Starrett 54397 O1 Tool Steel Flat Stock 5/16x2x36 in

Product Description

The STARRETT 54397 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5/16 inch thick, 2 inches wide, and 36 inches long, and weighs 6.38 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications where dimensional consistency is critical before heat treatment. Machinists and tool and die makers work this material in the annealed state, then oil-quench harden to achieve the desired hardness. Edge squareness is rated at 0.003 inches per inch across all edges.

O1 tool steel flat stock is used in the fabrication of cutting tools, punches, dies, gauges, and jigs where a tough, hardenable steel with predictable dimensional behavior is required. This bar is appropriate for both job shop and production toolroom environments. It arrives in the soft annealed condition, ready for machining prior to hardening. Width tolerance is held to -0.000 to -0.005 inches, and length tolerance is +0.015 inches, giving machinists a consistent starting blank for layout and stock removal.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable heat treat response
• Thickness tolerance: +/- 0.001 inches for consistent blank dimensioning
• Width tolerance: -0.000 to -0.005 inches
• Length tolerance: +0.015 inches
• Edge squareness: 0.003 inches per inch on all edges
• Supplied in annealed condition — ready for machining before hardening

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolroom use in die making, punch fabrication, gauge production, and similar precision metalworking applications.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed with appropriate machine guarding and personal protective equipment per shop safety standards. All heat treating operations — including hardening and tempering — should be performed by qualified personnel following established metallurgical procedures for AISI O1 tool steel. Deburr all edges after machining and before handling. Do not attempt to harden without proper quench media and temperature control equipment.