Starrett 54355 O1 Tool Steel Flat Stock 7/32x1x36 in

Product Description

The STARRETT 54355 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 7/32 inches thick, 1 inch wide, and 36 inches long, weighing 2.23 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 hardening. Licensed machinists, toolmakers, and die makers work with this material to fabricate punches, dies, gauges, and cutting tools that will be heat treated after machining to final form.

O1 tool steel flat stock in this size range is a common starting material in job shops, tool rooms, and maintenance departments. The 36-inch length provides enough stock to yield multiple smaller blanks from a single piece. The 1-inch width and 7/32-inch thickness are standard proportions suited to small punch blanks, flat gauge stock, and thin die components. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and setup work directly off the bar.

Key Features

• AISI Type O1 oil-hardening tool steel — machines readily in the annealed state and hardens in oil quench
• Thickness: 7/32 inches with plus or minus 0.001-inch tolerance
• Width: 1 inch with tolerance of 0.000 to minus 0.005 inches
• Length: 36 inches with plus 0.015-inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Weight: 2.23 pounds per piece

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for toolroom, die shop, and precision machining applications requiring annealed stock that will be machined and then oil-quench hardened.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment by qualified machinists or toolmakers. Follow established shop safety practices including eye and hand protection when sawing, milling, or grinding. Heat treatment to harden O1 steel requires controlled furnace temperatures and an oil quench — this work should be performed by personnel familiar with tool steel heat treatment procedures and applicable shop safety codes. Allow stock to return to ambient temperature before precision measurement to ensure accurate readings.