Starrett 54408 O1 Oil-hardening Flat Stock 3/8x3/4x36 in

Product Description

The STARRETT 54408 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable, ready-to-machine blank. Manufactured to AISI Type O1 specification, this flat stock measures 3/8 inches thick, 3/4 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches and a length tolerance of plus 0.015 inches. O1 tool steel offers good machinability in the annealed state and responds well to oil quenching, making it a common choice for punches, dies, gauges, and cutting tools. Weight is 2.87 pounds per piece.

This flat stock is suited for machine shop, toolroom, and maintenance environments where precise blanks are needed for fabricating tooling components. The 36-inch length provides a standard working bar that can be cut to finished dimensions on a bandsaw or cold saw before machining. It is appropriate for both one-off tooling projects and small-batch production setups. Typical users include tool and die makers, mold makers, and general machinists working in job shops or maintenance departments.

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 blanks
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.015 inches
• Squareness: edge all 0.003 inches per inch
• Ready-to-machine annealed condition — cut, mill, grind, then harden and temper as needed

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for fabricating punches, dies, gauges, cutting tools, and general toolroom components requiring oil-quench heat treatment.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment including band saws, milling machines, and surface grinders. Use proper cutting fluids to maintain workpiece temperature and tool life during machining. Heat treatment — including hardening and tempering — should be performed by qualified personnel following established metallurgical procedures for AISI O1 tool steel. Always wear appropriate PPE including safety glasses and heat-resistant gloves during cutting and heat-treat operations.