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Dimensions & Tolerances

Investment casting, often used for the production of parts with high precision requirements, places great importance on the dimensions and tolerances of the cast parts. Dimensions and tolerances can vary depending on design requirements and specific applications. Below are a few examples that provide general information about the common dimensions and tolerances used in investment casting:

  1. General Dimensions: Investment casting parts often have complex and unique geometries. Therefore, the dimensions of each part are determined according to design requirements. Parts are typically expressed in dimensions in millimeters or inches.
  2. Tolerances: The investment casting process can meet strict tolerance requirements. Tolerances can vary depending on the part’s dimensions, surface quality, and function. For example, surface coating requirements can affect tolerances. Tolerances commonly used in investment casting are ±0.1 mm or tighter. However, these tolerances can vary depending on specific applications and industries.
  3. Inner and Outer Diameters: Inner and outer diameters are usually defined with specific tolerances in investment casting parts. For inner diameters, the size and tolerance of the inner diameter can be critical. For outer diameters, the size and tolerance of the outer diameter are important.
  4. Wall Thickness: Wall thickness is another important feature to consider in investment casting. Tolerances can vary depending on the wall thickness and material properties.
  5. Sharp Edges and Corners: Sharp edges and corners are frequently used in investment casting parts. The precision of these sharp corners and edges can affect tolerances.
  6. Surface Quality: Surface quality is a significant factor in investment casting parts. Surface roughness and coating requirements can influence tolerances.


The dimensions and tolerances used in investment casting can vary greatly depending on specific applications and design requirements. During the design and production processes, the necessary precision and tolerances for specific parts should be carefully evaluated.

Tolerances According to NORM VDG P690

The tolerances for the ‘Investment Casting‘ process are determined by an international standard: VDG P690.

BRK Metal manufactures according to this standard, with Class D1 being the default standard.

  • Class D1: Standard tolerances
  • Class D2: Precise tolerances
  • Class D3: Extremely precise tolerances possible for a limited number of dimensions and/or surfaces.

Much of the production process at BRK Metal is automated. This leads to a reduction in process variation. Due to the presence of automation, the casting process is extremely consistent. This process allows BRK Metal to produce investment casting parts that are more precise than required by international standards.

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Why BRK Metal?

BRK Metal, conducting 60% of its production abroad, is an approved supplier for many well-known companies in Europe. With its young and talented team, BRK Metal, focusing on customer needs, has proven to be a reliable supplier by producing at affordable costs without compromising on quality, ensuring timely and seamless deliveries to its customers.

By adhering to the ISO 9001:2015 production principle, it has gained the satisfaction of many customers and has attracted more attention than companies unfamiliar with and not using the casting (investment casting) method, thanks to its investments in technological infrastructure.