Starrett 54104 O1 Tool Steel Flat Stock 5/16x1x18 in

Product Description

The STARRETT 54104 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, punch fabrication, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 5/16 inches thick, 1 inch wide, and 18 inches long, with a weight of 1.59 pounds. The O1 grade offers good machinability in the annealed state and responds well to oil-quench hardening, making it a reliable choice for cutting tools, gauges, jigs, and fixtures. Tight dimensional tolerances are held throughout, supporting accurate stock removal and finished-part repeatability in both shop and production environments.

This flat stock is suited for machine shops, tool and die operations, and maintenance departments requiring a readily machinable tool steel that can be hardened and tempered to working hardness after rough shaping. Typical uses include blanks for custom punches, form tools, stripper plates, wear pads, and hand tools. The 18-inch length provides sufficient material for multiple smaller blanks or a single longer workpiece, and the 1-inch width suits a wide range of standard tooling layouts.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance stock
• 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
• Ready-to-machine annealed condition straight from stock

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolmaking, die work, and precision fixture fabrication across machine shop and industrial maintenance applications.

Installation Notes

Cutting, grinding, and machining should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Follow standard shop safety practices including eye protection, secure workholding, and proper coolant use when cutting or grinding. Heat treatment requires controlled furnace equipment and appropriate quenching media; follow the material supplier heat-treat guidelines for AISI O1 tool steel. Handle cut edges with care, as sharp burrs are common after sawing or shearing.