Starrett 54158 O1 Tool Steel Flat Stock 0.5x4.5x18 in

Product Description

The STARRETT 54158 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die-making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 0.5 inches thick, 4.5 inches wide, and 18 inches long, with a weight of 11.48 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency is critical before and after heat treatment. It is typically purchased by toolmakers, machinists, and die makers who need reliable, machinable stock that responds predictably to oil-quench hardening.

O1 tool steel flat stock is a standard material for fabricating punches, dies, gauges, jigs, fixtures, and cutting tools in both job shops and production machine shops. This piece is suited to low-to-medium production tooling where good wear resistance and ease of machining in the annealed state are required. The 18-inch length provides enough material for a range of tooling blanks or can be cut down to specific component lengths. Industrial supply houses, tooling distributors, and machine shops stock this grade for on-demand toolmaking work.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for dimensional precision
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches
• Edge squareness held to 0.003 inches per inch across all edges
• Annealed condition allows machining before hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for general toolmaking, die-making, and precision fixture fabrication where AISI Type O1 material specification is required.

Installation Notes

Cutting and grinding of tool steel flat stock should be performed by a qualified machinist using appropriate coolant to prevent localized overheating of the material. Heat treatment, including oil quenching and tempering, should follow established procedures for AISI O1 tool steel and should be performed by qualified personnel familiar with tool steel metallurgy. Secure workholding and proper personal protective equipment are required during all cutting, grinding, and handling operations. Edges are sharp as-supplied and should be handled accordingly.