr. 8T Nuts Size Chart
- ASTM A194 Gr. 8T Hex Nut Dimensions
- ASTM A194 Gr. 8T Nuts Inventory
- ASTM A194 Gr. 8T Heavy Hex Nuts Dimension
- ASTM A194 Gr. 8T Nuts Chemical Composition
- ASTM A194 Gr. 8T Nuts Mechanical Properties
- Available Stock of ASTM A194 Gr. 8T Nuts
- Applications of ASTM A194 Gr. 8T Nuts
ASTM A194 GR. 8T Nuts Specifications
| Grade | ASTM A194 Grade 8T |
| 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. 8T 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. 8T 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. 8T Nuts Inventory
ASTM A194 GR. 8T Hex Nuts
ASTM A194 GR. 8T Lock Nuts
ASTM A194 GR. 8T Wing Nuts
ASTM A194 GR. 8T 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. 8T Nuts Chemical Composition
| ASTM | A194 Grade 8 |
| Percentage | % |
| C. | 0.08 % |
| Mn. | 2.00 % |
| Si. | 1.00 % |
| P. | 0.05 %. |
| S. | 0.03 % |
| Cr. | 17.0-19.0 % |
| Ni. | 9.0-12.0 |
| Mo. | — |
ASTM A194 GR. 8T Nuts Mechanical Properties
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8T | Type 321 | S32100 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 9.0-12.0 | – | 5 x (C+N),Min – 0.70 max | – | 0.100 | – |
Available Stock of ASTM A194 GR. 8T Nuts
- ASTM A194 GR. 8T Panel Nut
- ASTM A194 8T Dome Nuts
- ASTM A194 GR. 8T Serrated Flange Nut
- ASTM A194 GR. 8T Hex Nut
- ASTM A194 GR. 8T Nut
- ASTM A194 8T Serrated Flange Nuts
- ASTM A194 GR. 8T Wing Nut
- ASTM A194 GR. 8T Self Locking Nuts
- ASTM A194 GR. 8T | ASME B18T.2.1 High Nuts
- ASTM A194 GR. 8T Spring T Nuts
- ASTM A194 GR. 8T Hexagone Nuts
- ASME B18T.2.1 ASTM A194 8T Nuts
- ASTM A194 GR. 8T Hex Nuts
- ASTM A194 8T Slotted Nut
- ASME SA194 Gr. 8T B18T.3 Nylon Insert Nut
- ASTM A194 GR. 8T Structural Nuts
- ASTM A194 GR. 8T Flex Lock Nut
- ASTM A194 GR. 8T 2 Way Lock Nuts
- ASTM A194 GR. 8T Square Nuts
- ASTM A194 8T Coupler Nuts
- ASTM A194 GR. 8T Hexagon Nuts
- ASTM A194 GR. 8T Heavy Hex Nuts
- ASTM A194 8T Hex Nuts
- ASTM A194 GR. 8T 2 Way Lock Nut
Applications of ASTM A194 GR. 8T 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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