Starrett 54327 O1 Tool Steel Flat Stock 5/32x1-1/4x36 in

Product Description

The STARRETT 54327 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5/32 inches thick, 1-1/4 inches wide, and 36 inches long, with a weight of 1.99 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical. Licensed machinists, tool and die makers, and precision fabricators stock this material for producing jigs, fixtures, gauges, and cutting tools that require hardening after machining.

This flat stock is used in job shops, tool rooms, and maintenance machining environments where O1 tool steel is the specified material. O1 is a general-purpose oil-hardening steel that machines well in the annealed state and responds predictably to heat treatment. It is commonly used in low-to-medium production tooling, blanking dies, punches, and wear-resistant components. The 36-inch length provides a full working blank that can be cut to net rough length before finish machining and hardening.

Key Features

• AISI Type O1 oil-hardening tool steel — machines in annealed state, hardens with oil quench
• Thickness: 5/32 inches with plus or minus 0.001 inch tolerance
• Width: 1-1/4 inches with tolerance of 0.000 to minus 0.005 inches
• Length: 36 inches with plus 0.015 inch length tolerance
• Squareness held to 0.003 inches per inch on all edges
• Weight: 1.99 pounds per bar

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for general tool room, die making, and precision fabrication work where AISI O1 material specification is required.

Installation Notes

Cutting, grinding, and machining should be performed in the annealed condition prior to heat treatment. Heat treatment of O1 tool steel typically requires controlled atmosphere or protective wrapping to minimize decarburization, and should be performed by qualified personnel following established metallurgical procedures. Follow all applicable shop safety practices when cutting or grinding tool steel bar stock. Consult material data sheets for specific hardening, tempering, and quenching procedures before processing.