Starrett 54366 O1 Tool Steel Flat Stock 1/4x1-1/2x36 in

Product Description

The STARRETT 54366 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Cut from AISI Type O1 material, this flat stock measures 0.25 inches thick, 1.5 inches wide, and 36 inches long, with a weight of 3.83 pounds. O1 tool steel is valued for its machinability in the annealed state and its ability to achieve high hardness after oil quenching. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications that require close dimensional control before and after heat treatment. Machinists, tool and die makers, and metalworking shops stock this material for fabricating punches, dies, gauges, and cutting tools.

This flat stock is suited for low-to-medium production tooling in machine shops, fabrication facilities, and maintenance departments. The 36-inch length provides a practical working blank that can be cut to finished part length on a bandsaw or cold saw. The annealed condition allows conventional milling, turning, drilling, and grinding before hardening. After oil quenching and tempering, O1 achieves high surface hardness suitable for wear-resistant tooling applications. Width tolerance is held from 0.000 to negative 0.005 inches, and length tolerance carries a positive 0.015-inch allowance.

Key Features

• AISI Type O1 oil-hardening tool steel in annealed flat bar form
• Thickness: 0.25 inches with plus or minus 0.001-inch tolerance
• Width: 1.5 inches with 0.000 to negative 0.005-inch tolerance
• Length: 36 inches with positive 0.015-inch tolerance
• Edge squareness: all edges held to 0.003 inches per inch
• Suitable for machining in the soft state prior to oil-quench hardening

Compatibility

Designed as a standard O1 tool steel flat stock blank for general toolmaking, die making, and precision machining applications requiring oil-hardening grade material.

Installation Notes

Cutting, grinding, and machining should be performed while the material is in the annealed condition prior to heat treatment. Use appropriate metalworking equipment and personal protective equipment when cutting or grinding tool steel. Heat treatment, including hardening and tempering, should be performed by a qualified heat treater following established metallurgical procedures for AISI O1 tool steel. Deburr all edges after cutting to prevent handling injuries and to achieve accurate layout dimensions.