Starrett 54342 O1 Tool Steel Flat Stock 3/16x1-1/2x36 in

Product Description

The STARRETT 54342 is an O1 oil-hardening tool steel flat stock bar intended for toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat bar measures 3/16 inches thick, 1-1/2 inches wide, and 36 inches long, weighing 2.87 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making this stock suitable for applications requiring close dimensional control before hardening. Machinists, toolmakers, and die makers working in production shops or job shops are the primary users of this material.

O1 tool steel flat stock is used in the fabrication of punches, dies, gauges, bushings, arbors, and general toolroom components. The oil-hardening characteristic of O1 means it can be through-hardened with minimal distortion compared to water-hardening grades, making it well suited for small to medium cross-section tools. This bar is supplied in the annealed condition, ready for machining to final shape before heat treatment. It is appropriate for both one-off toolroom work and short-run production tooling in manufacturing environments.

Key Features

• AISI Type O1 oil-hardening tool steel for good wear resistance and machinability in the annealed state
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal calculations
• Width tolerance of 0.000 to minus 0.005 inches for predictable fit in milled pockets and slots
• Length tolerance of plus 0.015 inches, minus 0 inches ensuring full usable length
• Edge squareness held to 0.003 inches per inch across all edges
• Supplied in annealed condition for straightforward machining prior to heat treatment

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom and die-making applications requiring oil-quench heat treatment.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate coolant to prevent localized heat buildup and work hardening of the surface. Heat treatment to final hardness should be carried out by a qualified heat treater following AISI O1 austenitizing and quench procedures. Always allow the bar to reach ambient temperature before taking finish measurements. Personal protective equipment including safety glasses and appropriate gloves is required when cutting or grinding.