Quenched and tempered carbon steel ASTM A194 Grade 2H black heavy hex nuts
ASTM A194 Grade 2H is a high strength nut with virtually identical mechanical requirements, but with additional heat treating and testing performed. This added heat treating and testing is required to ensure the nut performs at high temperature. ASTM A194 is a high temperature and/or pressure bolting specification that is often used in piping or mechanical applications. Due to the mass-production of these nuts for these applications, A194 Grade 2H nuts are often widely available and are economical in certain diameters and finishes making them an excellent substitution for any A563 nut. In particular, A194 Grade 2H nuts are substituted and commonly used in place of A563 Grade DH heavy hex nuts.
SIZE: 1/4" - 4", M6 -M100 .
STANDARD: ASME B18.2.2
THREAD: ASME B1.1 , UNC, UNF, UN8
FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G.
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 us.
| A194 CHEMICAL PROPERTIES |
| 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% | 0.04% | 0.05% | 0.05% |
| 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% |
| A194 MECHANICAL PROPERTIES |
| 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.
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Quenched And Tempered Carbon Black Heavy Hex Nut Steel ASTM A194 Grade 2HM Images
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