Starrett 53961 O1 Tool Steel Flat Stock 1/16 X 2-1/2 X 18 in

Product Description

The STARRETT 53961 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig building, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.0625 inches thick, 2.5 inches wide, and 18 inches long. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical before hardening. Machinists and tool and die makers rely on O1 stock for its predictable oil-quench response and good wear resistance after heat treatment.

O1 tool steel flat stock is a standard material for fabricating punches, dies, gauges, cutting tools, fixtures, and wear parts. This piece is sized for bench-scale toolroom work and short-run tooling. It machines readily in the annealed condition and responds well to standard oil-quench hardening procedures. Typical users include toolmakers, machinists, and maintenance shops requiring a reliable, close-tolerance starting material for ground or machined tooling components.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable heat-treat response with standard oil quench
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal and fit-up
• Width tolerance of 0.000 to minus 0.005 inches — stock will not exceed nominal width
• Length tolerance of plus 0.250 inches, minus 0 — no short pieces
• Edge squareness held to 0.003 inches per inch across all edges
• Annealed condition — ready to machine, drill, mill, or grind before hardening

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for toolroom, die shop, and maintenance machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting and machining of tool steel flat stock is typically performed by machinists using standard milling, grinding, and drilling equipment. Heat treating to final hardness should be performed by qualified personnel following established procedures for AISI O1 oil-hardening steel. Wear appropriate PPE when cutting or grinding tool steel. All heat treatment operations involving open quench tanks should follow applicable shop safety standards and local regulations.