Starrett 54367 O1 Tool Steel Flat Stock 1/4x1-3/4x36 in

Product Description

The STARRETT 54367 is an O1 oil-hardening tool steel flat stock bar sized at 0.25 inches thick, 1.75 inches wide, and 36 inches long. Manufactured to AISI Type O1 specification, this flat stock is used as raw material for fabricating punches, dies, gauges, cutting tools, and other precision tooling where close dimensional control is required. It arrives in the annealed condition, ready for machining, then oil quenches to high hardness after heat treatment. Thickness tolerance is plus or minus 0.001 inches, making it suitable for applications where tight stock dimensions matter before final grinding. The bar weighs 4.46 pounds.

O1 tool steel flat stock is a staple in machine shops, tool and die operations, and maintenance shops across general manufacturing, metalworking, and industrial facilities. This bar is sized for benchtop layout work or larger tooling blanks. Machinists, toolmakers, and die makers use it to produce custom tooling, wear parts, and fixtures. Its 36-inch length allows multiple pieces to be cut from a single bar, reducing material waste in low-volume tooling jobs.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in the annealed state and achieves high hardness after oil quench
• Thickness tolerance of plus or minus 0.001 inches for precise pre-grind stock allowance
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.015 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single bar quantity — no minimum bundle required

Compatibility

Designed as a standard O1 tool steel flat bar suitable for general toolmaking, die making, and precision machining applications where AISI O1 oil-hardening material is specified.

Installation Notes

Cutting, grinding, and heat treatment of tool steel should be performed by qualified machinists or toolmakers using appropriate personal protective equipment and ventilation. O1 tool steel must be oil quenched — never water quenched — to achieve rated hardness and avoid cracking. Temper immediately after quenching to relieve stress. Follow the tool and die shop's standard procedures for annealing, hardening, and tempering O1 material.