Starrett 57041 O1 Tool Steel Flat Stock 5/8 X 6 X 18 in

Product Description

The STARRETT 57041 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, punch fabrication, and general machining applications where a hardenable steel blank is required. It measures 0.625 inches thick, 6 inches wide, and 18 inches long, and ships in an annealed, machinable condition ready for layout, machining, and subsequent oil-quench hardening. Thickness and width tolerances run from +0.010 to +0.015 inches, with a length tolerance of +0.250 inches. Edge squareness is held to 0.003 inches per inch across all edges. Shipping weight is 19.13 pounds.

This flat stock is suited to tool and die shops, machine shops, and maintenance facilities that fabricate custom tooling, jigs, fixtures, gauges, or blanking punches. The AISI O1 designation means the material responds well to oil quenching, achieving high surface hardness while reducing the risk of warping or cracking compared to water-hardening grades. It is appropriate for both short-run prototype tooling and production-grade tool blanks where dimensional stock accuracy matters before heat treat.

Key Features

• AISI Type O1 oil-hardening tool steel in annealed, machinable condition
• Thickness: 0.625 inches with +0.010 to +0.015 inch tolerance
• Width: 6 inches with +0.010 to +0.015 inch tolerance
• Length: 18 inches with +0.250 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece package quantity with no minimum order beyond one unit

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock blank suitable for toolmaking, die fabrication, and fixture work in any shop environment requiring AISI Type O1 material in this size range.

Installation Notes

Machining and grinding should be completed before heat treatment. Oil quenching must be performed by a qualified tool and die maker or heat-treat technician following established metallurgical procedures for AISI O1 tool steel. Use appropriate cutting fluids and grinding coolants during machining to prevent surface overheating. Handle all tool steel stock with awareness of sharp edges and ensure proper personal protective equipment is worn during cutting and grinding operations.