Starrett 56961 O1 Tool Steel Flat Stock 3/16x1-1/4x18in

Product Description

The STARRETT 56961 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, punch fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.1875 inches thick, 1.25 inches wide, and 18 inches long. Thickness and width tolerances are held to +0.0100 to +0.0150 inches, with a length tolerance of +0.2500 inches. Edge squareness is held to 0.003 inches per inch across all edges. This stock ships ready for machining, grinding, or heat treatment by tool and die makers, machinists, and maintenance professionals working in precision fabrication environments.

O1 tool steel flat stock is commonly used in shop environments where a machinable, oil-quenching steel is required for tooling blanks, fixtures, gauges, punches, and dies. This piece is sized for small-format tooling work and can be cut, ground, and hardened using standard oil-quench methods. It is well suited for low-to-medium production tooling where dimensional stability after heat treat is important. Machinists and tool grinders working in job shops, maintenance departments, and manufacturing facilities are the primary end users.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness held to +0.0100 to +0.0150 inches for consistent stock removal planning
• Width tolerance of +0.0100 to +0.0150 inches
• Edge squareness: 0.003 inches per inch on all edges
• Ready for machining, grinding, or direct use as a tooling blank
• Compact 18-inch length suits benchtop and small-format tooling applications

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolmaking, die fabrication, and precision fixture applications where O1 material specification is required.

Installation Notes

Cutting, grinding, and heat treatment should be performed by qualified machinists or tool and die makers familiar with O1 tool steel procedures. Secure workpieces properly before machining or cutting operations. When heat treating, follow established oil-quench procedures appropriate for AISI O1 steel to avoid warping or cracking. Wear appropriate PPE including eye protection and heat-resistant gloves during any thermal processing.