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Heavy carbon steel hex nuts, ASTM A194 Grade 8C Nuts are frequently used in high-temperature and high-pressure applications where dependable and strong fastening is essential. To obtain their desired mechanical qualities, such as high strength and resistance to deformation, these nuts are usually heat-treated. Pressure vessels, piping systems, and structural connections are among the applications where ASTM A194 Grade 8C nuts are frequently used in conjunction with high-strength bolts like ASTM A193 Grade B7 bolts. They are put through rigorous testing to make sure they meet ASTM requirements and deliver dependable, consistent performance in difficult settings.
Quick Section Links
- ASTM A194 Gr. 8C Nuts Specifications
- ASTM A194 Gr. 8C Nuts Size Chart
- ASTM A194 Gr. 8C Hex Nut Dimensions
- ASTM A194 Gr. 8C Nuts Equivalent Grade
- ASTM A194 Gr. 8C Nuts Inventory
- ASTM A194 Gr. 8C Heavy Hex Nuts Dimension
- ASTM A194 Gr. 8C Nuts Chemical Composition
- ASTM A194 Gr. 8C Nuts Mechanical Properties
- Available Stock of ASTM A194 Gr. 8C Nuts
- Applications of ASTM A194 Gr. 8C Nuts
ASTM A194 GR. 8C Nuts Specifications
| Grade | ASTM A194 Grade 8C |
| 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. 8C 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. 8C 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. 8C Nuts Equivalent Grade
| Standards | Designation | UNS |
| ASTM | A194 | Grade : 8C , 347 Stainless Steel Heavy Hex Nuts. | S34700 |
ASTM A194 GR. 8M Nuts Inventory
ASTM A194 GR. 8C Hex Nuts
ASTM A194 GR. 8C Lock Nuts
ASTM A194 GR. 8C Wing Nuts
ASTM A194 GR. 8C 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. 8C 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. 8C Nuts Mechanical Properties
| Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) | Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa) | Elongation in 4D (El) | Reduction | Hardness – (BHN) |
| 550 | 240 | 30 | 40 | 223 |
Available Stock of ASTM A194 GR. 8C Nuts
- ASTM A194 GR. 8C Panel Nut
- ASTM A194 8C UNS S34700 Dome Nuts
- ASTM A194 GR. 8C Serrated Flange Nut
- ASTM A194 GR. 8C Hex Nut
- ASTM A194 GR. 8C Nut
- ASTM A194 8C UNS S34700 Serrated Flange Nuts
- ASTM A194 GR. 8C Wing Nut
- ASTM A194 GR. 8C Self Locking Nuts
- ASTM A194 GR. 8C | ASME B18C.2.1 High Nuts
- ASTM A194 GR. 8C Spring T Nuts
- ASTM A194 GR. 8C Hexagone Nuts
- ASME B18C.2.1 ASTM A194 8C Nuts
- ASTM A194 GR. 8C Structural Nuts
- ASTM A194 GR. 8C 2 Way Lock Nut
- ASTM A194 GR. 8C Flex Lock Nut
- ASME SA194 Gr. 8C B18C.3 Nylon Insert Nut
- ASTM A194 GR. 8C Hex Nuts
- ASTM A194 8C UNS S34700 Coupler Nuts
- ASTM A194 8C UNS S34700 Slotted Nut
- ASTM A194 GR. 8C Heavy Hex Nuts
- ASTM A194 GR. 8C Hexagon Nuts
- ASTM A194 8C UNS S34700 Hex Nuts
- ASTM A194 GR. 8C 2 Way Lock Nuts
- ASTM A194 GR. 8C Square Nuts
Applications of ASTM A194 GR. 8C 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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