Starrett 54433 O1 Tool Steel Flat Stock 7/16x2-1/2x36 in

Product Description

The STARRETT 54433 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured from AISI Type O1 oil-hardening tool steel, this bar measures 7/16 inch thick, 2-1/2 inches wide, and 36 inches long, with a weight of 11.16 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications that demand close dimensional control. Machinists, tool and die makers, and metalworking shops use this stock to fabricate punches, dies, gauges, fixtures, and cutting tools that will be heat-treated after machining. O1 steel machines cleanly in the annealed state and responds predictably to oil-quench hardening.

This flat stock is intended for professional metalworking environments where a reliable, consistently toleranced tool steel bar is required before heat treatment. Typical applications include fabricating blanks for cutting tools, jigs, mold components, and precision flat tooling. The 36-inch length provides a standard working bar from which multiple parts can be laid out and cut. Length tolerance is held to +0.015 inches with no negative allowance, and width tolerance runs from 0.000 to -0.005 inches, ensuring the stock fits within standard machined allowances. Edge squareness is rated at 0.003 inches per inch on all edges.

Key Features

• AISI Type O1 oil-hardening tool steel — machines in annealed state, hardens with oil quench
• Thickness held to +/- 0.001 inches for precision blanking and toolmaking work
• Width tolerance: 0.000 to -0.005 inches; length tolerance: +0.015 inches
• Edge squareness: 0.003 inches per inch on all edges
• Standard 36-inch bar length supports multi-part layout and cut-off operations
• Weighs 11.16 pounds per bar — suitable for heavy tooling blanks

Compatibility

Designed as a standard AISI Type O1 oil-hardening flat bar for general toolmaking, die fabrication, and precision metalworking applications requiring a hardenable tool steel in the annealed condition.

Installation Notes

Cutting, grinding, and machining should be performed while the bar is in the annealed state before any heat treatment. Follow the tool steel supplier's recommended hardening and tempering procedures for AISI O1 material. Wear appropriate personal protective equipment when sawing or grinding tool steel. Heat treatment of O1 steel should be performed by qualified personnel using proper atmosphere-controlled or neutral-salt equipment to avoid decarburization.