Starrett 53957 O1 Tool Steel Flat Stock 18 Inches

Product Description

The STARRETT 53957 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.0625 inches thick, 1.25 inches wide, and 18 inches long, with a weight of 0.4 pounds. O1 tool steel offers good machinability in its annealed state and responds well to oil-quench hardening, making it a standard choice for jigs, fixtures, punches, and cutting tools. Tight dimensional tolerances are held throughout, supporting direct use in precision fabrication without additional stock removal on thickness.

This flat stock is suited for machine shops, tool and die shops, and maintenance departments that need a reliable, ready-to-machine O1 bar in a thin, wide profile. The 0.0625-inch thickness makes it appropriate for thin-section tooling components, shim stock blanks, and template stock. Machinists and tool makers working in both job-shop and production environments will find this size useful for small punches, blades, and formed tooling where oil-hardening steel is specified.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable heat-treat response with oil quench
• Thickness tolerance of plus or minus 0.001 inches for precise, consistent stock
• Width tolerance of 0.0000 to 0.0050 inches under nominal
• Length tolerance of plus 0.250 inches over nominal
• Edge squareness held to 0.003 inches per inch across all edges
• Annealed condition allows machining, drilling, and grinding before hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolmaking, die making, and precision fabrication applications where AISI Type O1 material is specified.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool makers using conventional milling, grinding, and drilling equipment in its annealed state prior to heat treatment. Handle bar edges with care, as all edges are square and may be sharp. Oil-hardening heat treatment should be performed by qualified personnel following established metallurgical procedures for AISI O1 steel. Allow the material to reach ambient temperature before taking final measurements, as thermal expansion affects dimensional readings.