Starrett 56998 O1 Tool Steel Flat Stock 3/8 X 3/8 X 18 in

Product Description

The STARRETT 56998 is an O1 oil-hardening tool steel flat stock bar designed for toolmakers, machinists, and die makers who need a reliable pre-cut blank for fabricating punches, dies, gauges, and cutting tools. The bar measures 3/8 inches thick by 3/8 inches wide by 18 inches long and conforms to AISI Type O1 material specification. Thickness and width tolerances run +0.0100 to 0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch, making this stock suitable for applications where precise geometry is required before heat treatment and grinding.

O1 tool steel flat stock is used in job shops, tool rooms, and maintenance departments for producing or repairing small tooling components. The 18-inch length supports multiple short blanks from a single piece, reducing setup waste. This bar is appropriate for applications where oil-quench hardening is the specified heat-treat process, and where post-hardening grinding to final dimension is planned. Sold individually, this piece suits low-volume prototype or repair work as well as ongoing toolroom inventory.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness and width held to +0.0100 to 0.0150 inches tolerance for consistent stock removal
• Edge squareness of 0.003 inches per inch supports accurate layout and grinding
• Length tolerance of +0.2500 inches provides reliable cut-to-length starting point
• Square cross-section profile — 3/8 inches by 3/8 inches — suits punch, die, and gauge blank applications
• Weighs 0.72 pounds, convenient for single-piece handling and storage

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock blank suitable for toolroom fabrication, die making, and gauge construction where AISI Type O1 material specification is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. All heat-treating operations, including oil quenching, should follow established shop procedures and applicable safety protocols for handling heated metal and quench media. Grind or machine to final dimensions after hardening to achieve required tolerances. Allow the workpiece to reach ambient temperature before taking final dimensional measurements.