STRUCTURAL STEEL TUBING
Structural Steel Tubing Supplier – Built for Strength and Performance
MB Metals is a leading supplier of ERW structural steel tubing, including square, rectangular, and round Hollow Structural Sections (HSS) that meet ASTM A500 Grades A, B, and C. Known for its strength, load-bearing capacity, and corrosion resistance, structural steel tubing is the go-to choice for large-scale construction and infrastructure applications.
We stock a full range of sizes and finishes, including galvanized and primer-coated tubing, all sourced from trusted mills across the globe and warehoused for fast delivery across the Western U.S.
- ASTM A500 certified tubing
- Cut-to-length service available
- Galvanized and primer-coated finishes
Product Specifications – Structural Tubing
ASTM A500 (Grades A, B, C)
All tubing includes mill test reports for certification and traceability
Finish Options:
- Black (uncoated)
- Red, blue, or grey primer-coated
- In-line galvanized
- Hot-dipped galvanized (limited availability)
Square & Rectangular Structural Tubing
- Outside Dimensions: 2″ x 2″ up to 12″ x 12″
- Wall Thicknesses: .120″, .180″, .188″, .250″, .313″, .375″, .500″
- Lengths: 20′, 24′, 40′, 48′ or customer-specified
Round Structural Tubing
- Diameter Range: 2″ up to 12″
- Wall Thicknesses: .120″, .180″, .188″, .250″, .313″, .375″, .500″
- Lengths: 20′, 24′, 40′, 48′ or customer-specified
Square and Rectangular Tubing Size Chart
| Outside Dimension | Nominal Wall Thickness/Gauge | |||||||
|---|---|---|---|---|---|---|---|---|
| Square | Rectangle | .120″ | .180″ | .188″ | .250″ | .313″ | .375″ | .500″ |
| 2″ x 2″ | x | x | x | x | ||||
| 2-1/2″ x 2-1/2″ | 3″ x 2″ | x | x | x | x | |||
| 3″ x 3″ | 4″ x 2″ | x | x | x | x | |||
| 3-1/2″ x 3-1/2″ | 4″ x 3″ | x | x | x | x | |||
| 4″ x 4″ | 5″ x 3″ | x | x | x | x | |||
| 6″ x 3″ | x | x | x | |||||
| 5″ x 5″ | 6″ x 4″ | x | x | x | x | |||
| 6″ x 6″ | 8″ x 4″ | x | x | x | x | x | x | |
| 7″ x 7″ | 8″ x 6″ | x | x | x | x | x | x | |
| 8″ x 8″ | 10″ x 6″ | x | x | x | x | x | x | |
| 10″ x 10″ | x | x | x | x | ||||
| 12″ x 12″ | x | x | x | x | ||||
Structural Tubing Gallery
Let’s Get You the Right Steel Product – Fast.
Whether you know exactly what you need or you’re comparing specs, our team is here to help. Get a fast quote, check availability, or ask a technical question — and we’ll respond promptly.