These figures are to be used with caution because most castings have several different shrinkage allowances according to their size, design, complexity, relative mass of core vs. metal, varying metal thickness, nature of metal, temperature of pouring and mold material.
Aluminum
Bismuth
Brass
Bronze
Aluminum Bronze
Manganese Bronze
Cast Iron
Cast Iron Wrought
Copper
Lead
Monel
Magnesium
Steel
Tin
Low Melting Point Alloy
Zinc
5/32
5/32
3/16
3/16
7/32
7/32
1/10-1/8
1/8
Material Shrinkage per foot
Material Shrinkage per foot
3/16
5/16
1/4
1/8-5/32
1/4
1/4
NIL
5/16
Patternmaking Index
fredericks_passage020001.jpg
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