Starrett 54027 O1 Tool Steel Flat Stock 5/32x5/32x18 in

Product Description

The STARRETT 54027 is an O1 oil-hardening tool steel flat stock bar sized at 5/32 inches thick, 5/32 inches wide, and 18 inches long. Manufactured to AISI Type O1 tool steel specification, this flat stock is designed for toolmakers, machinists, and die makers who need a precision-ground, ready-to-use blank for punches, dies, gauges, and cutting tools. O1 oil-hardening steel offers excellent machinability in the annealed state and responds predictably to oil-quench heat treatment. The bar ships at a weight of 0.12 pounds, making it easy to handle on the bench. Tight dimensional tolerances and consistent squareness make this a reliable raw-material choice for precision tooling work.

This flat stock is suited for job shop, tool room, and production environments where small-cross-section tool steel blanks are required. Typical applications include small punch blanks, forming tools, scribers, reamers, and fixture components. The 18-inch length allows the machinist to cut multiple shorter blanks from a single piece. This size is commonly used in both industrial shops and trade apprenticeship programs where O1 tool steel is the standard introductory hardening-grade material.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• 5/32 inch square cross-section, 18 inches long
• Square tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.0000 to 0.0050 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges

Compatibility

Designed as a standard raw-material flat stock blank for use in tool room and machining applications requiring AISI Type O1 oil-hardening tool steel in a small square cross-section profile.

Installation Notes

Cutting, grinding, and machining of tool steel should be performed by qualified machinists or toolmakers using appropriate cutting fluids and eye protection. When heat-treating O1 steel, follow established oil-quench procedures and use proper personal protective equipment around hot materials and quench tanks. Ensure all grinding and cutting equipment is rated for tool steel hardness before beginning work. Consult the applicable shop safety codes and material data sheet for handling and disposal guidance.