Starrett 54106 O1 Tool Steel Flat Stock 5/16x1-1/2x18 in

Product Description

The STARRETT 54106 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable pre-cut blank for fabricating punches, dies, gauges, cutting tools, and fixtures. Made to AISI Type O1 specification, this flat stock measures 5/16 inches thick, 1-1/2 inches wide, and 18 inches long. Thickness tolerance is held to +/- 0.001 inches, giving machinists a consistent starting point before grinding or machining to final dimension. At 2.39 pounds per piece, the bar is easy to handle on a surface grinder or milling machine without additional staging support.

O1 tool steel is a general-purpose oil-hardening grade well suited to low-to-medium production tooling where dimensional stability through heat treatment matters. This flat stock is appropriate for job shops, tool rooms, and maintenance departments in industrial, manufacturing, and fabrication environments. It ships as a single 18-inch bar and is ready for layout, machining, and subsequent oil-quench heat treatment. No further cutting from a longer bar is required at the standard package quantity.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening response in oil quench
• Thickness held to +/- 0.001 inches for consistent grinding stock
• Width tolerance of 0.0000 to 0.0050 inches under nominal
• Length tolerance of +0.250 inches, never short of nominal 18 inches
• Edge squareness: all edges within 0.003 inches per inch
• Single-piece packaging — no partial bar cuts

Compatibility

Designed as a standard O1 oil-hardening flat stock blank suitable for general tool room and die shop applications requiring AISI Type O1 material in 5/16 x 1-1/2 x 18 inch flat bar form.

Installation Notes

Machining and grinding of O1 tool steel flat stock is typically performed by qualified toolmakers or machinists using conventional milling, surface grinding, or EDM equipment. Follow established shop safety practices when cutting or grinding tool steel, including appropriate eye protection and dust control. Heat treatment — including austenitizing temperature, soak time, and oil quench procedure — should follow the material manufacturer's published guidelines for AISI O1; do not substitute water or air cooling. Allow the bar to reach ambient temperature and inspect for flatness before scribing or machining to final layout.