Starrett 54308 O1 Tool Steel Flat Stock 1/8 X 3-1/2 X 36 in

Product Description

The STARRETT 54308 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock holds tight dimensional tolerances straight from stock, making it suitable for blanks, jigs, fixtures, and custom tooling components. The bar measures 0.125 inches thick, 3.5 inches wide, and 36 inches long and weighs 4.47 pounds. Thickness tolerance is plus or minus 0.001 inches, providing consistent stock removal and predictable heat-treat response across the full length.

This flat stock is intended for machinists, tool and die makers, and fabricators working in job shop, production, and maintenance-repair environments. O1 tool steel is a general-purpose oil-hardening grade well suited for punches, dies, gauges, and cutting tools where moderate wear resistance and good machinability in the annealed state are required. The 36-inch length allows multiple blanks to be cut from a single piece, reducing waste in short-run tooling work. It ships in the annealed condition and is ready for machining prior to heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel — annealed condition, ready to machine
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal
• Length tolerance of plus 0.015 inches, minus 0 inches
• Width tolerance of 0.000 to minus 0.005 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece packaging suitable for low-volume toolroom procurement

Compatibility

Designed as a standard annealed O1 tool steel flat bar for general toolroom and die shop applications requiring oil-hardening grade material in a 0.125-inch by 3.5-inch cross section.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metal-cutting equipment such as a band saw, mill, or surface grinder; wear appropriate PPE including eye protection and cut-resistant gloves. Heat treatment to final hardness should be performed by a qualified heat treater or toolroom professional following recognized procedures for AISI O1 tool steel. Always allow the workpiece to reach ambient temperature before taking final dimensional measurements. Hardened tool steel components should be handled with care to avoid edge chipping prior to any draw or tempering operation.