Steel Weight Calculator

Standard Hook Lengths

ACI 318 (Imperial):

• Standard Hook: 6×bar diameter
• Minimum Hook: 6 inches
• 90° Hook: 12×bar diameter
• 180° Hook: 4×bar diameter + bend

IS 456:2000 (Metric):

• Standard Hook: 9×bar diameter
• Minimum Hook: 150 mm
• 90° Hook: 8×bar diameter
• 135° Hook: 6×bar diameter

When to Use Custom Hook Lengths

• Special Designs: Non-standard structural requirements
• Local Codes: Regional building code variations
• Fabrication Practices: Specific shop bending standards
• Material Constraints: Limited bar lengths available
• Seismic Zones: Special hook requirements in high seismic areas
• Project Specifications: Engineer's specific requirements

Note: Always consult structural drawings and local codes before using custom hook lengths.

Hook Length Impact on Weight

Formula for Hook Contribution:

Total Bar Length = Straight Length + 2×Hook Length

Example (16mm bar, 20ft length):

Key Insight: Hook lengths can increase total steel weight by 3-7% depending on bar diameter and hook specification.