Investment Casting Tolerance of Copper Alloy Castings

Precision Casting Dimensions Tolerance
Metric (mm) Imperial (Inches) Metric (mm) Imperial (Inches)
>10±0.18 >0.4＂±0.008” 63~100±0.28 2.5”~4.0”±0.02”
10~16±0.19 0.4”~0.6”±0.008” 100~160±0.31 4.0”~6.3”±0.02”
16~25±0.21 0.6”~1.0”±0.009” 160~250±0.35 6.3”~9.8”±0.02”
25~40±0.23 1.0”~1.6”±0.01” 250~400±0.39 9.8”~15.7”±0.02”
40~63±0.25 1.6”~2.5”±0.01”

Flatness

Castings can rely on straightening or integer methods to achieve precise dimension requirements. General tolerance is as below:

Metric (mm) Imperial (Inches) Metric (mm) Imperial (Inches)
>50±0.30 >2.0”±0.010” 100~150±0.50 4.0”~6.0” ±0.020”
50~100±0.38 2.0”~4.0” ±0.015” 150~200±0.75 6.0”~8.0” ±0.030”

Roundness
Length General Adjustable
<10 ±0.30mm ±0.20mm
11-25 ±0.45mm ±0.25mm
26-50 ±0.80mm ±0.3mm

Length
Length General Specific
<10 ±0.20mm ±0.20mm
11-25 ±0.25mm ±0. 25mm
26-50 ±0.30mm ±0.30mm
51-100 ±0.50mm ±0.45mm
101-150 ±0.65mm ±0.50mm
151-200 ±0.95mm ±0.55mm
201-250 ±1.25mm ±0.65mm
>251 ±0.60% ±0.40%

Angle Tolerance
Angle General Special
Internal and External Angle of Thin Piece ±1° ±30°
Internal Angle of Thick Piece ±2° ±30°
External Angle of Thick Piece ±2° ±1°

* Internal R angle
Internal R angle the bigger the better to increase the mechanical properties of castings and better dissolved liquidity. But big external R angle will increase the production cost of mold. Therefore, unless absolutely necessary, one should not specify external R angle to exceed R1.5mm and keep internal R angle in R1.5mm max ± 0.45mm can achieve good casting result under general condition.



General Product Development Schedule
Mold 2~4 weeks
Sample After mold completed 1~2 weeks
First Pilot Production After sample confirmed 3~4 weeks
Normal Delivery After order confirmed 4~7 weeks
Express Delivery 2~3 weeks (depending on the batch)