Starrett 54216 O1 Tool Steel Flat Stock 1x3x18 in

Product Description

The STARRETT 54216 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 1 inch thick, 3 inches wide, and 18 inches long, and weighs approximately 15.3 pounds. The tight thickness tolerance of plus or minus 0.001 inches makes it well-suited for applications where dimensional accuracy directly affects the finished tool or workpiece. Licensed machinists, tool-and-die makers, and metalworking professionals select O1 flat stock for its predictable heat-treat response and consistent pre-hardened dimensions.

O1 oil-hardening tool steel flat stock is a standard material in toolroom environments, both in job shops and in-house maintenance departments. This bar is appropriate for fabricating punches, dies, gauges, cutting tools, and other precision components that will be hardened after machining. The 18-inch length gives sufficient stock for most single-component toolroom cuts without requiring a saw to rough the bar down from a longer section. Edge squareness is held to 0.003 inches per inch across all edges, which reduces the amount of setup work needed before layout and machining.

Key Features

• AISI Type O1 oil-hardening tool steel — consistent heat-treat response for toolroom use
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance toolmaking
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine condition — no surface prep required before layout

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolroom, die-making, and precision machining applications where oil-quench heat treatment will be performed after final machining.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool-and-die makers using appropriate metalworking equipment. Carbide or high-speed steel tooling is recommended for machining O1 material in the annealed state. Heat treatment — hardening and tempering — must be performed before putting the finished part into service, and should follow established metallurgical procedures for AISI O1 tool steel. Always wear appropriate PPE when cutting or grinding tool steel stock.