Starrett 54456 O1 Tool Steel Flat Stock 9/16x3/4x36 in

Product Description

The STARRETT 54456 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require a precision-ground, ready-to-machine steel blank. Ground to close tolerances, this bar measures 9/16 inch thick, 3/4 inch wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches. O1 tool steel is a general-purpose oil-hardening grade known for its ease of machining in the annealed state and its ability to achieve high surface hardness after heat treatment. This flat stock is suitable for fabricating punches, dies, gauges, jigs, and cutting tools in a machine shop or toolroom environment.

This flat stock is used in toolrooms, machine shops, and fabrication facilities where close-tolerance blanks are needed for custom tooling or fixture components. The 36-inch length provides ample material for multiple shorter parts. Width tolerance runs from 0.000 to minus 0.005 inches, and length tolerance is plus 0.015 inches with no negative allowance, meaning material is never short. Squareness on all edges is held to 0.003 inches per inch of width, making this bar suitable for direct layout and machining without additional stock removal on the faces.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in annealed state, hardens well in oil quench
• Thickness tolerance of plus or minus 0.001 inches for close-fit tooling applications
• Width tolerance of 0.000 to minus 0.005 inches — never oversized on width
• Length tolerance of plus 0.015 inches with no negative allowance — full-length material guaranteed
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch bar length provides flexibility for single or multiple-part blanks

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank for general toolroom and machine shop use where AISI Type O1 material specification is required.

Installation Notes

Cutting and machining should be performed by a qualified machinist using appropriate metalworking equipment. When heat treating to harden, follow established oil-quench procedures for AISI O1 tool steel and allow parts to temper promptly after quenching to reduce the risk of cracking. Always wear appropriate personal protective equipment when cutting, grinding, or heat treating tool steel. Verify final dimensions after any heat treatment cycle, as distortion is possible.