No gray iron is used in Stevens Modular Fixturing. Steel and ductile iron are used to give greater rigidity and better thread strength.

All clamping accessories, small and medium size Angle Plates, Utility Blocks, Vee Blocks, and all other locating components are made from hardened alloy steel or hardened ductile iron.

Dowels and bushings are hardened to 60 Rc. All locating holes in primary components and accessories are bushed.

Subplates, 2-Sided Angle Plates, and 4-Sided Columns are made from steel for maximum thread strength.

Careful furnace stress relieving is done on Subplates, Columns, and other components to ensure long term dimensional stability.

Critically stressed components are 100% magniflux inspected.