Starrett 57035 O1 Tool Steel Flat Stock 5/8x2x18 in

Product Description

The STARRETT 57035 is an O1 oil-hardening tool steel flat stock bar measuring 0.625 inches thick, 2 inches wide, and 18 inches long. Manufactured to AISI Type O1 specifications, this flat stock is used by machinists, toolmakers, and die makers who need a reliable, dimensionally consistent blank for cutting tools, punches, dies, gauges, and fixtures. O1 tool steel offers good machinability in the annealed state and responds well to oil-quench hardening, making it a practical choice when tight dimensional tolerances and predictable heat-treat results are required. Thickness and width tolerances are held to +0.010 to 0.015 inches, and edge squareness is controlled to 0.003 inches per inch.

This flat stock bar is suited to job shops, toolrooms, and maintenance departments working on both light and heavy fabrication tasks. Typical applications include producing custom punches, die sections, form tools, and wear components in low-to-medium production tooling. The 18-inch length provides enough stock to machine one or more blanks from a single piece with minimal waste. This size is a standard toolroom bar that a machinist can saw, mill, grind, and heat treat on-site without special handling.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance held to +0.010 to 0.015 inches for precise blank sizing
• Width tolerance +0.010 to 0.015 inches and length tolerance +0.250 inches
• Edge squareness controlled to 0.003 inches per inch on all edges
• Ready-to-machine annealed condition suitable for milling, sawing, and grinding
• Single-piece bar format minimizes handling and simplifies inventory

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock blank suitable for general toolroom and die-making applications requiring oil-quench hardenable material in flat bar form.

Installation Notes

Cutting and machining should be performed by qualified machinists using appropriate cutting fluids and tooling rated for tool steel. Heat treating O1 tool steel requires controlled furnace hardening followed by an oil quench and appropriate tempering cycles — this work should be performed by personnel familiar with tool steel heat-treat procedures or by a qualified heat-treat shop. Always allow the bar to reach a stable temperature before precision grinding to final dimensions. Use appropriate personal protective equipment when sawing, milling, or grinding tool steel stock.