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Linear Tolerances Affected by Movements

These tolerances must be provided in addition to the linear dimensional tolerances where a core or moving die part affects a dimension.

Linear Tolerances Affected By Movement

Projected Area of Casting

Pressure Die Cast

 

Aluminium Alloy

Zinc Alloy

Up to 60 cm2

± 0.125mm

± 0.1mm

60 to 120 cm2

± 0.2mm

± 0.15mm

120 to 300 cm2

± 0.3mm

± 0.2mm

300 to 600 cm2

± 0.375mm

± 0.3mm

Projected Area of Casting

Gravity Die Cast

Sand Casting

 

Aluminium or Zinc Alloy with Metal Core

Aluminium or Zinc Alloy with Sand Core

Aluminium Zinc or Copper Alloys

Up to 60 cm2

± 0.25mm

± 0.375mm

± 0.5mm

60 to 300 cm2

± 0.375mm

± 0.625mm

± 0.875mm

300 to 600 cm2

± 0.375mm

± 0.75mm

± 1.125mm

600 to 1500 cm2

± 0.55mm

± 1.0mm

± 1.5mm

1500 to 3000 cm2

± 0.8mm

± 1.5mm

± 2.25mm

The values shown represent production practice at the most economical level. Greater accuracy involving extra work or care in production should be specified only when and where necessary.

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