Starrett 53955 O1 Tool Steel Flat Stock 1/16x3/4x18 in

Product Description

The STARRETT 53955 is an O1 oil-hardening tool steel flat stock bar intended for precision toolmaking, jig and fixture fabrication, punches, dies, and similar machined components. Manufactured to AISI Type O1 specification, this flat stock measures 1/16 inch thick, 3/4 inch wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. The tight dimensional control makes it suitable for applications where close fits and accurate stock sizing reduce downstream grinding time. Machinists, tool-and-die makers, and maintenance tradespeople working in metal fabrication shops are the primary users of this material.

O1 tool steel flat stock is commonly used in low-to-medium production tooling environments. It machines well in the annealed condition and is hardened by oil quench after austenitizing, making it a practical choice for small punches, blades, gauges, and wear parts. This piece, at 18 inches long, provides a workable blank length for single-piece or small-batch component machining without requiring initial cutoff from larger bar stock.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for precise stock sizing
• Width tolerance of 0.0000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine annealed flat stock in a single-piece quantity

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat blank suitable for machining into punches, dies, blades, gauges, and wear components in tool-and-die and maintenance machining applications.

Installation Notes

Cutting, grinding, and heat treating tool steel should be performed by qualified machinists or tool-and-die makers familiar with AISI O1 material handling. Secure the workpiece properly before any machining operation and use appropriate cutting fluids to manage heat at the cutting edge. Heat treating to final hardness requires controlled austenitizing and oil-quench procedures following the material specification — do not substitute water quench. Eye protection, chip guards, and proper ventilation are required during all machining and grinding operations.