ASTM F1554 GRADE 36 ANCHOR RODS — TECHNICAL ENGINEERING REPORT AND COMPREHENSIVE DATASHEET
ASTM F1554 Grade 36 is the preferred industry standard for anchor bolts intended for cast-in-place concrete foundations. Unlike legacy specifications (such as ASTM A36 or A307 Grade C), Grade 36 enforces strict mechanical and ductility parameters—including a mandatory minimum 40% Reduction of Area (RA)—ensuring predictable, ductile failure modes that are critical for structural safety in seismic zones and high-load applications.
■ Chemical Composition (Weight %)
The low-carbon chemistry of Grade 36 optimizes ductility and weldability. Manganese is added to larger diameter rods to facilitate solid-solution strengthening.
| Element | Sizes ≤ 3/4" | Sizes > 3/4" to 1-1/2" | Sizes > 1-1/2" to 4" |
|---|---|---|---|
| Carbon (C) max | 0.25% | 0.25% | 0.25% |
| Manganese (Mn) | Optional | 0.60 – 0.90% | 0.60 – 0.90% |
| Phosphorus (P) max | 0.040% | 0.040% | 0.040% |
| Sulfur (S) max | 0.050% | 0.050% | 0.050% |
| Copper (Cu) min* | 0.20% | 0.20% | 0.20% |
*When copper content is specified for atmospheric corrosion resistance.
■ Proprietary Datasheet Download
ASTM F1554 Grade 36 — Complete Technical Yield & Tolerance Datasheet
Contains empirical data for stress simulations, full axial capacity tables, and welding procedure guidance. Corporate/engineering credentials required.
⬇ DOWNLOAD DATASHEET■ Mechanical Properties
Grade 36 provides a lower-yield, highly ductile anchor point, ensuring the steel yields before concrete breakout or bond failure occurs.
| Mechanical Property | Specified Limit |
|---|---|
| Tensile Strength | 58 – 80 ksi (400 – 558 MPa) |
| Yield Strength (min) | 36 ksi (248 MPa) |
| Elongation in 2" (min) | 23% |
| Reduction of Area (min) | 40% |
| Hardness Range | 80 – 101 HRB |
■ Axial Load Capacities (UNC)
Calculated minimum load limits for standard threaded rod configurations.
| Dia (in.) | Stress Area (in²) | Min Tensile (lbf) | Min Yield (lbf) |
|---|---|---|---|
| 1/2" | 0.1419 | 8,200 | 5,100 |
| 3/4" | 0.3340 | 19,400 | 12,000 |
| 1" | 0.6060 | 35,200 | 21,800 |
| 1-1/4" | 0.9690 | 56,200 | 34,900 |
| 1-1/2" | 1.4050 | 81,500 | 50,600 |
■ Manufacturing and Installation Tolerances
| Dimension | Range | Tolerance |
|---|---|---|
| Length (≤ 24") | ≤ 24 inches | ± 1/2" |
| Length (> 24") | > 24 inches | ± 1" |
| Thread Length | — | +1", -0" |
| Bend Angle | Bent Hooks | ± 5° |
■ Engineering Notes
- Weldability: Grade 36 is inherently weldable. For projects requiring substitute Grade 55, ensure the material meets Supplementary Requirement S1 to prevent HAZ embrittlement.
- Reduced Diameter Shanks: Thread rolling produces reduced-diameter shanks. Ensure your structural analysis accounts for the lower section modulus (bending resistance) compared to cut-thread full-diameter rods.
- Reuse Prohibition: Anchor bolts must never be reused. They are designed for one-time installation; once tensioned or bent into place, their ductility reserve is exhausted.
- Torque Guidelines: ASTM F1554 does not define torque values. Preloads must be calculated by the Engineer of Record based on specific foundation and joint requirements.
