Starrett 54051 O1 Tool Steel Flat Stock 3/16x3x18 in

Product Description

The STARRETT 54051 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 3/16 inch thick, 3 inches wide, and 18 inches long, with a weight of 2.87 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. Licensed machinists, tool and die makers, and precision fabricators are the primary users of this material.

O1 tool steel flat stock is a staple in shops producing punches, dies, gauges, knives, and cutting tools. The oil-hardening grade offers good machinability in the annealed state and responds predictably to heat treatment, allowing the stock to be machined to near-final dimensions and then hardened. This bar is sized for benchtop and vertical mill work where a 3-inch-wide profile is needed without requiring additional width reduction. It ships in single-piece quantity, making it practical for low-volume toolroom orders.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness of 3/16 inch with plus or minus 0.001 inch tolerance
• Width of 3 inches with tolerance of minus 0 to minus 0.005 inches
• Length of 18 inches with plus 0.250 inch tolerance
• Squareness held to 0.003 inches per inch on all edges
• Good machinability in annealed condition prior to hardening

Compatibility

Designed as a standard O1 tool steel flat stock for general toolroom, die shop, and precision machining use where AISI Type O1 oil-hardening material in a 3/16 x 3 x 18 inch profile is specified.

Installation Notes

Machining and heat treatment of O1 tool steel should be performed by qualified machinists or tool and die makers familiar with AISI tool steel procedures. Wear appropriate PPE when cutting, grinding, or handling flat stock with sharp edges. Follow the material supplier and shop safety protocols for oil-quench hardening operations, including proper ventilation and quench tank management. Do not attempt to weld O1 tool steel without consulting a qualified metallurgist, as the alloy is not intended for welding in most toolroom applications.