Starrett 54449 O1 Tool Steel Flat Stock 0.5x5x36 in

Product Description

The STARRETT 54449 is an O1 oil-hardening tool steel flat stock bar used in tool and die work, jig and fixture fabrication, punches, dies, and precision gauging applications. Made from AISI Type O1 tool steel, it measures 0.5 inches thick, 5 inches wide, and 36 inches long, with a weight of 25.5 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications that require close dimensional control before heat treatment. This bar ships in a ready-to-machine condition and is intended for use by toolmakers, machinists, and die makers working in job shops, tool rooms, or production facilities.

O1 tool steel flat stock of this size is commonly used in fabricating large blanking dies, forming tools, stripper plates, and machine components where oil-quench hardening will be performed after rough machining. The 5-inch width and 36-inch length provide substantial material for layout and sawing to final shape. Width tolerance is held at 0.000 to minus 0.005 inches, and length tolerance is plus 0.015 inches with no negative deviation. Edge squareness is controlled to 0.003 inches per inch across all edges, supporting accurate layout and setup on surface plates or milling fixtures.

Key Features

• AISI Type O1 oil-hardening tool steel composition for predictable heat treatment response
• Thickness held to plus or minus 0.001 inches for close pre-grind stock allowance
• Edge squareness of 0.003 inches per inch on all edges for accurate layout
• Width tolerance of 0.000 to minus 0.005 inches ensures consistent fitment in tooling slots
• 36-inch length with a plus 0.015 inch length tolerance allows full use of bar with no undersize risk
• Ready-to-machine annealed condition supports direct sawing, milling, and grinding

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar suitable for tool room, die shop, and precision machining applications requiring oil-quench heat treatment after machining.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate cutting fluids and carbide or high-speed steel tooling. Heat treatment, including oil quench hardening and tempering, must be performed by personnel familiar with AISI O1 steel procedures and applicable shop safety requirements. Handle bars of this weight, 25.5 pounds, with appropriate lifting support to avoid injury. Inspect stock for dimensional compliance before layout to confirm it meets drawing tolerances.