- All parts ordered will be delivered on time, and beyond your expectations
- Compensation measures are available in case of any quality issues
- Support online remote check for acceptance Inspection
Tolerance Standard for CNC Machining
ISO 2768-1 defines general tolerances for linear dimensions as well as angular dimensions in CNC machining, such as external & internal size, step size, diameters, radii, distances, external radii and broken edge chamfers.
This standard covers 4 levels of tolerances.
If specific tolerances are not clearly indicated on the drawing, ISO 2768-mK standards will be followed by default.
- M – Medium tolerances
- F – Fine tolerances
- C – Coarse tolerances
- V – Very coarse tolerances
|Permissible deviations for ranges in nominal dimensions (mm )||Tolerance Class Designation (Description)|
|f (fine)||m (medium)||c (coarse)||v (very coarse)|
|0.5 up to 3||±0.05||±0.1||±0.2||–|
|over 3 up to 6||±0.05||±0.1||±0.3||±0.5|
|over 6 up to 30||±0.1||±0.2||±0.5||±1.0|
|over 30 up to 120||±0.15||±0.3||±0.8||±1.5|
|over 120 up to 400||±0.2||±0.5||±1.2||±2.5|
|over 400 up to 1000||±0.3||±0.8||±2.0||±4.0|
|over 1000 up to 2000||±0.5||±1.2||±3.0||±6.0|
|over 2000 up to 4000||–||±2.0||±4.0||±8.0|
Tolerance Standard for Casting
The tolerances of die casting are determined by both the material and the manufacturing method.
The tolerances specification for metal alloy castings are indicated in ISO 8062.
General tolerance grades for castings are (CT) 7 to 12.
The tighter tolerances are available on case by case.
|*Manual molding (CT9-CT12)||Semi-Automatic molding (CT9)||Horizontal molding machine (CT8)||Vertical molding machine (CT7)||Basic dimension (mm)|
Tolerance Standard for Injection Molding
The deviation of injection molded parts from nominal dimensions usually depends on the manufacturing process used.
Therefore, the tolerance requirements need to be taken into account when selecting the process.
DIN ISO 16742 and DIN ISO 20457 will be applied to the tolerance standards for injection molding.
Rigorous Quality Control Process
Our commitment to high quality to our customers comes from the sum of our many years of production practice as well as responsibility to our customers.
Our quality management runs through every step of the process from raw material selection to final inspection.
When a purchase order is placed, we will select from a list of material suppliers and request material certifications, as well as issue incoming inspection reports.
If necessary, chemical tests or physical property tests of the materials are exerted.
To increase your confidence in our custom fabricated as well as prototype parts, we can provide appropriate test reports on request, showing that material quality and product performance meet expected requirements.
We are committed to providing you with excellent service to boost your business.
To address your concerns and show our sincerity and ability, in case that the orders fail to cater to your expected requirements, we will process a rework or refund without hesitation.
The wishes of our clients will be put first.
- Unacceptable surface defects
- Fail to cater to specified tolerance criteria
- Unqualified materials
- The part can not be reprocessed
- Rework can not be accepted
- Other reasons