Heavy EquipmentExcavator
Arm casting (excavator attachment arm, ~576 lbs, ZX-650 / EX1200)
Fatigue critical – excavation loading. Pin bore tolerance and perpendicularity to arm axis critical. Charpy impact test at −20°C recommended. PPAP for production parts.
Specifications
Material
Cast Steel ASTM A148 Gr105-85 / Gr120-95 (high strength for fatigue)
Material Class
Cast Steel
Applicable Standards
ASTM A148 Gr105
Service Conditions
impact loading
Common Processes
Resin sand / no-bake; Q&T heat treat (mandated for higher strength)
NDT & Inspection
UT (ASTM E446 Level 1–2); MT; dimensional CMM (pin bore diameters, alignment); Charpy impact; hardness
Typical Specs & Notes
Fatigue critical – excavation loading. Pin bore tolerance and perpendicularity to arm axis critical. Charpy impact test at −20°C recommended. PPAP for production parts.
⚠ Caveats
Fatigue critical – excavation loading. | Pin bore tolerance and perpendicularity to arm axis critical.