Starrett 54311 O1 Tool Steel Flat Stock 1/8x5x36 in

Product Description

The STARRETT 54311 is an O1 oil-hardening tool steel flat stock bar sized at 1/8 inch thick, 5 inches wide, and 36 inches long. O1 tool steel is an oil-quench grade known for its good dimensional stability during hardening and its ability to hold a sharp edge after heat treatment. This flat stock ships in the annealed (soft) condition, ready for machining, grinding, or sawing to final shape before hardening. Machinists, toolmakers, and die makers use this material to fabricate punches, dies, blades, gauges, and similar precision tooling where tight tolerances and consistent steel quality are required.

This flat bar is suited to tool and die shops, maintenance toolrooms, and jobbing machine shops running both prototype and production work. The 36-inch length provides enough material for multiple blanks from a single piece, reducing setup time when laying out several components. The 5-inch width accommodates wider die plates and form blocks without requiring lamination or welding. Edge squareness is held to 0.003 inch per inch, which simplifies layout and reduces the need for additional truing before machining.

Key Features

• AISI Type O1 oil-hardening tool steel — stable geometry during oil-quench heat treatment
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal in grinding operations
• Width tolerance of 0.000 to minus 0.005 inches — bar runs at or slightly under nominal for predictable fit
• Length tolerance of plus 0.015 inches — full nominal length guaranteed with minor overage
• Edge squareness held to 0.003 inch per inch on all edges
• Annealed condition allows machining with standard HSS or carbide tooling prior to hardening

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for fabrication of punches, dies, blades, gauges, and general toolroom components requiring a hardenable steel in flat stock form.

Installation Notes

This material is typically processed by machinists or toolmakers using conventional milling, sawing, surface grinding, and drilling equipment. Heat treatment to final hardness should be performed by qualified personnel following AISI O1 oil-quench procedures, which involve austenitizing and quenching in oil followed by a tempering cycle. Handle ground or finish-machined surfaces with care to avoid nicking edges prior to hardening. No trade license is required for material purchase, but heat treatment operations should follow applicable shop safety protocols for high-temperature furnace work.