Starrett 54235 O1 Tool Steel Flat Stock 1-1/4x4x18 in

Product Description

The STARRETT 54235 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 1-1/4 inches thick, 4 inches wide, and 18 inches long, and weighs 25.5 pounds. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is controlled to 0.003 inches per inch on all edges. This level of dimensional precision makes it well-suited for fabricating jigs, fixtures, punches, and cutting tools where close tolerances are required before heat treatment.

O1 tool steel flat stock is used in machine shops, tool-and-die operations, and industrial fabrication environments. It is typically purchased by machinists, toolmakers, and metalworking professionals who need reliable pre-hardened or annealable stock for custom tooling. The 18-inch length provides a practical working blank for a range of tool profiles. This piece ships as a single unit with a package quantity of one.

Key Features

• AISI Type O1 oil-hardening tool steel construction for consistent hardening response
• Thickness held to plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches from nominal 18 inches
• Edge squareness controlled to 0.003 inches per inch on all edges
• 25.5 pound piece weight suitable for substantial tooling blanks

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar for use in general toolmaking, die work, and precision machining applications requiring oil-quench heat treatment.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists using appropriate metalworking equipment. Follow all shop safety protocols including eye and hand protection when cutting or grinding. Heat treatment of O1 tool steel requires oil quenching and should be performed by personnel familiar with proper hardening and tempering procedures to avoid cracking or distortion. Consult material data and applicable shop standards before processing.