ASTM A563 Specification Suppliers, Manufacturers
The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners. Find below the grades under this specification , marking requirements,Chemical and mechanical Properties
ASTM Nut Grades
| A | Low carbon steel, hex or heavy hex |
|---|---|
| B | Low carbon steel, hex or heavy hex |
| C | Carbon steel, quenched and tempered, heavy hex |
| D | Carbon steel, quenched and tempered, heavy hex |
| DH | Carbon steel, quenched and tempered, heavy hex |
| C3 | Weathering steel, quenched and tempered, heavy hex |
| DH3 | Weathering steel, quenched and tempered, heavy hex |
Chemical Properties
| Element | Grades O, A, B, C | D** | DH** |
|---|---|---|---|
| Carbon | 0.55% max | 0.55% max | 0.20 - 0.55% |
| Manganese, min | 0.30% | 0.60% | |
| Phosphorus, max | 0.12% | 0.04% | 0.04% |
| Sulfur, max | 0.15%* | 0.05% | 0.05% |
| * For grades O, A and B a sulfur content of 0.23% max is acceptable with the purchasers approval | |||
| ** For grades D and DH a sulfur content of 0.05 - 0.15% is acceptable provided the manganese is 1.35% min | |||
| Element | Classes for Grade C3* | DH3 | ||||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | N | ||
| Carbon | 0.33 - 0.40% | 0.38 - 0.48% | 0.15 - 0.25% | 0.15 - 0.25% | 0.20 - 0.25% | 0.20 - 0.25% | 0.20 - 0.53% | |
| Manganese | 0.90 - 1.20% | 0.70 - 0.90% | 0.80 - 1.35% | 0.40 - 1.20% | 0.60 - 1.00% | 0.90 - 1.20% | 0.40% min | |
| Phosphorus | 0.040% max | 0.06 - 0.12% | 0.035% max | 0.040% max | 0.040% max | 0.040% max | 0.07 - 0.15% | 0.046% max |
| Sulfur, max | 0.050% | 0.050% | 0.040% | 0.050% | 0.040% | 0.040% | 0.050% | 0.050% |
| Silicon | 0.15 - 0.35% | 0.30 - 0.50% | 0.15 - 0.35% | 0.25 - 0.50% | 0.15 - 0.35% | 0.15 - 0.35% | 0.20 - 0.90% | |
| Copper | 0.25 - 0.45% | 0.20 - 0.40% | 0.20 - 0.50% | 0.30 - 0.50% | 0.30 - 0.60% | 0.20 - 0.40% | 0.25 - 0.55% | 0.20% min |
| Nickel | 0.25 - 0.45% | 0.50 - 0.80% | 0.25 - 0.50% | 0.50 - 0.80% | 0.30 - 0.60% | 0.20 - 0.40% | 1.00% max | 0.20% min** |
| Chromium | 0.45 - 0.65% | 0.50 - 0.75% | 0.30 - 0.50% | 0.50 - 1.00% | 0.60 - 0.90% | 0.45 - 0.65% | 0.30 - 1.25% | 0.45% min |
| Vanadium | 0.020% min | |||||||
| Molybdenum | 0.06% max | 0.10% max | 0.15% min** | |||||
| Titanium | 0.05% max | |||||||
| * Selection of a class shall be at the option of the manufacturer | ||||||||
| ** Nickel or Molybdenum may be used. | ||||||||
Markings & Grade Idenficiation for ASTM A563 Nuts
| Grade Identification Marking | Specification | Material | Nominal Size, In. | Proof Load Stress, ksi | Hardness Rockwell | See Note | |
|---|---|---|---|---|---|---|---|
| Min | Max | ||||||
 Blank |
ASTM A563 Grade O | Carbon Steel | 1/4 - 1-1/2 | 69 | B55 | C32 | 2,3 |
| ASTM A563 Grade A | Carbon Steel | 1/4 - 1-1/2 | 90 | B68 | C32 | 2,3 | |
| ASTM A563 Grade B | Carbon Steel | 1/4 - 1 | 120 | B69 | C32 | 2,3 | |
| >1 - 1-1/2 | 105 | ||||||
 |
ASTM A563 Grade C | Carbon Steel, may be Quenched and Tempered | 1/4 - 4 | 144 | B78 | C38 | 4 |
 |
ASTM A563 Grade C3 | Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered | 1/4 - 4 | 144 | B78 | 38 | 4,6 |
 |
ASTM A563 Grade D | Carbon Steel, may be Quenched and Tempered | 1/4 - 4 | 150 | B84 | C38 | 5 |
 |
ASTM A563 Grade DH | Carbon Steel, Quenched and Tempered | 1/4 - 4 | 175 | C24 | C38 | 5 |
 |
ASTM A563 Grade DH3 | Atmospheric Corrosion Resistant Steel, Quenched and Tempered | 1/4 - 4 | 175 | C24 | C38 | 4,6 |