Fastener Material Selection Guide: Stainless, Carbon and Alloy Steel

Fastener Material Selection Guide: Stainless, Carbon and Alloy Steel

Fastener material directly affects strength, corrosion resistance and cost. Wrong selection may cause assembly failure or shortened service life. This guide compares three common material groups for correct selection by working conditions.

Stainless Steel: Corrosion Resistance First

304 stainless steel suits general indoor and mildly corrosive environments; 316 and 2205 duplex stainless steel serve coastal and chemical high-corrosion scenarios. Stainless offers moderate strength at higher cost for corrosion-critical applications.

Carbon Steel: Economy and Strength Balance

Low and medium carbon steel fasteners are low-cost and workable, used with zinc plating for general industrial and construction applications. Property classes such as 4.8 and 8.8 satisfy most conventional loads.

Alloy Steel: High-Strength Conditions

40Cr, 35CrMo and SCM435 alloy steels offer high strength after quenching and tempering. Classes 10.9 and 12.9 bolts serve heavy-load, impact and high-temperature conditions, with attention to hydrogen embrittlement and finishing.

Selection Points

Consider corrosion environment, load class, temperature and cost. For critical applications, combine material certificates, mechanical reports and salt spray tests, and consult professional suppliers when needed.

Zhuhai Jiali Hardware provides multi-material fastener selection and customization services.