Starrett 57018 O1 Tool Steel Flat Stock 0.5x1.5x18 in

Product Description

The STARRETT 57018 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.5 inches thick, 1.5 inches wide, and 18 inches long, with a shipping weight of 3.83 pounds. Thickness and width tolerances run from +0.010 to +0.015 inches, and length tolerance is +0.250 inches. Edge squareness is held to 0.003 inches per inch across all edges. O1 tool steel offers good machinability in the annealed state and responds well to oil-quench heat treatment, making it a widely used choice for punches, dies, gauges, and cutting tools.

This flat stock is suited for machine shops, tool-and-die operations, and maintenance departments that fabricate or repair tooling in-house. The 18-inch length provides enough stock to rough-cut multiple blanks for small tooling components. The pre-sized width and thickness reduce initial stock removal, saving setup time on the mill or surface grinder. Machinists and toolmakers in both job-shop and production environments commonly use O1 flat stock as a starting point for custom tooling, fixtures, and wear parts.

Key Features

• AISI Type O1 oil-hardening tool steel — good machinability before hardening, reliable response to oil quench
• Dimensions: 0.5 inches thick x 1.5 inches wide x 18 inches long
• Thickness tolerance: +0.010 to +0.015 inches for consistent stock removal
• Width tolerance: +0.010 to +0.015 inches
• Length tolerance: +0.250 inches
• Edge squareness held to 0.003 inches per inch on all edges

Compatibility

Designed as a general-purpose O1 tool steel flat stock bar suitable for toolmaking, die making, fixture fabrication, and similar precision machining applications where oil-hardening tool steel is specified.

Installation Notes

Cutting, grinding, and heat treatment of tool steel should be performed by qualified machinists or toolmakers familiar with O1 material handling. Always use appropriate personal protective equipment when cutting or grinding. If heat treating, follow proper oil-quench procedures and consult applicable shop safety protocols for quench fire prevention. Machining operations should be completed before hardening, as O1 tool steel becomes significantly harder and more brittle after heat treatment.