How to select the proper alloy for your zinc die casting application

Creco Cast manufactures small & miniature precision zinc die castings from a wide range of zinc alloys, including Zamak 2, Zamak 3, Zamak 5, Zamak 7, and ZA-8. While hand selecting the proper alloy for your specific application may seem a daunting task, our experienced engineering oriented staff will help you make the best selection for your next zinc die casting.

A broad range of mechanical and physical properties makes zinc an attractive choice for many applications. All data on this page represents approximates and are not absolutes. Data will vary according to alloys and may vary slightly according to the varying testing methods.

Mechanical Properties of Zinc Die Castings Alloys

	Zamak 2 XX1 (OBS)		Zamak3 AG40A		Zamak 5 AC41A		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 (% In 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	---	---	---
Compressive Yield Strength 0.1% Offset (psi x 10³ )	93⁴	---	60⁴	---	8.7⁴	---	60⁴	---	---	---

Physical Properties of Zinc Die Castings Alloys

	Zamak 2 XX1 (OBS)	Zamak3 AG40A	Zamak 5 AC41A	Zamak 7	Zamak 8
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
Coef. 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	.1
Pattern or Shrinkage	.006 in / in	.006 in / in	.006 in / in	.006 in / in	1/8 in / ft

Chemical Specifications (per ASTM) of Zinc Die Castings Alloys

	Zamak 2 XX1 (OBS)	Zamak3 AG40A	Zamak 5 AC41A	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 - .02	---
Zinc	Balance	Balance	Balance	Balance	Balance