Engineering basis

Sulfur, lead in legacy grades, bismuth, calcium or controlled inclusions may be used depending on grade and regional restrictions.

Standards, grades or methods

SAE 11xx resulfurized steels, 12L14 leaded steel and European free-cutting grades such as 11SMn30/11SMnPb30 are common examples.

Typical applications

Screws, fittings, bushings, connectors, hydraulic components, turned parts and automatic-lathe products.

Critical checks

Machinability improvements can reduce transverse ductility, weldability and fatigue performance. Lead-containing grades face environmental and regulatory restrictions.

Good engineering practice

Use the current governing code or specification and verify manufacturer data, material traceability and project-specific requirements. Where safety, pressure containment or structural integrity is involved, obtain approval from the responsible engineer before changing material, process or acceptance criteria.

Element Folio engineering reference. Requirements vary by standard, project and jurisdiction.