ASTM A394 is a standard material specification covering chemical and mechanical requirements of hexagon and square-head zinc-coated steel bolts and atmospheric corrosion-resistant bolts, in nominal thread diameters of 1⁄2, 5⁄8, 3⁄4, 7⁄8 and 1 in. for use in the construction of transmission towers, substations, and similar steel structures. The specification includes type 0, type 1 and type 3 structural bolts in carbon, alloy and weathering steel with plain and coated surfaces.
Find classification of grades, chemical composition, mechanical properties, shear strength, marking, recommended nuts, surface finish or coating and other reference standards for ASTM A394 Bolts.
| Grade | Raw Material Description |
|---|---|
| Type 0 | Low or medium carbon steel. |
| Type 1 | Medium carbon steel, quenched and tempered. |
| Type 3 | Weathering steel, quenched and tempered. |
| Element | Grade | ||
|---|---|---|---|
| Type 0 | Type 1 | Type 3 (Class C) | |
| Carbon | 0.55 max | 0.28 – 0.55 | 0.15 – 0.25 |
| Manganese, max | ... | 0.60 min | 0.80 – 1.35 |
| Phosphorus, max | 0.048 max | 0.048 max | 0.035 max |
| Sulfur, max | 0.058 max | 0.058 max | 0.040 max |
| Silicon | ... | ... | 0.15 – 0.35 |
| Copper | ... | ... | 0.20 – 0.50 |
| Nickel | ... | ... | 0.25 – 0.50 |
| Chromium | ... | ... | 0.30 – 0.50 |
| Vanadium | ... | ... | 0.02 min |
| Nominal size, Inch. | Minimum Tensile Load, lbf | Hardness | ||
|---|---|---|---|---|
| Type 0 | Type 1 and 3 | Type 0 | Type 1 and 3 | |
| 1/2 | 10 500 | 17 050 | 80 – 100 Rockwell B |
25 – 34 Rockwell C |
| 5/8 | 16 700 | 27 100 | ||
| 3/4 | 24 700 | 40 100 | ||
| 7/8 | 34 200 | 55 450 | ||
| 1 | 44 850 | 72 700 | ||
| Grade | Nut Grade | Coating |
|---|---|---|
| Type 0 | A563 Grade A | Hot Dip or Zinc Coating |
| Type 1 | A563 Grade DH | Hot Dip or Zinc Coating |
| Type 3 | A563 Grade DH3 | Plain |
| ASTM A563 | Specification for Carbon and Alloy Steel Nuts |
| ASTM F436 | Specification for Hardened Steel Washers |
| ASTM F2329 | Specification for Zinc Coating, Hot-Dip |
| ASME B1.1 | Unified Screw Threads |
| ASME B18.2.1 | Square and Hex Bolts and Screws |