Starrett 56976 O1 Tool Steel Flat Stock 1/4x1.5x18 in

Product Description

The STARRETT 56976 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, punch fabrication, and general machine shop work. It measures 0.25 inches thick, 1.5 inches wide, and 18 inches long, with a shipping weight of 1.91 pounds. The stock is manufactured to AISI Type O1 oil-hardening specification, a widely used tool steel grade known for its dimensional stability and ease of hardening in oil quench. Thickness and width tolerances run +0.0100 to +0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch on all edges, supporting accurate layout and machining before heat treatment.

This flat stock is suited for fabricating cutting tools, gauges, jigs, fixtures, blanks, and die components in job shop, toolroom, and production environments. Machinists and tool-and-die makers work with O1 flat stock in the annealed condition, then heat-treat to required hardness after machining. The 18-inch length and 1.5-inch width make this piece practical for a wide range of small to medium toolroom applications without requiring further slitting or rough sizing from larger bar.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat-treat response
• Thickness: 0.25 inches with +0.0100 to +0.0150 inch tolerance
• Width: 1.5 inches with +0.0100 to +0.0150 inch tolerance
• Length: 18 inches with +0.2500 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock for general toolroom and die-making applications requiring AISI Type O1 material in 0.25 inch by 1.5 inch cross-section.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and tool-and-die makers using conventional milling, grinding, and sawing equipment. Material should be machined in the annealed state before any heat-treating operations. Follow accepted shop practice and applicable safety standards when cutting, grinding, or handling tool steel. Heat treatment, including hardening and tempering, should be performed by personnel familiar with O1 oil-quench procedures to achieve desired hardness without cracking.