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Quality
Control is an important aspect of production at Beijing
Jingtian Precision Casting Ltd. It is recommended that
customers design castings in accordance with the following
technical assurance content and standard.
Tolerance:
1.Concentricity:
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External Diameter
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3/4"
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1"
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1 1/2"
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2"
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Inner Diameter
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1/4"
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1/2"
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3/4"
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1"
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TIR Eccentricity
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0.008
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0.010
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0.010
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0.016
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2.
Flatness and Straightness:
It should be remembered
that flatness and straightness tolerances deal with
bow only
and should not be confused with surface irregularity.
Tolerances
for flatness and straightness are 0.003---0.0055"/1" and
depend on alloy and configuration of casting.
3.Radii:
General
Tolerance: 0.016"/1"
Limit Tolerance: 0.005"/1"
4.Angular
Tolerance: ≤0.50°
5.Roundness:
Diameter:....
......................1/2"
.....1" .......1 1/2"
Roundness Tolerance TIR: 0.010...0.016... 0.024
Allowable tolerance after corrective action:
External Diameter:................1/2"
.....1" .......1 1/2" .......2"
Roundness Finished TIR:...0.006
..0.008
..0.010
...0.015
6.Hole Tolerance:
Best tolerances for holes are as follows:
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Hole Diameter
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Limit Tolerance
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~ 0.25"
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0.003〞/1〞
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~ 0.5"
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0.004"/1"
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> 0.5"
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0.005"/1"
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These tolerances apply to round holes, D-holes
and square holes.
7.Recommended Tolerances:
For all functional dimensions, the linear tolerance
table below should be used.
For non-functional dimensions, wider casting tolerances
will result in a more economical design.
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Inches
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Millimeters
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Dimensions
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Tolerance
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Dimensions
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Tolerance
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---0.250
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±0.005
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----3
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±0.100
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0.250---0.500
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±0.006
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3--------6
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±0.125
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0.500----0.750
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±0.007
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6--------10
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±0.150
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0.750----1.250
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±0.008
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10-------18
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±0.180
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1.250----1.750
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±0.009
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18-------30
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±0.200
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1.750----2.500
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±0.010
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30-------50
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±0.230
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2.500----3.500
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±0.012
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50-------80
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±0.260
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3.500----5.000
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±0.013
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80-------120
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±0.300
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5.000----7.000
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±0.014
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120------180
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±0.350
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7.000--10.000
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±0.016
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180------250
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±0.400
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10.00—16.000
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±0.017
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250------400
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±0.430
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16.00---25.000
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±0.018
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400------630
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±.0460
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25.00---40.000
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±0.020
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630------1000
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±0.500
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8.Wall Thickness Dimension Tolerance is exceptional,
conforms to ISO 8062-1996
Overall Dimension(mm):
Not more than 1400X600X600
Materials:
Aluminum Alloy, Copper Alloy, Ni-base Alloy,
Co-base Alloy, Stainless Steel and Other Steels.
Quality Standards:
American ICI, MIL, Chinese
HB963-90 and other Standards. Castings should
be
used at the request of customers.
The
lead time for mould and sample
Samples will be supplied in
4---6 weeks according to the complexity of product.
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