High-Performance Stainless Steel Square Bars for Machining

Cold Finished and Annealed Stainless Steel Square Bars in Stock

Action Stainless supplies stainless steel square bar in a wide range of sizes to support machining, framing, and structural applications. This bar type is valued for its strength, dimensional stability, and surface quality across both industrial and architectural environments.


We stock cold finished and annealed square bars in 303, 304, 316, and 416 grades. These bars are typically supplied in 12′ lengths and are ideal for shafts, brackets, and structural supports. Custom cut-to-length and fast turnaround options are available to meet both short-run and high-volume project needs. T416 square bar is typically available within 2 to 3 days ARO for expedited delivery.

Finishes & Processing Services

Stainless square bars are typically cold finished to provide a smooth surface and consistent dimensions. Annealing is performed to relieve stress, control hardness, and reduce tool wear during machining.

In-house processing services include saw cutting, bar turning, grinding, and chamfering. Material can be supplied in full bars or cut-to-length based on your production needs.

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Available Styles and Materials

We stock stainless square bar in:

  • 303 Stainless Square Bar

    Free-machining bar used for threaded parts, fittings, and turned components.

  • 304/304L Stainless Square Bar

    Versatile bar for bracing, supports, and architectural trim in corrosive or welded environments.

  • 316/316L Stainless Square Bar

    Better corrosion protection for marine, chemical, or food service applications.

  • 416 Stainless Square Bar

    Hardenable stainless for screw machines, bushings, and high-speed machined parts. Stocked for fast delivery.

  • Cold Finished and Annealed Bar

     Smooth-surfaced square bar ideal for precise machining and structural applications.

Square bar is typically stocked in 12′ lengths. Custom sizes, finishes, and cut-to-length options are available.

Stainless Steel Square Bar Specifications

Stainless products used in square bar fabrication are available in the following specifications:

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Grades Offered: 303, 304/304L, 316/316L, and 416: Selected for machinability, corrosion resistance, and clean surface finish.

Black and white triangle with a smaller white triangle inside.

Product Forms: Cold finished or hot rolled square bar. Stocked in standard 12′ lengths with cut-to-length available.

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Finishes: Cold drawn and annealed standard. Hot rolled, ground, or polished options available upon request.

Black triangle with white border pointing right on white background.

Processing Capabilities: Saw cutting, grinding, chamfering, and bar turning. Quick turnaround for small or large runs.

These options meet the needs of structural machining, framing, alignment, and bracket fabrication across industries.

Stainless Steel Square Bar Applications

Stainless steel square bar is commonly used in:

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Machined Parts & Bushings: Used for small machined components, connectors, and parts requiring repeatable accuracy.

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Bracing & Framing: Applies to supports, welded braces, and modular frame systems for equipment or architecture.

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Food & Marine Fixtures: Provides strength and corrosion protection in exposed environments and clean settings.

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Turned & Threaded Components: Supports screw machines, thread cutting, and custom bolt or spacer production.

Black triangle with white border pointing right.

Custom Fabrication & Tools: Used in jigs, shafts, blocks, and general-purpose projects that require square-section strength.