Atlanta Rod & Manufacturing is an established American manufacturer of standard finished domestic hex bolts, heavy structural fasteners, and custom metric fasteners. Produced directly at our Lavonia, Georgia plant, our domestic fasteners are built for contractors, steel fabricators, and OEMs needing certified Build America, Buy America (BABA) Act and American Iron and Steel (AIS) compliance. Every shipment is accompanied by complete certified domestic Mill Test Reports (MTRs) documenting melt and manufacturing origin in the USA.
Domestic Bolts & Georgia Construction Fasteners Manufacturing
As a leading producer of Georgia construction fasteners and nationwide infrastructure hardware, Atlanta Rod manufactures standard finished hex bolts engineered to tight dimensional and metallurgical tolerances. Hex bolts feature a hexagonal head designed to be driven with a standard wrench or socket. Ideal for steel framing, timber construction, precast concrete connections, and equipment fabrication, our domestic manufacturing spans diameters from 3/8” to 4” in both imperial and metric configurations.
Hex Bolt Dimensions, Thread Pitch & ASME B18.2.1 Specifications
Finished hex bolts are manufactured in strict compliance with ASME B18.2.1. Compared to heavy hex profiles, standard hex bolts have slightly narrower head widths across flats, making them suitable for standard clearance applications where space and weight constraints require a compact fastener head. For oversized bearing area applications, view our heavy hex bolt dimensions and spec tables.
| Nominal Diameter (in) | Body Diameter Max (in) | Width Across Flats F (in) | Width Across Corners G (in) | Head Height H (in) | Thread Pitch (TPI UNC / UNF) |
|---|---|---|---|---|---|
| 3/8" (0.375) | 0.388 | 9/16 (0.562) | 0.650 | 15/64 (0.234) | 16 UNC / 24 UNF |
| 1/2" (0.500) | 0.515 | 3/4 (0.750) | 0.866 | 5/16 (0.312) | 13 UNC / 20 UNF |
| 5/8" (0.625) | 0.642 | 15/16 (0.938) | 1.083 | 25/64 (0.391) | 11 UNC / 18 UNF |
| 3/4" (0.750) | 0.768 | 1-1/8 (1.125) | 1.299 | 15/32 (0.469) | 10 UNC / 16 UNF |
| 7/8" (0.875) | 0.895 | 1-5/16 (1.312) | 1.516 | 35/64 (0.547) | 9 UNC / 14 UNF |
| 1" (1.000) | 1.022 | 1-1/2 (1.500) | 1.732 | 39/64 (0.609) | 8 UNC / 14 UNF |
| 1-1/8" (1.125) | 1.149 | 1-11/16 (1.688) | 1.949 | 11/16 (0.688) | 7 UNC / 12 UNF |
| 1-1/4" (1.250) | 1.277 | 1-7/8 (1.875) | 2.165 | 25/32 (0.781) | 7 UNC / 12 UNF |
| 1-1/2" (1.500) | 1.531 | 2-1/4 (2.250) | 2.598 | 15/16 (0.938) | 6 UNC / 12 UNF |
| 1-3/4" (1.750) | 1.789 | 2-5/8 (2.625) | 3.031 | 1-3/32 (1.094) | 5 UNC |
| 2" (2.000) | 2.044 | 3" (3.000) | 3.464 | 1-1/4 (1.250) | 4.5 UNC |
Metric Fasteners & Standard Domestic Hex Bolt Capabilities
To support global infrastructure, international equipment assemblies, and advanced manufacturing, Atlanta Rod manufactures precision metric fasteners in property classes 4.6, 8.8, 10.9, and stainless grades A2/A4. Conforming to DIN 931 / ISO 4014 dimensional specs, our metric bolt capabilities ensure domestic sourcing for equipment requiring metric hardware.
