Starrett 54187 O1 Tool Steel Flat Stock 3/4 X 3/4 X 18 in

Product Description

The STARRETT 54187 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.75 inches thick, 0.75 inches wide, and 18 inches long, with a weight of 2.39 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications that require tight dimensional control before heat treatment. Machinists, tool and die makers, and precision fabricators work with this material when building punches, dies, gauges, and cutting tools that will be oil-quenched to final hardness.

O1 tool steel flat stock is a standard material in job shops, toolrooms, and maintenance departments where custom tooling is fabricated in-house. This bar is supplied in the annealed condition, ready for machining to final profile before oil-hardening heat treatment. The 18-inch length accommodates a wide range of tooling blanks without requiring additional cutoff from longer bar stock. It is commonly used in both low-volume production tooling and one-off repair or replacement tool situations.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat treat response
• Thickness and squareness tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to minus 0.005 inches for consistent stock sizing
• Length tolerance of plus 0.250 inches for reliable minimum usable length
• Edge squareness held to 0.003 inches per inch across all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard O1 tool steel flat bar for use in toolrooms and machine shops requiring AISI Type O1 oil-hardening material in 0.75-inch by 0.75-inch cross-section stock.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool and die makers using conventional milling, grinding, and turning equipment. Machine to final dimensions in the annealed state before heat treatment. Oil-hardening heat treatment should be performed by qualified personnel following established metallurgical guidelines for AISI O1 steel. Consult applicable shop safety standards when handling cutting fluids and quench oils during the hardening process.