MIL-HDBK-1897(AT)
5.1.11 Holes (cast or cored).
5.1.11.1 Concentricity. Limit in the relation of one diameter to another (see figure 5).
FIGURE 5. Concentricity tolerances for investment castings with holes.
5.1.11.2 Roundness. Holes, depending upon casting stresses, may be cast "egg-shaped" as indicated in table VIII.
TABLE VIII. Out-of-roundness tolerances for investment castings with holes.
Diameter |
TIR |
0.500 1.000 1.500 2.000 |
0.005 0.010 0.012 0.050 |
5.1.11.3 Tapered holes. Castings with tapered holes may, depending upon size, exhibit some shrinkage (sink) (see figure 6).
FIGURE 6. Angular tolerances for investment castings with tapered holes.
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