Import Fastener Selection Guide for High-End Manufacturing

Import Fastener Selection Guide for High-End Manufacturing

Proper fastener selection is critical for equipment safety. Based on fastener.hk's brand specifications, this guide covers selection from industry scenarios, material, strength, anti-loose, precision and surface treatment.

1. Selection by Industry

• **New energy vehicles**: 12.9-grade alloy steel bolts (Hard-Lock) for chassis; Nord-lock washers for battery packs; PEM studs for interiors.

• **PV/energy storage**: 304 stainless steel for inland; 316 stainless steel + Nord-Lock for coastal areas; U-bolts for brackets.

• **Electronics/medical**: Micro PEM rivets and precision stainless steel screws (tolerance ±0.02mm) for non-magnetic and corrosion resistance.

• **Machinery/rail**: 12.9-grade bolts + Hard-Lock for heavy load and vibration resistance.

2. Key Selection Parameters

• **Strength**: 12.9-grade for automotive/machinery; 8.8-grade or stainless steel for PV/electronics.

• **Anti-loose**: Hard-Lock+Nord-Lock for vibration; Nord-Lock for general use.

• **Material**: Carbon steel for indoor; 304/316 stainless steel for outdoor/corrosion.

• **Surface**: Hot-dip galvanizing for outdoor; zinc plating for indoor (RoHS compliant).

3. Selection Taboos

Do not replace high-strength fasteners with ordinary carbon steel. Avoid mixing different materials to prevent electrochemical corrosion. Follow brand torque specifications to avoid breakage or loosening.