Starrett 54112 O1 Tool Steel Flat Stock 5/16x4-1/2x18 in

Product Description

The STARRETT 54112 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Made from AISI Type O1 oil-hardening tool steel, this flat stock measures 5/16 inches thick, 4-1/2 inches wide, and 18 inches long, and weighs 7.18 pounds. The thickness and squareness tolerances are held to +/- 0.001 inches, making this stock suitable for applications where dimensional accuracy matters before and after heat treatment. Machinists and tool-and-die makers rely on O1 flat stock when they need a material that machines cleanly in the annealed state and responds predictably to oil-quench hardening.

This flat stock is used in general toolroom and industrial manufacturing environments. Typical applications include blanks for punches, dies, gauges, jigs, fixtures, and cutting tools. The 18-inch length provides sufficient material for most single-piece toolroom blanks or can be cut down for multiple smaller components. The 4-1/2-inch width supports wide die or fixture plate applications without requiring a weld or laminate. This stock is supplied in the annealed condition, ready for machining prior to heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in annealed state and hardens predictably with oil quench
• Thickness tolerance of +/- 0.001 inches for consistent dimensional accuracy
• Width tolerance of 0.000 to -0.005 inches for close-tolerance stock removal planning
• Length tolerance of +0.250 inches provides usable overstock for facing or squaring operations
• Squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with a minimum order quantity of 1

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolroom machining, die making, and fixture fabrication where AISI Type O1 material specification is required.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool-and-die makers using conventional milling, grinding, and sawing equipment. Material should be machined to near-final dimensions in the annealed state before heat treatment. Oil-quench hardening and tempering should be performed by a qualified heat treater following AISI O1 recommended thermal cycles. Always use appropriate personal protective equipment when cutting or grinding tool steel.