Starrett 54108 O1 Tool Steel Flat Stock 5/16x2-1/2x18 in

Product Description

The STARRETT 54108 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die-making, and precision machining applications. It is manufactured from AISI Type O1 tool steel, which responds well to oil-quench hardening and is widely used for punches, dies, gauges, and cutting tools. The bar measures 5/16 inches thick, 2-1/2 inches wide, and 18 inches long, with a weight of approximately 3.99 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency before and after hardening is critical. Machinists and tool-and-die makers typically work this material in the annealed condition before heat treatment.

This flat stock is suited for job shops, toolrooms, and maintenance departments that fabricate custom tooling, jigs, fixtures, or wear components. Its flat-bar form makes it efficient to saw, mill, grind, or drill to net shape prior to hardening. The 18-inch length provides adequate stock for a range of small to mid-size tooling blanks, and the 2-1/2-inch width accommodates wider die sections and plates without requiring a weld or lamination.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness: 5/16 inches with tolerance of plus or minus 0.001 inches
• Width: 2-1/2 inches with tolerance of 0.000 to minus 0.005 inches
• Length: 18 inches with tolerance of plus 0.250 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a general-purpose O1 tool steel flat stock bar for use in toolroom, die-making, and precision machining environments where AISI Type O1 oil-hardening material is specified.

Installation Notes

This material is worked by machinists and tool-and-die makers using conventional milling, sawing, grinding, and drilling equipment. All machining should be completed in the annealed condition before any heat-treatment process. Oil-hardening heat treatment should be performed by a qualified heat treater following established procedures for AISI O1 tool steel. Handle ground or finish-machined surfaces carefully to avoid nicking or scratching critical tolerance areas prior to hardening.