Starrett 54234 O1 Tool Steel Flat Stock 1-1/4x3x18 in

Product Description

The STARRETT 54234 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 1-1/4 inches thick, 3 inches wide, and 18 inches long, and weighs 19.13 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical before and after heat treatment. Machinists, toolmakers, and die makers work with this material to produce punches, dies, gauges, and cutting tools that require oil-quench hardening.

O1 tool steel flat stock is a standard material for tool and die shops, maintenance departments, and precision machine shops. It is used in both one-off tooling fabrication and short-run production environments. The 18-inch length provides workable stock for a wide range of tooling blanks without requiring resizing from larger bar stock. This size is commonly ordered by shops producing custom fixtures, blades, and wear components that will undergo oil hardening and tempering after machining.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardenability through quench and temper cycles
• Thickness tolerance of plus or minus 0.001 inches for precise pre-machined fits
• Width tolerance of minus 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine flat stock — no additional sawing or surface grinding required to reach nominal dimensions

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision machining applications requiring an oil-quench hardenable steel.

Installation Notes

This material is machined and then heat treated by a qualified toolmaker or heat treatment professional — oil hardening requires controlled furnace temperatures and a properly maintained quench tank. Secure workpieces adequately during sawing and grinding operations. Follow applicable shop safety standards and equipment manufacturer guidelines for heat treating O1 tool steel. Allow the hardened part to temper promptly after quenching to reduce the risk of cracking.