Starrett 54212 O1 Tool Steel Flat Stock 1x1.25x18 in

Product Description

The STARRETT 54212 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 1 inch thick, 1-1/4 inches wide, and 18 inches long and weighs 6.38 pounds. Thickness tolerance is held to +/- 0.001 inches, and squareness is maintained at 0.003 inches per inch on all edges. These tight tolerances make it well suited for applications where dimensional consistency before hardening is critical. Licensed machinists, tool and die makers, and skilled tradespeople handling precision fabrication work are the primary users of this material.

This flat stock is used in fabrication shops, tool rooms, and machine shops for producing punches, dies, gauges, jigs, and custom tooling. O1 tool steel is valued for its good machinability in the annealed state and its ability to achieve high surface hardness after oil quenching. The 18-inch length provides a workable blank for most standard tooling cutoffs. It is suitable for both light production and one-off tooling applications where ground flat stock is required prior to heat treat.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardenability after quench
• Thickness held to +/- 0.001 inches for precise pre-grind stock allowance
• Width tolerance of 0.000 to -0.005 inches maintains close sizing
• Length tolerance of +0.250 inches provides adequate cutoff allowance
• Squareness maintained at 0.003 inches per inch on all edges
• Single-piece packaging suitable for toolroom and small-shop ordering

Compatibility

Designed as a standard O1 oil-hardening flat stock blank compatible with conventional toolroom heat-treat processes requiring oil quench hardening of AISI Type O1 tool steel.

Installation Notes

Cutting, grinding, and machining should be performed by qualified machinists using appropriate tooling for hardened or semi-hardened steel stock. Always anneal or verify the material condition before machining to final dimensions. Heat treatment, including oil quenching and tempering, should follow recognized procedures for AISI O1 tool steel and be performed by personnel familiar with applicable shop safety practices. Wear appropriate PPE when cutting or grinding tool steel.