Starrett 54045 O1 Tool Steel Flat Stock 3/16x1x18 in

Product Description

The STARRETT 54045 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die-making, jig and fixture fabrication, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 3/16 inches thick, 1 inch wide, and 18 inches long and ships in an unhardened, machinable condition ready for heat treatment. Thickness tolerance is held to plus or minus 0.001 inches, and width tolerance runs from 0 to 0.005 inches on the minus side. Edge squareness is rated at 0.003 per inch across all edges. Machinists, tool and die makers, and metalworking professionals use this stock as raw material before oil-quench hardening.

O1 tool steel flat stock at these dimensions is a common starting blank for cutting tools, punches, dies, gauges, bushings, and small machine components where moderate toughness and good wear resistance after hardening are required. The 18-inch length provides enough material for multiple smaller blanks or one full-length component. Length tolerance allows up to 0.250 inches additional length on the long dimension, ensuring full usable stock after facing or squaring operations.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in the annealed state, hardens with oil quench
• Thickness held to plus or minus 0.001 inches for consistent stock removal calculations
• Width tolerance of 0 to negative 0.005 inches — stock will not exceed nominal width
• Edge squareness rated at 0.003 inches per inch on all edges
• Length tolerance of plus 0.250 inches ensures full nominal usable length
• Weighs 0.96 pounds per piece — easy single-operator handling

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat blank suitable for toolmaking, die-making, and precision machining applications where AISI Type O1 material specification is required.

Installation Notes

Machining and grinding of O1 tool steel flat stock should be performed by a qualified machinist or tool and die maker using appropriate cutting tools rated for tool steel. Heat treatment, including austenitizing and oil quenching, should follow AISI O1 specifications and be performed by qualified personnel with proper equipment. Eye and skin protection are required during cutting, grinding, and heat-treat operations. Allow material to fully cool after any thermal operation before handling or measuring.