Starrett 54157 O1 Tool Steel Flat Stock 1/2x4x18 in

Product Description

The STARRETT 54157 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. It measures 0.5 inches thick, 4 inches wide, and 18 inches long, and weighs approximately 10.2 pounds. Manufactured to AISI Type O1 material specification, this flat stock offers tight dimensional tolerances, making it suitable for applications where accuracy and consistent stock size are critical before hardening. Licensed machinists, toolmakers, and metalworking professionals select O1 flat stock for its predictable heat-treat response and good wear resistance after oil quenching.

This flat stock is suited for fabrication of punches, dies, gauges, cutting tools, and similar precision components in both job-shop and production toolroom environments. The 4-inch width and 18-inch length provide sufficient material for a range of toolroom blanks without excessive scrap. It ships as a single piece at the stated dimensions and is ready for layout, machining, and subsequent oil-hardening heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening response
• Thickness tolerance of plus or minus 0.001 inches for precise as-received dimensions
• Width tolerance of 0.000 to 0.005 inches (negative direction)
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness held to 0.003 inches per inch on all edges
• Single-piece quantity; no partial pieces or remnants

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for toolroom, die, and precision fixture applications requiring AISI Type O1 material.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified toolmakers or machinists using appropriate metalworking equipment. Follow all applicable shop safety procedures, including eye and hand protection, when cutting or grinding. Heat treatment must be performed in a controlled environment following AISI O1 oil-quench specifications; improper quenching can result in cracking or distortion. Handle with care to avoid nicking or bending finished surfaces prior to machining.