Starrett 57230 O1 Tool Steel Flat Stock 3/16x1/4x18 in

Product Description

The STARRETT 57230 is an O1 oil-hardening tool steel flat stock bar designed for toolmakers, machinists, and die makers who require tight-tolerance raw stock for fabricating punches, dies, jigs, and cutting tools. Ground and held to close dimensional tolerances, this flat stock measures 3/16 inches thick, 1/4 inches wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. The AISI Type O1 alloy is well-suited for applications requiring good wear resistance and ease of hardening in an oil quench. It ships in single-piece quantity, making it practical for low-volume toolroom use.

This flat stock is used in precision toolmaking environments including tool and die shops, maintenance departments, and machine shops. Typical applications include blanks for small punches, form tools, scribers, and custom cutting edges. The 18-inch length provides enough material for multiple tool blanks from a single piece. Its ground surfaces reduce setup time and allow direct use as a reference edge or tool blank without extensive pre-machining.

Key Features

• AISI Type O1 oil-hardening tool steel — responds well to conventional heat treatment in oil quench
• Thickness held to plus or minus 0.001 inches for precise fit in toolroom applications
• Width tolerance of 0.000 to minus 0.005 inches ensures stock is at or under nominal
• Length tolerance of plus 0.250 inches provides usable extra material for facing to final length
• Edge squareness held to 0.003 inches per inch across all edges
• Single-piece packaging suits low-volume and prototype toolroom needs

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolroom fabrication wherever O1 ground flat stock in 3/16 x 1/4 inch cross-section is specified.

Installation Notes

Cutting and grinding of tool steel flat stock should be performed by a qualified machinist using appropriate metalworking equipment. When heat treating, follow established oil-quench procedures for AISI O1 tool steel and use proper personal protective equipment. Grinding operations generate fine metallic dust — use adequate ventilation and respiratory protection. Final hardening and tempering should be performed before finish grinding to final dimensions.