5/16″ X 1 1/4″ X 18″ Starrett Oversize Precision Ground Flat Stock AISI O-1 Oil Hardened Steel 56991 Today Only

5/16″ X 1 1/4″ X 18″ Starrett Oversize Precision Ground Flat Stock | AISI O-1 Oil Hardened Steel | 56991 is Starrett precision ground flat stock, supplied ground flat, square and parallel in aisi o-1 oil hardened steel so it goes straight into layout, fixturing and machining work without further surfacing.

Precision ground surface provides a flat, true base for accurate machining setups

Oversize blank supports final dimensioning to exact thickness and width during finishing

AISI O-1 oil-hardened steel offers good machinability with stable wear characteristics

Long 18 inch form enables use in larger fixtures, jigs, and tooling projects

Suitable for milling, drilling, grinding, and fixture construction tasks

Specifications

Form: Oversize precision ground flat stock

Material: AISI O-1 oil-hardened steel

Thickness: 5/16 inch

Width: 1 1/4 inch

Length: 18 inch

Finish: Precision ground

Dimensions (approximate in product specs): 5/16 inch thick, 1 1/4 inch wide, 18 inch long

Applications

Tool and die shops for fixture bases and form blocks

Machining and fabrication shops needing reliable base stock for jigs and stops

Prototyping workflows and experimental setups requiring precise, flat stock

Metalworking environments where consistent surface flatness is critical for alignment and squaring