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ASTM F594 is a standard specification for stainless steel nuts used in various applications, including general-purpose and structural applications. These nuts are typically made from austenitic stainless steel grades such as 304 (A2) or 316 (A4) stainless steel and are available in various styles, including hex nuts, heavy hex nuts, and jam nuts. ASTM F594 nuts are commonly used in industries such as construction, automotive, and marine, where corrosion resistance and durability are essential. These nuts undergo specific testing to ensure compliance with ASTM standards, providing reliable and long-lasting fastening solutions for a wide range of applications.
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ASTM F594 Nuts Specifications
| Grade | ASTM F594 / ASME SF594 |
| Dimension | ASME B18.2.1, B18.3 |
| Coatings | Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request |
| 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 F594 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 |
| * tdis is tde diameter across tde flats. It is also tde size of wrench to use. | ||||
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ASTM F594 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 A594 Nuts Inventory
ASTM F594 Hex Nuts
ASTM F594 Lock Nuts
ASTM F594 Wing Nuts
ASTM F594 Heavy Hex Nuts Dimension
| Nominal Size or Basic Major tdread Diameter | F | G | H | ||||||
| Widtd Across Flats |
Widtd Across Corners |
tdickness | |||||||
| 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 F594 Nuts Chemical Composition
| Element, max except as shown | Alloy Group 1, Type 304 | Alloy Group 2, Type 316 |
| Carbon | 0.08% | 0.08% |
| Manganese | 2.00% | 2.00% |
| Phosphorus | 0.045% | 0.045% |
| Sulfur | 0.030% | 0.030% |
| Silicon | 1.00% | 1.00% |
| Chromium | 18.0 to 20.0% | 16.0 to 18.0% |
| Nickel | 8.0 to 10.5% | 10.0 to 14.0% |
| Copper | 1.00% | – |
| Molybdenum | – | 2.00 to 3.00% |
ASTM F594 Nuts Mechanical Properties
| Alloy Group | Condition | Marking | Diameter Range | Proof Stress, Hex Nuts, ksi | Proof Stress, Heavy Hex Nuts, ksi | Rockwell Hardness |
| 1 | AF | F594A | 1/4 to 1-1/2 | 70 | 76 | B85 max |
| A | F594B | 1/4 to 1-1/2 | 75 | 81 | B65 to 95 | |
| CW1 | F594C | 1/4 to 5/8 | 100 | 108 | B95 to C32 | |
| CW2 | F594D | 3/4 to 1-1/2 | 85 | 92 | B80 to C32 | |
| 2 | AF | F594E | 1/4 to 1-1/2 | 70 | 76 | B85 max |
| A | F594F | 1/4 to 1-1/2 | 75 | 81 | B65 to 95 | |
| CW1 | F594G | 1/4 to 5/8 | 100 | 108 | B95 to C32 | |
| CW2 | F594H | 3/4 to 1-1/2 | 85 | 92 | B80 to C32 |
Available Stock of ASTM F594 Nuts
- ASTM F594 Panel Nut
- ASTM F594 Dome Nuts
- ASTM F594 Serrated Flange Nut
- ASTM F594 Hex Nut
- ASTM F594 Wing Nut
- ASTM F594 Self Locking Nuts
- ASTM F594 High Nuts
- ASTM F594 Spring T Nuts
- ASTM F594 Nuts
- ASTM F594 Structural Nuts
- ASTM F594 2 Way Lock Nut
- ASTM F594 Flex Lock Nut
- ASME SF594 Nylon Insert Nut
- ASTM F594 Coupler Nuts
- ASTM F594 Slotted Nut
- ASTM F594 Heavy Hex Nuts
- ASTM F594 Hexagon Nuts
- ASTM F594 Square Nuts
Applications of ASTM F594 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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