| Metric Thread Size | Standard Pitch (mm) | Body Diameter Max (mm) | Width Across Flats (mm) | Head Height (mm) | Tensile Strength Class 8.8 (MPa / psi) |
|---|---|---|---|---|---|
| M10 | 1.50 | 10.00 | 16.00 | 6.40 | 800 MPa (116,000 psi) |
| M12 | 1.75 | 12.00 | 18.00 | 7.50 | 800 MPa (116,000 psi) |
| M16 | 2.00 | 16.00 | 24.00 | 10.00 | 800 MPa (116,000 psi) |
| M20 | 2.50 | 20.00 | 30.00 | 12.50 | 800 MPa (116,000 psi) |
| M24 | 3.00 | 24.00 | 36.00 | 15.00 | 800 MPa (116,000 psi) |
| M30 | 3.50 | 30.00 | 46.00 | 18.70 | 800 MPa (116,000 psi) |
| M36 | 4.00 | 36.00 | 55.00 | 22.50 | 800 MPa (116,000 psi) |
| M42 | 4.50 | 42.00 | 65.00 | 26.00 | 800 MPa (116,000 psi) |
| M48 | 5.00 | 48.00 | 75.00 | 30.00 | 800 MPa (116,000 psi) |
ASTM A307 Specifications & Precision Rolled Threads
Atlanta Rod manufactures standard hex bolts conforming to ASTM A307 specifications:
- ASTM A307 Grade A: General purpose carbon steel bolts, studs, and threaded rods with a minimum tensile strength of 60,000 psi (414 MPa), widely specified for light structural joints and mechanical assemblies.
- ASTM A307 Grade B: Heavy hex and finished hex bolts for piping flanges and cast iron applications with tensile strength ranging from 60,000 to 100,000 psi.
- Precision Rolled Threads: Our in-house manufacturing utilizes continuous die thread rolling rather than cut threading. Rolled threads preserve the unbroken metallurgical grain structure of the steel bar stock, yielding superior burnished surface finishes, improved fatigue life, and high resistance to thread stripping under load.
| Property | ASTM A307 Grade A | ASTM A307 Grade B | ASTM A449 (High Strength) |
|---|---|---|---|
| Tensile Strength, min | 60,000 psi (414 MPa) | 60,000 – 100,000 psi | 90,000 – 120,000 psi |
| Yield Strength, min | N/A (Reference) | N/A (Reference) | 58,000 – 92,000 psi |
| Elongation in 2", min | 18% | 18% | 14% |
| Hardness (Rockwell) | 69 – 100 HRB | 69 – 95 HRB | 25 – 34 HRC |
| Finish Options | Plain, Hot-Dip Galvanized, Zinc | Plain, Hot-Dip Galvanized, Zinc | Plain, Hot-Dip Galvanized, Zinc |
AIS & Build America Buy America Domestic Compliance
Every domestic bolt and threaded fastener manufactured by Atlanta Rod complies 100% with:
- Build America, Buy America (BABA) Act: Sourced exclusively from domestic steel mills and manufactured entirely in the USA.
- American Iron and Steel (AIS) Mandate: Full domestic forging, heat treating, and threading compliance for municipal infrastructure.
- Certified Mill Test Reports (MTRs): Shipped with each order, providing complete heat lot verification and chemical/tensile traceability.
Related Domestic Fasteners & Structural Products
In addition to standard hex bolts, Atlanta Rod manufactures a complete family of domestic structural fasteners:
- Explore our heavy-duty heavy hex bolts for flanged piping, bridge structures, and high-pressure connections.
- Buy domestic stainless fasteners in grades 304, 316, and high-performance B8M.
- Review engineering details on high-strength A354 BC alloy bolts and studs.
- Specify high-temperature and marine bolting including ASTM A193 B8M and Inconel fasteners.
Looking for custom sizes, domestic certifications, or emergency delivery? Contact Atlanta Rod today at 800-633-9794 or send your drawings to Sales@ATLROD.com for an expedited quote.