Starrett 54170 O1 Tool Steel Flat Stock 9/16x1.5x18 in

Product Description

The STARRETT 54170 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 9/16 inches thick, 1-1/2 inches wide, and 18 inches long, with a weight of 4.31 pounds. Thickness tolerance is held to +/- 0.001 inches, and squareness along all edges is maintained at 0.003 inches per inch, making it suitable for applications where dimensional accuracy is critical. Machinists, tool and die makers, and industrial fabricators work with this material to produce punches, dies, gauges, and similar precision tooling components.

O1 tool steel flat stock is commonly used in job shops, production toolrooms, and maintenance facilities for fabricating custom tooling, fixtures, and wear parts. The oil-hardening designation means this material is heat-treated in oil quench processes to achieve hardness after machining. It is supplied in the annealed condition, allowing it to be cut, ground, and machined before hardening. This piece is appropriate for both one-off tooling projects and small-batch production runs where tight dimensional control is required from the raw stock.

Key Features

• AISI Type O1 oil-hardening tool steel construction for reliable heat-treat response
• Thickness held to +/- 0.001 inches tolerance for precision fitment
• Width tolerance of 0.0000 to -0.005 inches ensures consistent stock sizing
• Length tolerance of +0.250 inches provides slight overage for finish-cutting to final dimension
• Edge squareness maintained at 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolmaking and die-making applications requiring AISI Type O1 material at 9/16 inches thick by 1-1/2 inches wide by 18 inches long dimensions.

Installation Notes

This material is handled by machinists and tool and die makers using conventional milling, grinding, and sawing equipment. Always handle flat stock with appropriate lifting support to avoid bending thin sections. Heat treatment should be performed by qualified personnel following established AISI O1 hardening procedures and applicable shop safety standards. Wear proper PPE when cutting, grinding, or machining tool steel.