Starrett 54245 O1 Tool Steel Flat Stock 1.5x4x18 in

Product Description

The STARRETT 54245 is an O1 oil-hardening tool steel flat stock bar intended for tool and die making, jigs, fixtures, punches, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1-1/2 inches thick, 4 inches wide, and 18 inches long and weighs 30.6 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy before and after machining is critical. O1 tool steel offers good machinability in the annealed state and responds well to oil-quench hardening, giving machinists and toolmakers predictable results through the heat-treat cycle.

This flat stock is used in metalworking shops, tool rooms, and maintenance departments for fabricating cutting tools, forming dies, gauges, and wear components. The 1-1/2 inch thickness provides sufficient material for heavy stock removal when grinding or milling profiles. It is typically sourced by machinists, tool and die makers, and maintenance technicians who require a precision-ground, ready-to-machine blank. The 18-inch length accommodates a range of part lengths without excessive material waste.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for precision fitment before machining
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece package at 30.6 pounds — no partial bar splitting required

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock blank suitable for general tool room, die making, and precision machining applications requiring oil-quench hardenable material in a ground flat bar form.

Installation Notes

O1 tool steel flat stock is machined, ground, and heat-treated by qualified machinists or tool and die makers using conventional metalworking equipment. Always allow the bar to reach shop temperature before precision grinding to avoid thermal measurement error. When heat treating, follow the material manufacturer's recommended austenitizing temperature range and quench procedure for AISI O1 steel. Use appropriate personal protective equipment when cutting or grinding this material, and ensure adequate ventilation when performing any grinding or heat-treat operations.