Starrett 53958 O1 Tool Steel Flat Stock 1/16x1.5x18 in

Product Description

The STARRETT 53958 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.0625 inches thick, 1.5 inches wide, and 18 inches long, with a finished weight of 0.48 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical. Machinists and tool-and-die makers use this stock as raw material for punches, dies, gauges, and cutting tools that will be oil-quench hardened after machining.

O1 tool steel flat stock is a standard material in job shops, toolrooms, and maintenance facilities. This bar is supplied in the annealed condition, which allows conventional machining before heat treatment. It is sized for small-to-medium tooling components and fits common bench vise and surface grinder workholding setups. The 18-inch length provides enough stock for multiple small blanks or a single elongated tool body. Edge squareness is held to 0.003 inches per inch on all edges, supporting accurate layout and setup directly from stock.

Key Features

• AISI Type O1 oil-hardening tool steel — annealed condition, ready for machining and subsequent oil quench
• Thickness: 0.0625 inches with plus or minus 0.001 inches tolerance
• Width: 1.5 inches with a tolerance of 0.0000 to minus 0.005 inches
• Length: 18 inches with a plus 0.250 inches length tolerance
• Edge squareness: 0.003 inches per inch on all edges
• Weight: 0.48 pounds per piece

Compatibility

Designed as a general-purpose O1 tool steel flat bar for toolroom and die shop use where AISI Type O1 oil-hardening material is specified. No specific equipment compatibility applies to raw flat stock.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and tool-and-die makers using conventional metal-cutting equipment. Material should be machined in the annealed condition prior to heat treatment. Follow established metallurgical practices and applicable shop safety standards when hardening and quenching. Always use appropriate personal protective equipment when cutting, grinding, or heat-treating tool steel.