Nova Steel stocks 3.5×3.5 square steel tubing with a 0.250″ wall, manufactured to ASTM A500. At 8.58 lbs/ft and available in 24-ft standard lengths, this size is ready to ship and can be cut to your exact specification. Request a quote in under a minute, with your grade, size, and wall pre-filled.
3.5×3.5 Square Tubing Specifications, ASTM A500
| Grade | ASTM A500 |
| Shape | Square |
| Nominal size | 3.5×3.5 |
| Wall thickness | 0.250″ |
| Outside diameter (OD) | 3.5″ |
| Inside diameter (ID) | 3 |
| Weight per foot | 8.58 lbs/ft |
| Standard length | 24 ft |
| Cut-to-length | Yes |
| Surface finish | Mill finish |
| Min. yield strength | 46 ksi |
| Min. tensile strength | 58 ksi |
About ASTM A500
ASTM A500 is a standard specification for cold-formed welded and seamless carbon steel structural tubing in rounds, squares, rectangles, and special shapes. Widely used in structural applications including columns, frames, and supports.
This size meets ASTM A500 requirements with a minimum yield strength of 46 ksi and minimum tensile strength of 58 ksi. View the full ASTM A500 standard.
Common Applications
3.5×3.5 square tubing in ASTM A500 is commonly used for: Structural columns, building frames, guardrails, agricultural equipment, machinery frames, sign structures.
Square tubing is commonly used in structural framing where uniform load distribution and clean weld joints matter, including building frames, equipment supports, machinery bases, and architectural elements where appearance is visible.
Order 3.5×3.5 Square Tubing
This size is in stock at Nova Steel. We supply A500 tubing to fabricators, contractors, and OEMs, with cut-to-length service and fast quoting. Tell us your length and quantity, and we’ll send pricing and lead time.
Frequently Asked Questions
What is 3.5×3.5 square steel tubing used for?
3.5×3.5 square tubing in ASTM A500 is used for Structural columns, building frames, guardrails, agricultural equipment, machinery frames, sign structures. Square tubing is commonly used in structural framing where uniform load distribution and clean weld joints matter, including building frames, equipment supports, machinery bases, and architectural elements where appearance is visible. Nova Steel supplies this size to fabricators, contractors, and OEMs across structural and mechanical applications.
What is the weight of 3.5×3.5 square tubing with a 0.250″ wall?
3.5×3.5 square steel tubing with a 0.250″ wall weighs 8.58 lbs per foot. A standard 24-ft length weighs approximately 205.9 lbs.
Can I order 3.5×3.5 square tubing cut to a custom length?
Yes. Nova Steel offers cut-to-length service on 3.5×3.5 ASTM A500 square tubing. Submit your length and quantity through the quote form above, and we’ll respond with pricing and lead time.
What’s the difference between ASTM A500 and A513 for square tubing?
ASTM A500 and A513 are both common specifications for square steel tubing, but they serve different purposes. ASTM A500 is a structural specification with defined minimum yield and tensile strengths, used primarily in load-bearing applications like framing and columns. ASTM A513 is a mechanical tubing specification focused on dimensional precision and surface finish, used in applications where tight tolerances matter more than structural strength ratings. For 3.5×3.5 square tubing, Nova Steel supplies the A500 specification described on this page; contact us if you need A513 in the same size.
Is 3.5×3.5 square tubing with a 0.250″ wall available?
Yes. 3.5×3.5 ASTM A500 square tubing with a 0.250″ wall is a stocked size at Nova Steel, available in 24-ft standard lengths and cut-to-length on request. Standard lead time for cut orders is typically same-day to 2 business days depending on quantity. Submit the quote form for current availability and pricing.
