Square Bar

Atlantic Stainless supplies high-quality stainless steel square bar in a variety of grades, sizes, and finishes to meet your fabrication, machining, and structural needs. Available in both hot-rolled and cold-drawn forms, stainless square bar is valued for its strength, corrosion resistance, and versatility across a range of industries.

We stock standard lengths and offer cut-to-length services, polishing, and machining. Whether you need tight-tolerance bars for a precision application or general-purpose bars for fabrication, we have the inventory and expertise to deliver.

Common Applications

Stainless steel square bar is suitable for a wide variety of commercial, industrial, and architectural uses, including:

• Fabrication & Machining
• Construction
• Automotive & Aerospace
• Architectural Design
• Food & Beverage Processing
• Marine & Coastal Use

Available Stainless Steel Grades

• Grade: 303 Key Features: Excellent machinability, non-seizing Typical Uses: Machined parts, fasteners, bushings
• Grade: 304 Key Features: Corrosion-resistant, weldable, all-purpose Typical Uses: Structural, architectural, general fabrication
• Grade: 304L Key Features: Low carbon for improved weldability Typical Uses: Welded frames, food-grade fabrication
• Grade: 316 Key Features: Molybdenum for superior corrosion resistance Typical Uses: Marine, chemical processing, coastal environments
• Grade: 316L Key Features: Lower carbon for welding in chloride-rich environments Typical Uses: Pharmaceutical, medical, marine hardware
• Grade: 17-4 PH Key Features: High-strength precipitation-hardening stainless Typical Uses: Aerospace, energy, high-load applications

Finish Options

Hot Rolled: Scaled surface, suitable for structural and industrial use Best For: Structural applications, machining stock
Cold Drawn: Smooth finish, tighter tolerances Best For: Machining, precision applications
Polished (180–320 grit): Aesthetic or sanitary finish Best For: Architectural, medical, food-grade uses
Pickled & Passivated: Chemically cleaned to improve corrosion resistance Best For: Sanitary, chemical processing, marine environments

Tolerances & Size Range

• Standard Sizes: 1/8” to 4” square; larger sizes available on request
• Length Options: 12′ standard; custom cut lengths available
• Tolerance: ASTM A276/A484 standards; tighter tolerances on request
• Edge Condition: Square corners; sharp or radius corners per spec
• Processing: Saw cutting, chamfering, polishing, drilling available

Start Your Order Today

Looking for custom dimensions or a specific finish for your next project? Whether you need a precise size, unique finish, or tailored specifications, our experienced team is here to guide you every step of the way. We specialize in sourcing the exact stainless steel square bar you need to ensure your project meets the highest standards. Let us help bring your vision to life! Request a quote today.

Available Stainless Steel Square Bar Grades

• 304/304L, 316/316L, 303, 317L 321, 347, 410, 416, 440C, 2205, 17-4 and more! View our Line Card here.
• We will custom saw cut to length and sell less than full lengths in some sizes
• Polishing services are available