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Linear Tolerances for Dimensions Across the Parting Line

Projected Area of Casting	Pressure Die Cast
	Aluminium Alloy	Zinc Alloy
Up to 150 cm2	± 0.1mm	± 0.075mm
150 to 300 cm2	± 0.125mm	± 0.1mm
300 to 600 cm2	± 0.2mm	± 0.15mm
600 to 1200 cm2	± 0.3mm	± 0.2mm

Projected Area of Casting	Gravity Die Cast	Sand Cast
	Aluminium or Zinc	Zinc Alloy
Up to 60 cm2	± 0.25mm	± 0.5mm
60 to 300 cm2	± 0.375mm	± 0.875mm
300 to 600 cm2	± 0.5mm	± 1.125mm
600 to 1500 cm2	± 0.625mm	± 1.5mm
1500 to 3000 cm2	± 0.75mm	± 2.25mm

These tolerances must be provided in addition to the linear dimensional tolerances where a dimension is affected by the parting line.  They apply to dimensions both parallel and perpendicular to the parting line.

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.