Сообщение бесплатное
Прием сообщений ведущим доступен через telegram-бота.
Было бы вам удобно писать в эфир через бота в Telegram вместо сайта?
, which leads to unnecessarily expensive molds and high scrap rates.
for part sizes based on manufacturing effort and tooling.
One of the distinctive features of ISO 20457 is its use of surface profile tolerance within a specified datum system. This approach allows for comprehensive control over the entire surface form of the molded part, rather than piecemeal control of individual features. General tolerances are applied with surface profile tolerance linked to a defined datum reference frame, ensuring consistency across all integral features.
The benchmark for high-accuracy engineering components, such as gear systems, automotive connectors, and medical enclosures.
ISO 20457 specifies permissible dimensional and geometrical deviations for plastic molded parts. It applies to various manufacturing processes, including injection molding, compression molding, transfer molding, and rotational molding. iso 20457 tolerance table pdf
General tolerances for plastic molded parts according to ISO 20457 – TG6.
The global reference standard specifies the geometrical and dimensional tolerances and acceptance conditions for non-porous plastic molded parts. Officially introduced to replace the older German standard DIN 16742 , the ISO 20457:2018 Standard provides engineers, molders, and quality control professionals with a unified framework to manage the unique shrinkage, warpage, and thermal properties of molded polymers. Applying metal-machining tolerance standards like ISO 2768 directly to plastics often results in unachievable constraints and over-inflated production costs. Understanding the ISO 20457 Tolerance Groups
The ISO 20457 tolerance table, found within the standard’s PDF, is a cornerstone of modern geometric product specification. It translates the abstract concept of “general tolerance” into specific, actionable numbers for linear dimensions, angles, flatness, straightness, perpendicularity, and runout. By organizing these values into four clear classes (f, m, c, v), the standard balances manufacturing economy with functional assurance. For any design engineer or manufacturing professional, understanding how to read and apply the tables in ISO 20457 is not a niche skill—it is a fundamental practice that turns a drawing into a reliable, producible product.
Identify whether the feature is a molding-dimension (formed by a single mold component) or a closure-dimension (affected by moving mold parts like slides, lifters, or the parting line). Closure dimensions require wider tolerances. , which leads to unnecessarily expensive molds and
On your 2D drawing (PDF or CAD), add a general note: “All dimensions subject to ISO 20457:2020, tolerance grade PT3, Category A unless otherwise stated. Parting line dimensions subject to Category B multiplier.”
: Shrinkage rates vary across and along the polymer flow direction.
ISO 20457 is the international standard that establishes the general rules for determining dimensions and tolerances for thermoplastics pipes and fittings. It is the foundational document used by engineers and manufacturers to ensure that components from different suppliers fit together.
ISO 20457:2018 is the primary international standard for determining manufacturing tolerances and acceptance conditions for plastic molded parts. It replaces the older This approach allows for comprehensive control over the
ISO 20457 has become the global benchmark for tolerancing injection-molded plastic parts. By adopting this standard, designers and engineers can move away from guesswork and ambiguous specifications.
Do you have any that require high precision? Share public link
Plastic parts cannot be toleranced using metal-machining standards like . Polymers exhibit behavioral differences that require a dedicated standard:
, which leads to unnecessarily expensive molds and high scrap rates.
for part sizes based on manufacturing effort and tooling.
One of the distinctive features of ISO 20457 is its use of surface profile tolerance within a specified datum system. This approach allows for comprehensive control over the entire surface form of the molded part, rather than piecemeal control of individual features. General tolerances are applied with surface profile tolerance linked to a defined datum reference frame, ensuring consistency across all integral features.
The benchmark for high-accuracy engineering components, such as gear systems, automotive connectors, and medical enclosures.
ISO 20457 specifies permissible dimensional and geometrical deviations for plastic molded parts. It applies to various manufacturing processes, including injection molding, compression molding, transfer molding, and rotational molding.
General tolerances for plastic molded parts according to ISO 20457 – TG6.
The global reference standard specifies the geometrical and dimensional tolerances and acceptance conditions for non-porous plastic molded parts. Officially introduced to replace the older German standard DIN 16742 , the ISO 20457:2018 Standard provides engineers, molders, and quality control professionals with a unified framework to manage the unique shrinkage, warpage, and thermal properties of molded polymers. Applying metal-machining tolerance standards like ISO 2768 directly to plastics often results in unachievable constraints and over-inflated production costs. Understanding the ISO 20457 Tolerance Groups
The ISO 20457 tolerance table, found within the standard’s PDF, is a cornerstone of modern geometric product specification. It translates the abstract concept of “general tolerance” into specific, actionable numbers for linear dimensions, angles, flatness, straightness, perpendicularity, and runout. By organizing these values into four clear classes (f, m, c, v), the standard balances manufacturing economy with functional assurance. For any design engineer or manufacturing professional, understanding how to read and apply the tables in ISO 20457 is not a niche skill—it is a fundamental practice that turns a drawing into a reliable, producible product.
Identify whether the feature is a molding-dimension (formed by a single mold component) or a closure-dimension (affected by moving mold parts like slides, lifters, or the parting line). Closure dimensions require wider tolerances.
On your 2D drawing (PDF or CAD), add a general note: “All dimensions subject to ISO 20457:2020, tolerance grade PT3, Category A unless otherwise stated. Parting line dimensions subject to Category B multiplier.”
: Shrinkage rates vary across and along the polymer flow direction.
ISO 20457 is the international standard that establishes the general rules for determining dimensions and tolerances for thermoplastics pipes and fittings. It is the foundational document used by engineers and manufacturers to ensure that components from different suppliers fit together.
ISO 20457:2018 is the primary international standard for determining manufacturing tolerances and acceptance conditions for plastic molded parts. It replaces the older
ISO 20457 has become the global benchmark for tolerancing injection-molded plastic parts. By adopting this standard, designers and engineers can move away from guesswork and ambiguous specifications.
Do you have any that require high precision? Share public link
Plastic parts cannot be toleranced using metal-machining standards like . Polymers exhibit behavioral differences that require a dedicated standard: