Import vs Domestic Fasteners: Material Standards

Import and domestic fasteners differ in material standards.

Material Standards:

• Low Carbon: SAE 1018 ≈ C15 ≈ 15#
• Medium Carbon: SAE 1035 ≈ C35 ≈ 35#
• Alloy Steel: SAE 4140 ≈ 42CrMo4 ≈ 42CrMo
• Stainless: 304/316 ≈ A2/A4

Selection Guide:

1. Export: ASTM or DIN
2. Domestic: GB standards
3. High-end: Import brands