Starrett 54116 O1 Tool Steel Flat Stock 3/8x3/8x18 in

Product Description

The STARRETT 54116 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 3/8 inches thick by 3/8 inches wide by 18 inches long and weighs 0.72 pounds. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is maintained to within 0.003 inches per inch on all edges. Licensed machinists, tool and die makers, and precision fabricators stock this material for custom tooling, punches, gauges, and similar hardened-steel components that require tight dimensional control before heat treatment.

O1 tool steel flat stock is suited for low-production tooling and short-run applications where oil-quench hardening is preferred. It performs well in shop environments where the bar will be machined, ground, or shaped to final dimensions in the annealed state, then hardened and tempered to service hardness. The 18-inch length provides a practical workable blank for a wide range of toolroom tasks. This size is commonly used for small punches, cutting tools, jigs, fixtures, and wear parts in both job-shop and production-shop settings.

Key Features

• AISI Type O1 oil-hardening tool steel — machines in annealed state and hardens with oil quench
• Thickness held to plus or minus 0.001 inches for consistent stock removal during grinding
• Width tolerance of 0.000 to minus 0.005 inches supports close-fit applications
• Length tolerance of plus 0.250 inches allows for facing and cutoff without undersize risk
• Squareness maintained to 0.003 inches per inch on all edges
• 18-inch bar length suits typical toolroom blanks for punches, gauges, and cutting tools

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock blank for use in toolrooms, machine shops, and die shops requiring AISI Type O1 material in a 3/8 inches by 3/8 inches cross-section.

Installation Notes

Machining and grinding should be performed in the annealed condition before heat treatment. Heat treatment of O1 tool steel requires proper hardening, quenching, and tempering procedures and should be carried out by qualified personnel following established metallurgical practice. Always use appropriate personal protective equipment when cutting, grinding, or heat-treating tool steel stock. Follow applicable shop safety codes and standards when handling and processing steel bar stock.