Starrett 53965 O1 Tool Steel Flat Stock 1/16x5x18 in

Product Description

The STARRETT 53965 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require a precision-ground blank ready for layout, machining, and heat treatment. Manufactured to AISI Type O1 specification, this flat stock measures 1/16 inch thick, 5 inches wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. The tight dimensional control makes it suitable for applications where stock removal before hardening must be kept to a minimum. At 1.6 pounds, the piece is manageable for bench or surface-plate work.

O1 tool steel flat stock in this size range is commonly used in precision tool and die shops, jig and fixture fabrication, punch and die blanks, and custom gauging applications. The 1/16 inch thickness is especially useful for thin punches, forming blades, and stripper plates where a ground, square-edged blank saves setup time compared to sawing from thicker bar stock. This item ships as a single piece and is appropriate for both production shops and prototype work requiring consistent material quality.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable, low-distortion heat treatment
• Thickness of 1/16 inch held to plus or minus 0.001 inches for precise stock allowance planning
• Width of 5 inches with a tolerance of minus 0.000 to minus 0.005 inches
• Length of 18 inches with a plus 0.250 inch length tolerance and no minus allowance
• Edge squareness held to 0.003 inches per inch on all edges
• Precision-ground surfaces reduce bench work and layout time

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for general tool and die, punch, fixture, and gauging applications requiring AISI Type O1 material in a 1/16 inch by 5 inch by 18 inch form factor.

Installation Notes

Machining and heat treatment of O1 tool steel should be performed by qualified toolmakers or machinists familiar with tool steel handling practices. Always follow established shop safety procedures when grinding, sawing, or milling tool steel, including the use of appropriate coolant to prevent surface decarburization. Heat treatment to harden O1 steel requires controlled atmosphere or appropriate quench media and should be performed according to the material supplier recommendations and applicable shop procedures. Handle ground surfaces with care to avoid nicks or corrosion prior to use.