Starrett 53987 O1 Tool Steel Flat Stock 3/32x5x18 in

Product Description

The STARRETT 53987 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, punches, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 3/32 inches thick, 5 inches wide, and 18 inches long. It holds a thickness tolerance of plus or minus 0.001 inches and a squareness tolerance of 0.003 inches per inch on all edges, making it suitable for applications that demand tight dimensional control. Weighing approximately 2.39 pounds per piece, it is sized for benchtop fabrication work by machinists, tool-and-die makers, and metalworking tradespeople.

O1 tool steel flat stock in this size range is commonly used to produce blanking dies, forming tools, jigs, fixtures, and cutting blades. The 5-inch width and 18-inch length give machinists and toolmakers enough material to lay out multiple smaller tool blanks or fabricate a single large component without additional welding or splicing. This stock is supplied in the annealed condition, ready for machining and subsequent oil-hardening heat treatment in a shop furnace or salt pot.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in the annealed state and responds predictably to heat treatment
• Thickness tolerance of plus or minus 0.001 inches for precise fit in close-tolerance die sets and fixtures
• Width tolerance of 0.000 to minus 0.005 inches maintains consistent stock removal planning
• Length tolerance of plus 0.250 inches provides extra material for facing and squaring operations
• Squareness of 0.003 inches per inch on all edges reduces setup time on surface grinders and mill tables
• Single-piece packaging with a minimum order quantity of one bar

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for general toolmaking, die-making, and precision metalworking applications requiring AISI Type O1 material specification.

Installation Notes

This material is supplied in the soft-annealed condition and requires heat treatment to develop working hardness. Machining, grinding, and layout work should be completed before hardening. Oil-hardening heat treatment must be performed by a qualified machinist or heat-treat technician following established metallurgical procedures for AISI O1 tool steel. Handle bar stock with care to avoid edge nicks that can propagate into cracks during the hardening cycle.