3003 H24 aluminum sheet 0.125 inch for bending
When your fabrication project calls for a material that bends cleanly, holds its shape, and resists corrosion without breaking the bank, 3003 H24 aluminum sheet in 0.125 inch (1/8″) thickness is the answer. This combination of alloy, temper, and gauge has become a staple in metal fabrication shops across North America—from custom sign makers and HVAC contractors to trailer manufacturers and industrial equipment builders. At Gwangyang Aluminum (GYAL), we produce premium 3003 H24 aluminum sheet that delivers consistent bending performance, tight dimensional tolerances, and IATF-certified quality. In this guide, we’ll explain why 0.125″ 3003 H24 is the go‑to choice for bending applications and how to get the best results from your press brake.
What is 3003 H24 Aluminum Sheet?
3003 is a non‑heat‑treatable aluminum‑manganese alloy (1.0–1.5% Mn). It offers excellent corrosion resistance, good workability, and moderate strength—making it one of the most versatile alloys for general fabrication.
The H24 temper indicates the material has been strain‑hardened and then partially annealed (stabilized). This unique processing provides:
High strength (very close to H14 temper)
Reduced internal stress compared to H14
Improved dimensional stability after bending
Better resistance to springback than fully hard tempers
When combined with 0.125 inch (3.175 mm) thickness, you get a sheet that is rigid enough for structural applications yet thin enough to bend on standard shop equipment.
Key Mechanical Properties (Typical for GYAL 3003 H24)
| Property | Value | Why It Matters for Bending |
|---|---|---|
| Tensile Strength | 145 – 185 MPa | Good overall strength for finished parts |
| Yield Strength | 105 – 135 MPa | Moderate yield allows forming without excessive force |
| Elongation | 8 – 16% | Sufficient ductility for tight radius bends |
| Hardness | 45 – 55 HB | Resists scratching, yet not brittle |
| Minimum Bend Radius (90°) | 1.0 – 1.5 × thickness | Can bend to 1/8″ inside radius reliably |
Because of the partial anneal, H24 offers better bendability than H14 (same strength level) and more stable springback than H18. For 0.125″ sheet, a bend radius of 0.125″ to 0.190″ is achievable across the grain.
Why Choose 0.125″ 3003 H24 for Bending Applications?
1. Perfect Balance of Strength and Ductility
At 0.125″ thick, 3003 H24 is neither too soft (which causes wrinkling) nor too hard (which causes cracking). It forms crisp, accurate bends on a press brake, folder, or roll former.
2. Excellent Springback Control
The H24 temper’s stabilized structure reduces unpredictable springback. You can rely on consistent bend angles without constant trial‑and‑error adjustments—saving setup time and scrap.
3. Great for Multiple Bend Operations
Whether you’re making chassis brackets, enclosure panels, ductwork flanges, or sign frames, 0.125″ 3003 H24 handles sequential bends without work hardening to failure.
4. Superior Corrosion Resistance
Unlike steel, 3003 aluminum won’t rust. It naturally forms a protective oxide layer, making it ideal for outdoor signage, truck components, and building products exposed to moisture.
5. Cost‑Effective Alternative to 5052 or 6061
For non‑structural bending applications where ultimate strength isn’t required, 3003 H24 offers significant cost savings over marine‑grade or heat‑treated alloys.
Recommended Bending Practices for 3003 H24 0.125″ Sheet
To achieve professional, crack‑free bends with GYAL 3003 H24, follow these industry‑proven guidelines:
Tooling Selection
Die opening (V‑width): Use 6–8× material thickness. For 0.125″ sheet, a 0.75″ to 1.0″ V‑die works well.
Punch radius: Minimum inside bend radius of 0.125″ to 0.190″ . A sharper punch may cause micro‑cracking on the outside of the bend.
Material: Polished, hardened steel tooling reduces friction and prevents galling.
Bend Direction
Bend perpendicular to rolling direction for the tightest possible radius and lowest risk of cracking.
Bend parallel to rolling direction requires a slightly larger radius (add 25–50%). Plan your nest layout accordingly.
Lubrication
Light lubricant (e.g., WD-40, light oil, or wax) reduces friction and improves bend consistency. Not strictly required for air bending, but helpful for bottoming or coining.
Press Brake Settings
Use air bending for most applications. Calculate bend allowance using a K‑factor of approximately 0.33–0.40 for 3003 H24.
For high‑volume production, consider bottom bending with a matched punch and die for perfect angle repeatability.
Avoid Common Mistakes
| Mistake | Consequence | Solution |
|---|---|---|
| Too sharp a punch | Cracking on outside radius | Use punch radius ≥ material thickness |
| Narrow V‑die | Excessive tonnage, marks on part | Use V‑width 8× thickness |
| Bending against grain | Rougher surface, higher springback | Orient bends perpendicular to rolling direction |
| No lubrication | Galling, scratches | Apply light oil or wax |
Applications Where 0.125″ 3003 H24 Shines
Thanks to its excellent bending characteristics, this material is used across many industries:
| Industry | Typical Parts |
|---|---|
| Signage | Channel letters, sign frames, light boxes |
| Transportation | Trailer side panels, mud flaps brackets, tool boxes |
| HVAC | Ductwork flanges, access doors, plenum boxes |
| General Fabrication | Equipment guards, machine enclosures, shelving |
| Architectural | Decorative trim, ceiling panels, kick plates |
Why Source 0.125″ 3003 H24 from Gwangyang Aluminum?
IATF 16949 Certified Consistency
Every sheet of GYAL 3003 H24 is produced under strict automotive‑grade quality controls. You get uniform mechanical properties—same yield strength, same elongation, same bend behavior—from one order to the next.
Superior Flatness and Surface Quality
Our tension leveling and precision rolling eliminate coil set and oil‑canning. The mill finish is clean and uniform, ready for painting, anodizing, or direct use.
Mill‑Direct Pricing, FOB Korea or CIF
Save on middleman markups. We offer competitive pricing for full container loads and flexible trade terms.
Technical Support
Our team can provide bend allowance charts, sample material for process validation, and guidance on tooling selection.
Frequently Asked Questions
Q: Can I bend 0.125″ 3003 H24 to a 90° angle with a 1/8″ radius?
Yes. With the bend perpendicular to the rolling direction, a 1/8″ inside radius is achievable. For bends parallel to rolling, increase radius to 3/16″.
Q: Does 3003 H24 require annealing before bending?
No. H24 is already stabilized for optimal forming. Never anneal it unless you plan to fully soften to O temper—which would reduce strength by more than half.
Q: How does 3003 H24 compare to 5052 H32 for bending?
5052 H32 is stronger and more corrosion‑resistant, but it requires a larger bend radius (≈2× thickness) and costs more. For most interior and mild outdoor applications, 3003 H24 is the better value.
Q: Can I weld 3003 H24 after bending?
Yes. Use 4043 or 5356 filler with GMAW (MIG) or GTAW (TIG). The heat‑affected zone will soften, so design reinforcements if the weld area carries heavy load.
Conclusion
For fabricators seeking a reliable, cost‑effective aluminum sheet that bends beautifully without cracking, 3003 H24 aluminum sheet in 0.125 inch thickness is the ideal choice. Its balanced strength, excellent springback control, and corrosion resistance make it a workhorse material for countless bending applications.
When you partner with Gwangyang Aluminum, you receive IATF‑certified quality, consistent mechanical properties, and responsive support—ensuring every bend meets your specifications.
Ready to try GYAL 3003 H24 0.125″ sheet for your next bending project?
Contact us today for a competitive quote, request a sample for testing, or ask for our detailed bend allowance calculator.
