Tolerancing of die castings is highly dependent on the shape,
length and location of each feature as well as the alloy being
used for the application.
The most important factors when tolerancing a component are not
how tight any tolerance can be, or the process capability that
can be achieved, but what is needed to meet functional
requirements and which dimensions and features are critical.
Once specified, the appropriate process will be chosen to best
achieve them. There are cases when tolerancing is looser than is
desirable, leading to poor product quality and life. Equally,
there are cases when it is higher than necessary, which leads to
higher product cost and scrap rates. Tolerances should be as
tight as necessary, not as tight as possible.
Our standards exist as a guideline for designers. In all cases,
both standard and critical tolerances are covered. Standard
tolerances can be achieved in all cases, with good tool
maintenance, while critical die cast tolerances may be achieved
on a limited number of features through discussion with our
engineers. Where critical tolerances are not quoted, please
consult us. The tolerances achievable will be carefully
assessed, taking into consideration the form of the part, the
proximity of the feature within the tool and its relation to
other features on the part. Tool life and wear must be taken
into consideration with tolerancing as this will affect
short-term versus long-term process capabilities.
For specific suggestions on your application, please contact us
for a detailed analysis.
Multi-Slide Zinc Die Casting: Minimum Tolerances
|
mm |
in. |
Inside Diameter |
+/- 0.0125 ≤ 6.35 Diameter
+/- 0.0200> 6.35 Diameter |
+/- 0005” ≤ .250” Diameter
+/- 001” > .250” Diameter |
Linear Dimension |
Within Cavity |
+/- 0.0125 ≤ 25.4
+/- 0.0200 > 25.4 |
+/- .0005” ≤ 1.00”
+/- .001” > 1.00” |
Across Parting Line |
+/- 0.0250 ≤ 25.4
+/- 0.0350 > 25.4 |
+/- .001” ≤ 1.00”
+/- .0015” > 1.00” |
Conventional Zinc Die Casting: Minimum
Tolerances
|
mm |
in. |
Inside Diameter |
+/- 0.015 ≤ 25.4
Diameter
+/- 0.030 > 25.4 Diameter |
+/- .001” ≤
1.00” Diameter
+/- .0015” > 1.00” Diameter |
Linear Dimension |
Within Cavity |
+/- 0.025 ≤ 50mm
+/- 0.035 > 50mm |
+/- .001” ≤
2.00”
+/- .0015 > 2.00” |
Across Parting
Line |
+/- 0.0635 |
+/- .0025” |
Precision Aluminum Die Casting: Minimum Tolerances
|
mm |
in. |
Inside Diameter |
+/- 0.0508 ≤
25.4 Diameter
+/- 0.0762 > 25.4 Diameter |
+/- .002” ≤
1.00” Diameter
+/- .003” > 1.00” Diameter |
Linear Dimension |
Within Cavity |
+/- 0.0508 ≤
25.4 Diameter
+/- 0.013 per additional mm |
+/- .002” ≤
1.00”
+/- .0015” per additional inch |
Across Parting
Line |
+/- 0.0508 <
25.4 |
+/- .002” <
1.00” |
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