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Pattern, Finish Allowance, and Wall Thickness
Metal Pattern Oversize Factor (each direction) Finish Allowance
(smaller number for larger sizes)
Min Wall
mm
(inches)
Aluminum 1.08 - 1.12 0.5 to 1.0 % 4.75 (0.187)
Copper alloys 1.05 - 1.06 0.5 to 1.0 % 2.3 (0.094)
Gray Cast Iron 1.10 0.4 to 1.6 % 3.0 (0.125)
Nickel alloys 1.05 0.5 to 1.0 % N/A
Steel 1.05 - 1.10 0.5 to 2 % 5 (0.20)
Magnesium alloys 1.07 - 1.10 0.5 to 1.0 % 4.0 (0.157)
Malleable Irons 1.06 - 1.19 0.6 to 1.6 % 3.0 (0.125)
Glossary