Starrett 54334 O1 Tool Steel Flat Stock 5/32x4x36 in

Product Description

The STARRETT 54334 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. It is manufactured from AISI Type O1 tool steel, a widely used oil-hardening grade known for its dimensional stability during heat treatment and its ability to hold a sharp edge after hardening. This bar measures 5/32 inches thick, 4 inches wide, and 36 inches long, weighing approximately 6.35 pounds. Thickness tolerance is plus or minus 0.001 inches, making it suitable for applications that demand tight dimensional control before and after machining.

O1 tool steel flat stock is a standard material in job shops, toolrooms, and maintenance departments. This bar is appropriate for fabricating punches, dies, blades, gauges, and fixtures where a machinable blank must later be hardened and ground to final dimension. The 4-inch width and 36-inch length provide sufficient stock for a range of medium-format tooling layouts. Machinists and tool-and-die makers typically rough-machine the blank in the annealed condition before sending it through oil-hardening heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening response and dimensional stability
• Thickness tolerance of plus or minus 0.001 inches for tight pre-machining fits
• Length tolerance of plus 0.015 inches, zero minus, ensuring full usable length
• Width tolerance of 0.000 to minus 0.005 inches for consistent stock width
• Edge squareness held to 0.003 inches per inch across all edges
• Annealed flat stock ready for machining, then oil-quench hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for general toolroom, die-making, and precision fabrication applications requiring an AISI Type O1 material specification.

Installation Notes

O1 tool steel flat stock is worked by tool-and-die makers and machinists using conventional milling, grinding, and drilling equipment while in the annealed state. After machining to near-net shape, the bar is oil-quench hardened per the material specification — heat treatment should be performed by qualified personnel following established metallurgical procedures. Wear appropriate PPE when cutting, grinding, or machining steel bar stock. Secure workpieces properly to prevent movement during machining operations.