Starrett 57017 O1 Tool Steel Flat Stock 0.5x1.25x18 in

Product Description

The STARRETT 57017 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. It measures 0.5 inches thick, 1.25 inches wide, and 18 inches long, with a shipping weight of 3.19 pounds. The material conforms to AISI Type O1 oil-hardening specification, a widely used tool steel known for its machinability in the annealed state and its ability to achieve high hardness after oil quench. Thickness and width tolerances run from plus 0.010 to plus 0.015 inches. Length tolerance is plus 0.25 inches. Edge squareness is held to 0.003 inches per inch, making it suitable for applications where flat, square stock is a starting requirement before final grinding or heat treatment.

This flat stock is suited for jobbing shops, tool rooms, and maintenance machining environments. Typical uses include blanks for punches, dies, gauges, jigs, and fixtures where the part will be finish-ground to final dimensions and then oil-hardened. It is appropriate for both short-run tooling and prototype work. Machinists and tool and die makers working in both industrial and small-shop settings commonly use O1 flat stock at this size range for medium-duty tooling that requires a hard, wear-resistant final surface.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat-treat response
• Thickness: 0.5 inches with plus 0.010 to plus 0.015 inches tolerance
• Width: 1.25 inches with plus 0.010 to plus 0.015 inches tolerance
• Length: 18 inches with plus 0.25 inches tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard-size O1 tool steel flat bar suitable for use wherever AISI Type O1 oil-hardening flat stock at 0.5 inches by 1.25 inches by 18 inches is specified.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified machinists or tool and die makers familiar with O1 steel procedures. Always follow appropriate shop safety practices when cutting, grinding, or heat-treating tool steel. Heat treatment, including oil quenching and tempering, should be performed in accordance with the steel manufacturer's published guidelines for AISI O1. Proper eye protection and heat-resistant equipment are required during hardening operations.