Starrett 56959 O1 Tool Steel Flat Stock 3/16x3/4x18 in

Product Description

The STARRETT 56959 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Conforming to AISI Type O1 specifications, this flat stock measures 3/16 inches thick, 3/4 inches wide, and 18 inches long, with a weight of 0.72 pounds. Thickness and width tolerances are held to +0.0100 to 0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is maintained at 0.003 inches per inch across all edges, making it suitable for applications requiring tight dimensional accuracy.

This flat stock is intended for machinists, tool and die makers, and metal fabricators working in job shops, production facilities, or maintenance departments. O1 tool steel is widely used for cutting tools, punches, dies, gauges, and fixtures where oil-hardening heat treatment is required after machining. The 18-inch length is a standard stock size that accommodates a range of toolroom projects without excessive material waste.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat treat response
• Thickness: 3/16 inches with tolerance of +0.0100 to 0.0150 inches
• Width: 3/4 inches with tolerance of +0.0100 to 0.0150 inches
• Length: 18 inches with tolerance of +0.2500 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready for machining prior to oil-hardening heat treatment

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for toolroom, die making, and general precision machining applications where AISI Type O1 material is specified.

Installation Notes

Machining and grinding should be completed before oil-hardening heat treatment. Machinists should follow standard tool steel handling practices and use appropriate cutting fluids when machining O1 stock. Heat treatment including hardening and tempering should be performed by qualified personnel using controlled furnace equipment. Always wear appropriate PPE when cutting, grinding, or heat treating tool steel.