Starrett 59159 O1 Tool Steel Oil-hardening Flat Stock

Product Description

The STARRETT 59159 is an O1 oil-hardening tool steel flat stock bar intended for toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.5 inches thick, 12 inches wide, and 36 inches long, weighing approximately 61.2 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications that demand dimensional consistency before and after heat treatment. Machinists and tool and die makers rely on O1 for its predictable oil-quench hardening response and good wear resistance in finished tooling.

O1 oil-hardening flat stock is used across job shops, toolrooms, and manufacturing facilities for fabricating punches, dies, gauges, jigs, fixtures, and cutting tools. The 12-inch width and 36-inch length make this a large-format blank appropriate for wide die plates or multiple smaller tool blanks cut from a single piece. It is typically worked by machining in the annealed condition before hardening and tempering to the required service hardness. Metalworking shops and industrial suppliers stock this grade where dimensional stability and machinability prior to heat treat are priorities.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness tolerance of plus or minus 0.001 inches for tight dimensional control
• Length tolerance of plus 0.015 inches for consistent stock length
• Width tolerance of 0.000 to 0.015 inches on the minus side
• Edge squareness held to 0.003 inches per inch across all edges
• Large-format blank at 0.5 x 12 x 36 inches for wide tooling and die plate applications

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolmaking and die making applications requiring oil-quench hardening.

Installation Notes

Cutting, grinding, and machining should be performed in the annealed condition prior to heat treatment. Licensed heat treaters or qualified tool and die personnel should perform oil-quench hardening and tempering operations in accordance with standard metallurgical procedures for AISI O1. Use appropriate personal protective equipment and material handling equipment when moving stock of this weight. Follow applicable shop safety codes and OSHA material handling guidelines for heavy stock.