Hot Rolled Steel Flat Bar - 4-1/2 Inch X 3/8 Inch
A36 Hot Rolled Steel Flat Bar - 4-1/2" x 3/8" x 20'
This 4-1/2" x 3/8" hot rolled flat bar is an A36 structural carbon steel with excellent weldability and formability. Conforming to ASTM A36, it offers reliable strength for heavy-duty fabrication, structural supports, and base plates. In stock Los Angeles.
- A36 Carbon Steel Construction
- ASTM A36 Certified
- 58,000-80,000 PSI Tensile Strength
- Excellent Weldability & Formability
A36 hot rolled steel is a low-carbon steel alloy produced to ASTM A36 standards, ensuring a minimum yield strength of 36,000 PSI. The hot rolling process gives it a distinctive blue-grey mill scale finish and slightly rounded edges. This material is known for its excellent weldability using all common methods, good machinability, and superior ductility, making it easy to form and fabricate.
As a large-sized profile, this 4-1/2" wide flat bar provides substantial strength and a large surface area, making it ideal for machinery base plates, heavy structural supports, trailer frames, and other robust fabrications where load-bearing capacity and durability are primary requirements. Its thickness offers rigidity against bending and torsion.
Specifications
- Material: A36 Carbon Steel
- Standards: ASTM A36
- Strength/Tensile: 58,000-80,000 PSI
- Dimensions: 4-1/2" Width x 3/8" Thickness x 20' Length
- Finish: Hot Rolled (Mill Finish)
- Certifications: Mill Test Report (MTR) Available
Applications
- Structural Fabrication: Base plates for columns and equipment - provides a solid, weldable foundation.
- Heavy Equipment: Frame components and mounting brackets - withstands high loads and vibration.
- Transportation: Trailer cross-members and chassis reinforcements - delivers strength and impact resistance.
- Industrial Maintenance: Wear strips and heavy-duty repair patches - offers a durable and cost-effective solution.
Target Users
Fabricators, welders, construction contractors, and heavy equipment manufacturers rely on A36 flat bar for its strength and versatility in projects throughout the Los Angeles area.
Finish Options
This product comes standard with a hot rolled (mill) finish, characterized by a blue-grey, scaly surface and slightly rounded edges. This protective scale can be removed by grinding, sandblasting, or pickling for painting or coating. Contact our Los Angeles sales team for custom finish inquiries.
How to Measure
Flat bar is measured by its Width (A) and Thickness (B). Use a tape measure or calipers for an accurate measurement of the rectangular cross-section.
Example: To order this flat bar, specify "A36 Hot Rolled Flat Bar, 4-1/2 Inch by 3/8 Inch".
Order Checklist
- Product name and required dimensions (4-1/2" x 3/8")
- Material specification and quantity (in feet)
- Confirm grade (A36) meets structural requirements
- Surface finish requirements (Hot Rolled)
- Certifications required (Mill Test Report)
- Custom cutting or delivery requirements
Quick Facts
- Product
- Hot Rolled Steel Flat Bar - 4-1/2 Inch X 3/8 Inch
- Material
- A36 Carbon Steel
- Standards
- ASTM A36
- Key Properties
- 36,000 PSI yield, excellent weldability, good formability
- Primary Applications
- Base plates, structural supports, frame components
- Location
- Los Angeles warehouse - Same-day pickup available
Available Sizes
We stock A36 Hot Rolled Flat Bar in widths from 1/2" to 12" and thicknesses from 1/8" to 2". This 4-1/2" x 3/8" size is available for immediate pickup in Los Angeles.
Custom cutting services available.
View All Sizes