Starrett 54504 O1 Tool Steel Flat Stock 1x2.5x36 in

Product Description

The STARRETT 54504 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1 inch thick, 2.5 inches wide, and 36 inches long, with a weight of 25.5 pounds. O1 tool steel is a general-purpose oil-hardening grade known for its dimensional stability during heat treatment, good machinability in the annealed state, and ability to hold a fine edge after hardening. This stock is supplied in a ready-to-machine form and is used by tool and die makers, machinists, and metalworking professionals who require consistent dimensional tolerances before and after hardening.

O1 flat stock in this size is well suited for fabricating punches, dies, jigs, fixtures, gauges, and cutting tools in both job-shop and production environments. The 36-inch length provides adequate stock for multiple parts to be cut from a single bar, reducing setup time. Typical users include tool and die shops, maintenance departments, and precision machine shops working with ferrous tooling. The oil-hardening characteristic makes it suitable for applications where water-hardening steels present distortion risk.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response and minimal distortion
• Thickness tolerance of plus or minus 0.001 inches for tight dimensional control before machining
• Width tolerance of 0.0000 to 0.0050 inches for consistent stock width
• Length tolerance of plus 0.015 inches, minus 0 inches ensuring full usable length
• Squareness: edge all 0.003 per inch for reliable reference surfaces
• 25.5-pound bar weight suitable for bench or vise work in standard shop environments

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar compatible with conventional machining, grinding, and oil-quench heat treatment processes used in tool and die fabrication.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate tooling rated for tool steel hardness. Secure the bar firmly in a vise or fixture before sawing or milling to prevent movement. Heat treatment, including hardening and tempering, should follow established metallurgical procedures for AISI O1 steel and be performed in a controlled environment. Always wear appropriate PPE including eye protection and gloves when cutting or grinding tool steel.