ASTM A394 Tower Bolts
Hot-Dip Galvanized A394 Bolts are designed for durable bolted connections in outdoor steel structures where both mechanical performance and corrosion protection are important. Featuring a hexagonal head and robust threaded design, these bolts provide reliable fastening for structural members while allowing convenient installation with compatible nuts and washers.
Manufactured to ASTM A394 requirements, our bolts are primarily available in Type 0 and Type 1 configurations to meet different structural fastening requirements. The hot-dip galvanized coating provides a protective zinc layer against atmospheric corrosion, making these bolts well suited to long-term outdoor service. They are commonly used in transmission towers, electrical substations, communication towers, utility structures, steel frameworks, and other exposed structural assemblies. Different diameters and lengths can be supplied to match the connection design, with compatible nuts and washers available for complete fastening assemblies.
Specification:
ASTM A394 Bolts are specified for use in structural and tower assemblies where controlled dimensions, mechanical properties, and corrosion protection are required. Our standard supply focuses on Type 0 and Type 1, with the bolt material and mechanical requirements controlled according to the applicable ASTM A394 requirements. Hot-dip galvanizing provides a protective zinc coating for outdoor service and helps improve resistance to atmospheric corrosion.
Bolts can be supplied in different diameters and lengths to match the connection design. Thread dimensions should be selected to ensure proper engagement with the corresponding nuts, while the galvanized finish, bolt dimensions, and mechanical requirements should be considered together when specifying the complete fastening assembly.
| Item | Specification |
|---|---|
| Product Standard | ASTM A394 |
| Product Type | Hex Head Structural Bolt |
| Head Style | Hex Head |
| Grade | Type0, Type1 |
| Material | Carbon Steel, Alloy Steel |
| Size Range | 1/4"-4" |
| Mechanical Property | ASTM A394 |
| Surface Treatment | Hot Dip Galvanized |
| Packaging: | Boxes/cartons into wooden pallets |
Dimension Chart of A394 Bolts:
The dimension chart provides the key measurements required to select ASTM A394 bolts for structural and tower connections. Nominal diameter and bolt length determine the basic fastening size, while the head dimensions, thread length, and thread configuration should be matched with the corresponding nuts and structural connection. As these bolts are supplied with a hot-dip galvanized finish, the final dimensions and thread fit should also be considered when selecting the complete bolting assembly.
| Thread Diameter | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 | 1-5/8 | 1-3/4 | 1-7/8 | 2 | 2-1/4 | 2-1/2 | 2-3/4 | 3 |
| P | 16 | 13 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 6 | 4.5 | 4.5 | 4 | 4 | 4 |
| ds max | 0.388 | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 | 1.149 | 1.277 | 1.404 | 1.531 | 1.658 | 1.785 | 1.912 | 2.039 | 2.305 | 2.559 | 2.827 | 3.081 |
| ds min | 0.36 | 0.482 | 0.605 | 0.729 | 0.852 | 0.976 | 1.098 | 1.223 | 1.345 | 1.47 | 1.591 | 1.716 | 1.839 | 1.964 | 2.214 | 2.461 | 2.711 | 2.961 |
| s max | 0.688 | 0.875 | 1.062 | 1.25 | 1.438 | 1.625 | 1.812 | 2 | 2.188 | 2.375 | 2.562 | 2.75 | 2.938 | 3.125 | 3.5 | 3.875 | 4.25 | 4.625 |
| s min | 0.669 | 0.85 | 1.031 | 1.212 | 1.394 | 1.575 | 1.756 | 1.938 | 2.119 | 2.3 | 2.481 | 2.662 | 2.844 | 3.025 | 3.388 | 3.75 | 4.112 | 4.475 |
| e max | 0.794 | 1.01 | 1.227 | 1.443 | 1.66 | 1.876 | 2.093 | 2.309 | 2.526 | 2.742 | 2.959 | 3.175 | 3.392 | 3.608 | 4.041 | 4.474 | 4.907 | 5.34 |
| e min | 0.763 | 0.969 | 1.175 | 1.383 | 1.589 | 1.796 | 2.002 | 2.209 | 2.416 | 2.622 | 2.829 | 3.035 | 3.242 | 3.449 | 3.862 | 4.275 | 4.688 | 5.102 |
| k max | 0.268 | 0.364 | 0.444 | 0.524 | 0.604 | 0.7 | 0.78 | 0.876 | 0.94 | 1.036 | 1.116 | 1.196 | 1.276 | 1.388 | 1.548 | 1.708 | 1.869 | 2.06 |
| k min | 0.226 | 0.302 | 0.378 | 0.455 | 0.531 | 0.591 | 0.658 | 0.749 | 0.81 | 0.902 | 0.978 | 1.054 | 1.13 | 1.175 | 1.327 | 1.479 | 1.632 | 1.815 |
| r max | 0.03 | 0.03 | 0.06 | 0.06 | 0.06 | 0.09 | 0.09 | 0.09 | 0.09 | 0.09 | 0.09 | 0.12 | 0.12 | 0.12 | 0.19 | 0.19 | 0.19 | 0.19 |
| r min | 0.01 | 0.01 | 0.02 | 0.02 | 0.02 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.04 | 0.04 | 0.04 | 0.06 | 0.06 | 0.06 | 0.06 |
- RELATED BOLTS LISTS:
- HEX BOLTS
- HEAVY HEX BOLTS
- DIN931 HEX BOLTS
- AS1252 HEX BOLTS
- DIN6914 HEX BOLTS
- ASME B 18.2.1 HEX BOLTS
- A325 HEAVY HEX BOLTS
- A307 HEX BOLTS
- ASTM A354 HEX BOLTS
- A490 HEAVY HEX BOLTS
- ASME B 18.31.5 HRA Hook Bolts
- ASTM A394 HDG Tower Bolts
- ASME B 18.2.1 Square Head Bolts
- ASME/ANSI B 18.5 Round Head Square Neck Bolts
- ASME/ANSI B18.5 T- Head Bolts
- ASME/ANSI B18.2.1 Hex Head Flange Bolts
- ASME/ANSI B18.5 80°Slotted Countersunk Head Bolts
- ASME/ANSI B18.2.1 Hex Cap Bolts
- A307 Hex Head Bolts
- RELATED NUTS LIST:
- HEX NUTS
- HEAVY HEX NUTS
- ISO4032 HEX NUTS
- DIN934 HEX NUTS
- A194 HEAVY HEX NUTS
- A563 HEAVY HEX NUTS
- THREADED ROD LIST:
- DIN975 THREADED RODS
- A193 B7 STUD BOLTS
Application of A394 Steel Transmission Hot Dip Galvanized Tower Bolts:
Transmission Towers & Utility Structures
ASTM A394 Type 0 and Type 1 Bolts are commonly used in transmission towers, distribution structures, and utility steelwork where reliable bolted connections are required for long-term outdoor service. The hot-dip galvanized coating provides additional corrosion protection for exposed structural connections.
Electrical Substations & Power Infrastructure
These galvanized bolts are suitable for substation structures, transformer supports, steel frames, equipment supports, and other power infrastructure. Their standardized inch dimensions allow them to be used with compatible galvanized nuts and washers in structural fastening assemblies.
Communication Towers & Outdoor Steelwork
A394 bolts can also be used in communication towers, antenna support structures, steel platforms, utility frames, and other outdoor fabricated steel assemblies. The combination of structural-grade material and hot-dip galvanizing makes them suitable for connections exposed to weather and atmospheric conditions.