Starrett 57030 O1 Tool Steel Flat Stock 5/8 X 5/8 X 18 in

Product Description

The STARRETT 57030 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable, machinable blank for punches, dies, gauges, and cutting tools. Manufactured to AISI Type O1 specification, this bar measures 0.625 inches thick by 0.625 inches wide by 18 inches long and weighs approximately 1.99 pounds. Thickness and width tolerances are held to +0.0100 to +0.0150 inches, and length tolerance is +0.250 inches. Edge squareness is held to 0.003 inches per inch, making this stock suitable for precision layout and grinding work without extensive pre-machining.

O1 tool steel flat stock is used across job shops, tool-and-die operations, and maintenance departments wherever a tough, oil-quench-hardenable blank is needed. This size is commonly used for small punches, form tools, and fixture components where section mass and geometry need to be held through heat treat. It machines well in the annealed condition and responds predictably to oil quench hardening, making it a standard choice for one-off tooling and short-run production tooling applications.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardenability in oil quench
• 0.625 inches thick by 0.625 inches wide by 18 inches long nominal dimensions
• Thickness and width tolerances: +0.0100 to +0.0150 inches for predictable fit in tooling setups
• Length tolerance: +0.250 inches, allowing for facing or parting to final length
• Edge squareness held to 0.003 inches per inch on all edges
• Ships in annealed condition for ease of machining prior to hardening

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for use in general toolmaking, die making, and precision machining applications where O1 material specification is required.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and toolmakers using conventional milling, grinding, and turning equipment. Material should be machined in the annealed condition before heat treatment. Follow established shop practice and applicable safety standards when hardening and quenching; improper quench technique can cause cracking or distortion. Handle hardened sections with care, as hardened tool steel is brittle and susceptible to impact fracture.