Starrett 54349 O1 Tool Steel Flat Stock 3/16x5x36 in

Product Description

The STARRETT 54349 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, punches, fixtures, and precision machining applications. Manufactured to AISI Type O1 material specification, it measures 3/16 inch thick, 5 inches wide, and 36 inches long. Thickness tolerance is held to plus or minus 0.001 inches, and length tolerance is plus 0.015 inches. Edge squareness is controlled to 0.003 inches per inch across all edges. The stock ships in an unhardened, annealed condition, ready for machining before final oil-quench hardening. Machinists, tool and die makers, and precision fabricators work with this material regularly.

O1 tool steel flat stock is suited for applications requiring a tough, wear-resistant tool after heat treatment. Common uses include blanking dies, forming tools, gauges, jigs, and cutting tools in both job shop and production environments. This bar size — 3/16 inch thick by 5 inches wide by 36 inches long — provides a workable blank for medium-sized tooling layouts. The 9.56-pound piece weight reflects solid stock with no pre-cut features. Width tolerance runs from 0.000 to minus 0.005 inches.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in annealed state, hardens with oil quench
• Thickness tolerance: plus or minus 0.001 inches for consistent stock removal planning
• Length tolerance: plus 0.015 inches to ensure full usable length
• Width tolerance: 0.000 to minus 0.005 inches
• Edge squareness: 0.003 inches per inch on all edges
• Weighs 9.56 pounds — dense, solid bar with no voids or pre-machined features

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision fixture fabrication applications where oil-quench hardened tool steel is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate HSS or carbide tooling. Heat treatment — including hardening and tempering — should follow AISI O1 procedures and is typically performed by a qualified heat treater or toolroom professional. Always wear appropriate PPE when cutting, grinding, or machining tool steel. Consult applicable shop safety codes and material safety data for tool steel handling.