ASTM A194
A194 is a ASTM International specification for nuts. A194 covers a variety of carbon, alloy and stainless steel nuts in sizes 1/4" through 4", M6 through M100 nominal in metric. Nuts of this specification are intended for high-pressure or high-temperature use, or both.
ASTM A194
A194 is a ASTM International specification for nuts
A194 covers a variety of carbon, alloy and stainless steel nuts in sizes 1/4" through 4", M6 through M100 nominal in metric. Nuts of this specification are intended for high-pressure or high-temperature use, or both.
A194 Grades
A194 Grade 2:
Carbon steel heavy hex nuts.
A194 Grade 2H:
Quenched and tempered carbon steel heavy hex nuts.
A194 Grade 7:
Quenched and tempered alloy steel heavy hex nuts.
A194 Grade 7L:
Quenched and tempered alloy steel heavy hex nuts, Charpy impact tested.
A194 Grade 8:
Stainless AISI 304 heavy hex nuts.
A194 Grade 8M:
Stainless AISI 316 heavy hex nuts.
NOTE: There are other grades of A194. Those listed here are the ones we receive the most requests for. For information on other types, please contact one of our salesmen.
A194 MECHANICAL PROPERTIES |
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|---|---|---|---|---|---|---|
| Grade | Marking | Size | Tempering Temp. Fahrenheit |
Proof Load Stress, ksi | Hardness Brinell | |
| Min | Max | |||||
| 2 | 2 | 1/4" - 4" | 0 | 150 | 159 | 352 |
| 2H | 2H | 1/4" - 1-1/2" | 850 | 175 | 248 | 327 |
| 2H | 2H | 1-1/2" - 4" | 850 | 175 | 212 | 327 |
| 7 | 7 | 1/4" - 4" | 1100 | 175 | 248 | 327 |
| 8 | 8 | 1/4" - 4" | - | 80 | 126 | 300 |
| 8M | 8M | 1/4" - 4" | - | 80 | 126 | 300 |
Notes:
- The markings shown for all grades of A194 nuts are for cold-formed and hot-forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter B. The letters H & M indicate heat-treated nuts.
- Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
A194 CHEMICAL PROPERTIES |
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|---|---|---|---|---|
| Element | 2, 2H | 7 | 8 (AISI 304) | 8M (AISI 316) |
| Carbon | 0.4% min | 0.37 - 0.49% | 0.08% max | 0.08% max |
| Manganese | 1.0% max | 0.65 - 1.1% | 2.0% max | 2.0% max |
| Phosphorus, max | 0.04% | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.05% | 0.04% | 0.03% | 0.03% |
| Silicon | 0.40% max | 0.15 - 035% | 1.0% max | 1.0% max |
| Chromium | 0.75 - 1.2% | 18.0 - 20.0% | 16.0 - 18.0% | |
| Nickel | 8.0 - 11.0% | 10.0 - 14.0% | ||
| Molybdenum | 0.15 - 0.25% | 2.0 - 3.0% |
HEX NUT DIMENSIONS |
