MIL-HDBK-1897(AT)
5.1.11.4 Blind holes. Blind holes are recommended for nonferrous alloys only. Blind holes can be cast in ferrous alloys, but no "rule of thumb" applies. See figure 7 for dimensional limits.
W - length |
Y - minimum diameter |
Draft |
0.250 0.500 0.750 1.000 1.250 1.500 2.000 2.500 |
0.187 0.250 0.500 0.625 0.750 1.000 1.000 1.000 |
0 0 0 0 0 15' 0 15' 0 15' 0 15' |
FIGURE 7. Blind hole limits for investment castings.
5.1.11.5 Rectangular holes. Tolerances for rectangular holes are shown in figure 8.
Radius |
z |
x |
Tolerance for x |
Y |
Tolerance for Y |
0.016 0.031 0.063 0.063 0.063 0.063 0.125 |
0.125 0.250 0.125 0.250 0.500 1.000 2.000 |
0.250 0.500 0.750 1.000 0.500 0.500 2.500 |
+0.004 +0.005 +0.005 +0.005 +0.005 +0.005 +0.015 |
0.125 0.250 0.500 0.750 0.150 0.250 1.500 |
+0.003 +0.004 +0.005 +0.005 +0.004 +0.004 +0.010 |
FIGURE 8. Tolerances for investment castings with rectangular holes.
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