The Professional Choice for Aluminium, Aluminium Bronze & Gunmetal Castings

Tel +44 (1494) 786077

Fax +44 (1494) 791337


draycast foundries limited.

Chemical Composition


Copper         2.0-4.0

Zinc               0.5 max

Magnesium   0.20-0.60

Lead              0.1 max

Silicon           4.0-6.0

Tin               0.1 max

Iron              0.8 max

Titanium      0.2 max

Manganese   0.2-0.6

Nickel          0.3 max

Aluminium   Remainder

Others: each 0.05 max

Others: total 0.15 max

LM4 - Aluminium Casting Alloy

LM4 is a widely used general purpose alloy for most general engineering purposes. It is regularly used in junction boxes, gearboxes, tooling, gearboxes and electrical fittings where its moderate mechanical properties are desirable.Both thick and thin casting sections can be formed from LM4 aluminium castings and it finds addition uses due to its castings pressure tightness. When heat treated relatively high static loading can be maintained. LM4 is used in both sand and die casting.

Mechanical Properties


0.2% Proof Stress (N/mm2)              70-110

Tensile Strength (N/mm2)                 140-170

Elongation (%)                                  2-3

Impact Resistance Izod (Nm)            1.4

Brinell Hardness                                 65-80

Endurance Limit  (N/mm2)                 75

Modulus Of Elasticity (x103 N/mm2)  71

Shear Strength (N/mm2)                    150