Starrett 54358 O1 Tool Steel Flat Stock 7/32x2x36 in

Product Description

The STARRETT 54358 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig construction, and precision machining applications. Ground and held to tight tolerances, it measures 7/32 inch thick, 2 inches wide, and 36 inches long, with a thickness tolerance of +/- 0.001 inches and a length tolerance of +0.015 inches. Manufactured to AISI Type O1 specification, this flat stock is suited for machinists, tool and die makers, and fabricators who require consistent stock material that responds predictably to oil-hardening heat treatment.

O1 tool steel flat stock sees regular use in machine shops and fabrication environments for making punches, dies, gauges, bushings, and general-purpose tooling. The 36-inch bar length provides material for multiple tool blanks from a single piece. The 2-inch width accommodates a broad range of flat tool profiles without requiring additional mill passes. This bar ships in single-piece quantities, making it practical for job shops and maintenance toolrooms that need specific lengths without committing to full bundle orders.

Key Features

• AISI Type O1 oil-hardening tool steel — hardens in oil quench for controlled, predictable heat treat response
• Thickness tolerance held to +/- 0.001 inches for precision fit-up without additional grinding on critical dimensions
• Width tolerance of 0.000 to -0.005 inches ensures stock falls at or under nominal for tight clearance applications
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch bar length yields multiple tool blanks from a single piece of stock
• Weighs 4.46 pounds — manageable for bench handling and vise setup

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock bar suitable for toolmaking, die making, and precision fabrication applications requiring AISI Type O1 material specification.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment including band saws, milling machines, or surface grinders rated for tool steel. Heat treatment — annealing, hardening, and tempering — must follow established metallurgical procedures for AISI O1 and should be performed by qualified personnel with proper quench media and temperature control equipment. Handle cut edges carefully, as tool steel burrs present a laceration hazard. Secure the bar firmly in a vise or fixture before any cutting or grinding operation.