Starrett 54446 O1 Tool Steel Flat Stock 0.5x3.5x36 in

Product Description

The STARRETT 54446 is an O1 oil-hardening tool steel flat stock bar sized at 0.5 inches thick, 3.5 inches wide, and 36 inches long. Made from AISI Type O1 tool steel, this flat stock is a standard choice for toolmakers, machinists, and die shops that need a reliable, hardenable steel in a ready-to-machine form. O1 tool steel offers good wear resistance and dimensional stability through the hardening process, making it suitable for dies, punches, gauges, jigs, and cutting tools. At 17.85 pounds per bar, the piece is sized for bench or machine work without further breakdown.

This flat stock is used in tool and die applications, machine shops, and maintenance departments where a machinable, oil-hardening steel blank is required. It is appropriate for both prototype and production tooling. The 36-inch length suits layout and stock cutting on a surface plate or bandsaw. Typical end users include tool and die makers, mold makers, and industrial maintenance machinists working in light to heavy manufacturing environments.

Key Features

• AISI Type O1 oil-hardening tool steel for good wear resistance and machinability before hardening
• Tight thickness tolerance of plus or minus 0.001 inches for precision stock preparation
• Width tolerance of 0.000 to minus 0.005 inches for consistent fit in close-tolerance setups
• Length tolerance of plus 0.015 inches with no negative allowance
• Edge squareness held to 0.003 inches per inch across all edges
• Full 36-inch bar length supports multiple blanks from a single piece

Compatibility

Designed as a general-purpose O1 tool steel flat stock blank for use in tool and die, punch and die, gauge, and fixture applications where an oil-hardening steel in flat bar form is specified.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Use proper coolant and cutting speeds per the tool steel grade to avoid work hardening or surface damage before heat treatment. Heat treating to final hardness should follow AISI O1 recommended practices and be performed in a controlled-atmosphere furnace when surface finish is critical. Always use appropriate PPE when cutting or grinding steel bar stock.