Starrett 54087 O1 Tool Steel Flat Stock 0.25x10x18 in

Product Description

The STARRETT 54087 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require close-tolerance, machinable steel ready for heat treatment. It measures 0.25 inches thick, 10 inches wide, and 18 inches long, and weighs 12.75 pounds. The material conforms to AISI Type O1 specification, a tungsten-alloyed tool steel known for good machinability in the annealed state and predictable dimensional stability through the oil-quench hardening process. Thickness tolerance is plus or minus 0.001 inches, making it suitable for precision tooling, gauges, fixtures, and die components where consistent stock dimensions reduce setup time.

O1 flat stock at this size is commonly used in job shops, tool rooms, and maintenance departments for fabricating punches, dies, jigs, bushings, and wear plates. The 10-inch width and 18-inch length provide enough material to lay out multiple parts from a single piece or to machine a large single component such as a die block or fixture plate. It arrives in the annealed condition, ready for machining prior to hardening. Trade professionals working in precision manufacturing, mold making, or tool and die operations will find this stock appropriate for applications requiring controlled hardness after heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable hardening with minimal distortion during oil quench
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling applications
• Width tolerance of 0.000 to negative 0.015 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition — machines with standard HSS or carbide tooling before hardening

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock for use in tool rooms, die shops, and precision machining applications requiring annealed stock in this thickness, width, and length configuration.

Installation Notes

Machining and hardening of tool steel flat stock is performed by qualified machinists or tool and die makers using appropriate cutting tools, grinding equipment, and heat treatment furnaces. Follow established shop practices and applicable safety standards when handling, machining, and heat treating tool steel. Oil quenching must be performed with proper fire suppression equipment present and adequate ventilation. Always allow the workpiece to reach a safe handling temperature before post-quench inspection or tempering.