Starrett 54131 O1 Tool Steel Flat Stock 3/8x6x18 in

Product Description

The STARRETT 54131 is an O1 oil-hardening tool steel flat stock bar measuring 3/8 inch thick, 6 inches wide, and 18 inches long. Manufactured to AISI Type O1 material specification, this flat stock is used in toolmaking, die-making, and precision machining applications where consistent dimensional tolerances are critical. The thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications that require tight dimensional accuracy before heat treat. At 11.47 pounds per piece, this is a substantial bar suited for serious shop or toolroom use. Licensed machinists, toolmakers, and die makers are the primary users of this material.

O1 tool steel flat stock in this size is commonly used in the fabrication of punches, dies, gauges, cutting tools, and fixtures in both production shops and toolrooms. The 6-inch width and 18-inch length provide enough material for a range of blanks and formed tool components. This bar ships in the annealed condition, ready for machining prior to oil-hardening heat treatment. It is appropriate for both one-off toolroom jobs and short-run production setups where dimensional stability and machinability are priorities.

Key Features

• AISI Type O1 oil-hardening tool steel construction for consistent heat treat response
• Thickness tolerance of plus or minus 0.001 inches for precision fitment before hardening
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with a minimum order quantity of 1

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolroom, die-making, and precision machining applications requiring this material form and size.

Installation Notes

Machining and fabrication of tool steel flat stock should be performed by qualified machinists using appropriate cutting tools rated for tool steel. Material should be machined in the annealed condition prior to oil-hardening heat treatment. Follow established heat treat procedures and safety protocols when hardening, as improper quenching can cause cracking or distortion. Wear appropriate PPE when cutting, grinding, or handling raw steel stock.