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|---|---|---|---|---|
| Nut Size | Heavy Hex Nut | Heavy Hex Jam Nut | ||
| A | B | A | C | |
| 1/4" | 1/2 | 15/64 | 1/2 | 11/64 |
| 5/16" | 9/16 | 19/64 | 9/16 | 13/64 |
| 3/8" | 11/16 | 23/64 | 11/16 | 15/64 |
| 7/16" | 3/4 | 27/64 | 3/4 | 17/64 |
| 1/2" | 7/8 | 31/64 | 7/8 | 19/64 |
| 9/16" | 15/16 | 35/64 | 15/16 | 21/64 |
| 5/8" | 1-1/6 | 39/64 | 1-1/16 | 23/64 |
| 3/4" | 1-1/4 | 47/64 | 1-1/4 | 27/64 |
| 7/8" | 1-7/16 | 55/64 | 1-7/16 | 31/64 |
| 1" | 1-5/8 | 63/64 | 1-5/8 | 35/64 |
| 1-1/8" | 1-13/16 | 1-7/64 | 1-13/16 | 39/64 |
| 1-1/4" | 2 | 1-7/32 | 2 | 23/32 |
| 1-3/8" | 2-3/16 | 1-11/32 | 2-3/16 | 25/32 |
| 1-1/2" | 2-3/8 | 1-15/32 | 2-3/8 | 27/32 |
| 1-5/8" | 2-9/16 | 1-19/32 | 2-9/16 | 29/32 |
| 1-3/4" | 2-3/4 | 1-23/32 | 2-3/4 | 31/32 |
| 1-7/8" | 2-15/16 | 1-27/32 | 2-15/16 | 1-1/32 |
| 2" | 3-1/8 | 1-31/32 | 3-1/8 | 1-3/32 |
| 2-1/4" | 3-1/2 | 2-13/64 | 3-1/2 | 1-13/64 |
| 2-1/2" | 3-7/8 | 2-29/64 | 3-7/8 | 1-29/64 |
| 2-3/4" | 4-1/4 | 2-45/64 | 4-1/4 | 1-37/64 |
| 3" | 4-5/8 | 2-61/64 | 4-5/8 | 1-45/64 |
| 3-1/4" | 5 | 3-3/16 | 5 | 1-13/16 |
| 3-1/2" | 5-3/8 | 3-7/16 | 5-3/8 | 1-15/16 |
| 3-3/4" | 5-3/4 | 3-11/16 | 5-3/4 | 2-1/16 |
| 4" | 6-1/8 | 3-15/16 | 6-1/8 | 2-3/16 |
THREAD DIMENSIONS & OVERSIZING ALLOWANCESFOR HOT-DIPPED GALVANIZED NUTS |
|||
|---|---|---|---|
| Size & Thread Pitch | Diametral Allowance | Pitch Diameter | |
| min | max | ||
| 1/4"-20 | 0.016 | 0.2335 | 0.2384 |
| 5/16"-18 | 0.017 | 0.2934 | 0.2987 |
| 3/8"-16 | 0.017 | 0.3514 | 0.3571 |
| 7/16"-14 | 0.018 | 0.4091 | 0.4152 |
| 1/2"-13 | 0.018 | 0.4680 | 0.4745 |
| 9/16"-12 | 0.020 | 0.5284 | 0.5352 |
| 5/8"-11 | 0.020 | 0.5860 | 0.5932 |
| 3/4"-10 | 0.020 | 0.7050 | 0.7127 |
| 7/8"-9 | 0.022 | 0.8248 | 0.8330 |
| 1"-8 | 0.024 | 0.9428 | 0.9516 |
| 1-1/8"-8 | 0.024 | 1.0678 | 1.0768 |
| 1-1/8"-7 | 0.024 | 1.0562 | 1.0656 |
| 1-1/4"-8 | 0.024 | 1.1928 | 1.2020 |
| 1-1/4"-7 | 0.024 | 1.1812 | 1.1908 |
| 1-3/8"-8 | 0.027 | 1.3208 | 1.3301 |
| 1-3/8"-6 | 0.027 | 1.2937 | 1.3041 |
| 1-1/2"-8 | 0.027 | 1.4458 | 1.4553 |
| 1-1/2"-6 | 0.027 | 1.4187 | 1.4292 |
| 1-3/4"-5 | 0.050 | 1.6701 | 1.6817 |
| 2"-4.5 | 0.050 | 1.9057 | 1.9181 |
| 2-1/4"-4.5 | 0.050 | 2.1557 | 2.1683 |
| 2-1/2"-4 | 0.050 | 2.3876 | 2.4011 |
| 2-3/4"-4 | 0.050 | 2.6376 | 2.6513 |
| 3"-4 | 0.050 | 2.8876 | 2.9015 |
| 3-1/4"-4 | 0.050 | 3.1376 | 3.1517 |
| 3-1/2"-4 | 0.050 | 3.3876 | 3.4019 |
| 3-3/4"-4 | 0.050 | 3.6376 | 3.6521 |
| 4"-4 | 0.050 | 3.8876 | 3.9023 |