Interstate Screw Corp
Zamak Alloy Properties

Mechanical Properties Zamak 2
 Zamak 3
 Zamak 5
 Zamak 7 Zamak 8
  Die Cast Aged Die Cast Aged Die Cast Aged Die Cast Aged Die Cast Aged
Ultimate Tonsife Strength (psi x 10) 52 48 41 35 48 39 41 35 54 43
Yield Strength 0.2% Offset (psi x 10) --- --- --- --- --- --- --- --- 42 32
Elongation (% Within 2") 7 2 10 16 7 13 13 18 6-10 20
Shear Strength (psi x 10) 46 --- 31 --- 38 --- 31 --- --- ---
Hardness (Brinell) 100 98 82 72 91 80 80 67 95 - 110 91
Impact Strength (ft - lb) 352 52 432 412 482 40 2 432 412 312 132
Fatigue Strength Rotary Bend (psi x 10) (5 x 108cycles) 8.5 --- 6.9 --- 8.2 --- 6.8 --- --- ---
Fatigue Strength Compressive Yield Strength 0.1% Offset (psi x 103 ) 934 --- 604 --- 8.74 --- 604 --- --- ---
 
Chemical Properties &
Physical Properties		 Zamak 2 Zamak 3
 Zamak 5
 Zamak 7 Zamak 8
Copper 2.5 to 3.5 .25 max .75 to 1.25 0.10 .8 to 1.3
Aluminum 3.5 to 4.5 3.5 to 4.3 3.5 to 4.3 3.5 to 4.3 8 to 8.8
Magnesium .02 to .10 .020 to .05 .03 to .08 .01 to .02 .015 to .03
Iron max .10 .10 .10 --- .10
Lead Max .007 .005 .005 .002 .004
Cadmium max .005 .003 .003 .001 .002
Tin max .005 .003 .003 .001 .002
Nickel --- --- --- .005 - .020 ---
Zinc Remainder Remainder Remainder Remainder Remainder
Density (lb/cu in) .24 .24 .24 .24 .24
Melting Range (°F) 715 - 734 719 - 728 717 - 727 718 - 728 707 - 759
Electrical Conductivity (% IACS) 25 27 25 27 27.7
Thermal Conductivity (BTU / ft-hr2) 60.5 65.3 62.9 65.3 65.3
Coefficient of Thermal Expansion (68 - 212F) (u in / in F) 15.4 15.2 15.2 15.2 12.9
Specific H at (BTU / lb F) .10 .10 .10 .10 .10
Pattern or Shrinkage .006 in / in .006 in / in .006 in / in .006 in / in 1/8 in / ft
 

All data on this page represent approximates and are not absolute. Data will vary according to alloys and from lot to lot and may even vary slightly according to the varying testing methods.
This page last updated 14 May 2008.