Intelligence – Insight – Ingenuity

Linear Tolerances Across the Parting Line

Linear Tolerances 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.

HOW can MRT Castings help you?

I want...

New at MRT

Colosio Logo2

MRT Castings is delighted to announce the purchase of a new PFO250 fully automated, die casting cell, from Italian manufacturer Colosio.  

Read More
Southern 19

Visit us at stand C195 at the Farnborough Internaltional Exhibition & Conference Centre on 5th, 6th & 7th February 2019.

Read More
MRT-FactoryWizz Video

Around 6 months ago, we took a hard look at how we use the data we have available to us at MRT Castings. We looked at everything from data being used by machines, data being created by machines all the way through to where data is being left on the cutting room floor and where data can potentially be corrupted or lost through human error.

Read More