ASME B18.2.2 UNF UNC chrome plated A563 Grade DH Heavy hex Nuts.
A563 DH covers chemical and mechanical requirements for eight property classes of hex and hex-flange carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
Materials shall be tested and the individual grades shall conform to specified values of material such as hardness and proof load, chemical, and mechanical requirements.
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.
A563 Grade A: Carbon steel hex or heavy nuts.
A563 Grade B: Carbon steel hex or heavy nuts.
A563 Grade C:Quenched and tempered carbon steel heavy hex nuts.
A563 Grade DH:Quenched and tempered carbon steel heavy hex nuts.
NOTE: There are other types of A563. The one listed here is the one we receive the most requests for. For information on other types, please contact us.
| A563 MECHANICAL PROPERTIES |
| Grade | Marking | Style | Size | Proof Load, ksi | Hardness, HBN |
| Plain | Galvanized |
| A | not required | hex | 1/4" - 1-1/2" | 90 | 68 | 116 - 302 |
| heavy hex | 1/4" - 4" | 100 | 75 | 116 - 302 |
| B | not required | heavy hex | 1/4" - 1" | 133 | 100 | 121 - 302 |
| heavy hex | 1-1/8" - 1-1/2" | 116 | 87 | 121 - 302 |
| C | 3 circumferential marks | heavy hex | 1/4" - 4" | 144 | 144 | 143 - 352 |
| DH | DH | heavy hex | 1/4" - 4" | 175 | 150 | 148 - 352 |
| A563 CHEMICAL PROPERTIES |
| Element | A, B & C | DH |
| Carbon | 0.55% max | 0.2 - 0.55% |
| Manganese | | 0.60% |
| Phosphorus, max | 0.12% | 0.04% |
| Sulfur, max | 0.15% | 0.05% |
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