Fan Favorite 5/16″ X 4″ X 36″ Starrett Precision Ground Flat Stock AISI O-1 Oil Hardened Steel 54401

5/16″ X 4″ X 36″ Starrett Precision Ground Flat Stock | AISI O-1 Oil Hardened Steel | 54401 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 flat faces along the full 36 inch length for repeatable setups and accurate machining

Versatile tool steel stock suitable for blade blanks, fixtures, jigs, and die components

O-1 steel offers reliable wear resistance and is readily heat treatable after initial machining

Long, single-piece stock minimizes joints and alignment errors when forming fixtures or tooling

Rectangular cross-section (5/16 inch by 4 inch) balances stiffness with machinability for broad applications

Specifications

Material: AISI O-1 Oil Hardened Steel

Type: Precision ground flat stock

Thickness: 5/16 inch

Width: 4 inch

Length: 36 inch

Hardening process: Oil hardened

Form: Solid rectangular stock

Dimensions: 5/16 inch thickness × 4 inch width × 36 inch length

Finish: Precision ground surfaces

Applications

Machine shops and tool and die makers for fixture plates, tool blanks, alignment blocks, and forming tools

Fabrication shops working on precision jigs, gauges, and prototype tooling

Educational labs and hobbyist setups requiring a reliable, flat steel stock for hands-on metalworking projects

Any workflow needing a flat, oil hardened steel stock ready for post-machining heat treatment