Tiger Teeth Excavator 7Y0358 For E330 3HOLES Aftermarket Parts

Common Types and Characteristics of Screws Used in Construction Machinery

I. Machine Screws

1. Features: Requires pre-tapping of internal threads; fine thread pitch; high impact resistance (e.g., M8×1.25 coarse thread)

2. Typical Applications: Machine tool guideways, heavy equipment connections

II. Self-Tapping Screws

1. Features: Sharp tip for direct penetration into materials (e.g., ST4.2×25)

2. Typical Applications: Fastening thin metal sheets and plastic components

III. Self-Drilling Screws

1. Features: Integrated drill bit for simultaneous drilling and tapping (e.g., Type B self-drilling screws)

2. Typical Applications: Automotive sheet metal, steel structure installation

IV. High-Strength Bolts

1. Features: Grade 8.8 or higher strength (e.g., M12×50-10.9), tensile strength ≥1000MPa

2. Typical Applications: Construction machinery chassis, transmission systems