Starrett 54151 O1 Tool Steel Flat Stock 0.5x1.25x18 in

Product Description

The STARRETT 54151 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.5 inches thick, 1.25 inches wide, and 18 inches long, and weighs 3.19 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy is critical before and after heat treatment. O1 tool steel responds well to oil quenching and offers good wear resistance, making it a standard choice for punches, dies, gauges, and cutting tools.

This flat stock is used by machinists, tool and die makers, and metalworking shops requiring pre-dimensioned stock that can be rough-machined, heat treated, and finish-ground to final dimensions. The 18-inch length provides practical stock for a range of small to medium tooling components. Its consistent cross-section reduces setup time when close-tolerance blanks are needed directly from stock.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness: 0.5 inches with tolerance of plus or minus 0.001 inches
• Width: 1.25 inches with tolerance of 0.0000 to 0.005 inches
• Length: 18 inches with length tolerance of plus 0.25 inches
• Squareness: edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine flat stock format reduces raw material prep time

Compatibility

Designed as a standard AISI O1 oil-hardening flat stock bar suitable for general toolmaking, die making, and precision machining applications requiring pre-dimensioned tool steel stock.

Installation Notes

Machining and heat treatment of tool steel flat stock is performed by qualified machinists and tool and die makers. Oil quenching should be performed in accordance with established shop practice for O1 tool steel and applicable workplace safety requirements. All cutting, grinding, and heat treat operations should follow standard shop safety protocols, including appropriate PPE for hot work and grinding. Allow parts to reach ambient temperature before final dimensional inspection.