Starrett 54343 O1 Tool Steel Flat Stock 3/16x1-3/4x36 in

Product Description

The STARRETT 54343 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 3/16 inches thick, 1-3/4 inches wide, and 36 inches long, weighing 3.35 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency directly affects finished part accuracy. The O1 grade offers good machinability in the annealed state and responds well to oil quench hardening, which is why it remains a standard choice for short-run tooling and precision flat components.

This flat stock is used primarily in tool and die shops, machine shops, and maintenance facilities where custom tooling, punches, dies, gauges, or wear plates are fabricated in-house. It is stocked and cut by toolmakers, machinists, and skilled maintenance technicians. The 36-inch length accommodates most bench-scale toolmaking tasks without requiring further resawing for the majority of applications. It is sold as a single piece per package with a minimum order quantity of one.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable hardness response after heat treat
• Thickness held to plus or minus 0.001 inches for precise stock removal planning
• Width tolerance of 0.000 to minus 0.005 inches supports close-tolerance fitting
• Length tolerance of plus 0.015 inches ensures full nominal length on every piece
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch bar length suitable for most bench toolmaking and die component work

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolmaking, die fabrication, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting, grinding, and heat treating of tool steel flat stock is performed by qualified machinists or toolmakers using appropriate metalworking equipment. Always allow the bar to reach a stable temperature before machining to maintain dimensional accuracy. Follow established heat treating procedures for O1 tool steel, including proper preheat, hardening temperature, and oil quench sequence, in accordance with the material specification. Wear appropriate PPE when cutting, grinding, or heat treating.