Anchor Bolt
Anchor bolts are critical structural fasteners designed to transfer applied loads—including tensile (uplift), shear, and combined stresses—from steel structures or mechanical equipment into reinforced concrete foundations. These bolts function as primary load-transfer elements and must be designed to resist failure modes such as concrete breakout, pull-out, bond failure, and steel yielding in accordance with recognized design codes.
Anchor bolts are critical structural fasteners designed to transfer applied loads—including tensile (uplift), shear, and combined stresses—from steel structures or mechanical equipment into reinforced concrete foundations. These bolts function as primary load-transfer elements and must be designed to resist failure modes such as concrete breakout, pull-out, bond failure, and steel yielding in accordance with recognized design codes.
Types of Anchor Bolts
- L-Type (Bent Anchor Bolt): Commonly used for light to medium-duty applications
- J-Type Anchor Bolt: Provides improved anchorage due to its curved end
- Straight Anchor Bolt with Plate: Includes an anchor plate for heavy-duty applications
- Headed Anchor Bolt: Forged head for strong mechanical anchorage
- U-Type Anchor Bolt: Used for pipe supports and structural fixing
Applicable Codes & Standards
Dimensional & Design Standards:
- ASTM F1554 – Anchor bolts (Grades 36, 55, 105)
- ASME B18.31.2 – Threaded rods and anchor bolts
- ACI 318 – Concrete anchoring design requirements
- AISC Steel Construction Manual (Base Plate Design)
- EN 1992-4 (Eurocode – Anchors in Concrete)
Material Specifications:
- ASTM F1554 (Gr.36 / Gr.55 / Gr.105)
- ASTM A193 (B7 / B7M – for high strength applications)
- ASTM A36 (for general structural use)
Nut & Washer Standards:
- ASTM A194 – Heavy hex nuts
- ASTM F436 – Hardened washers
- ASTM A563 - Heavy hex nuts
- ISO 898-2-Hex Nuts
Typical Specifications
- Diameter Range: M6 to M100 / ¼” to 4”)
- Length As per foundation design and project specification
- Thread Type: UNC / UNF / Metric
- Mechanical Properties:As per ASTM grade requirements
- Embedding Length: As per design load and ACI requirements
- Heat Treatment: per material grade (e.g., quenched & tempered for high strength)
Load Conditions:
- Tensile (pull-out) load
- Shear load
- Combined loading
Finish / Coating:
- PTFE Coated (Blue, Yellow, Red, Green & Black)
- Hot Dip Galvanized
- Yellow Zinc Plated or Cadmium Plated
- Blue Zinc Plated
- Molykote
- Aluminium Zinc Flake Coated
- Black Phosphate
- Zinc Plated
- Nickel Plated
Applications
- Industrial machinery foundations
- Pipe racks and supports
- Equipment base plates
- Power plants, refineries, and heavy industrial facilities
- Offshore platforms and subsea structures
- Rotating equipment foundations (compressors, turbines)
- Petrochemical and refinery units
- Heavy structural columns and pipe racks
- wind energy installations
Key Performance Features
- High load-bearing capacity
- Strong anchorage in concrete foundations
- Resistance to vibration and dynamic loads
- Long-term durability in harsh environments
- Customizable as per design and project requirementss