M5×30 Countersunk Machine Zinc Plating Screw

Description

M5×30 Countersunk Machine Zinc Plating Screw specifications for a standard M5×30 Countersunk Machine Screw with Zinc Plating: M5×30 Countersunk Machine Screw – Key Specifications Standard: ISO 2009-2011 / DIN 965 Material: Steel (typically carbon steel) Finish: Zinc plating (usually blue/yellow chromate passivation) 1. Dimensional Specifications Diameter (M5): 5mm (thread major diameter) Length: 30mm (under head length) Head Type: Countersunk (flat head, 90° included angle) Head Diameter: 9.2mm (typical) Head Height: 2.6mm (typical) Thread Pitch: 0.8mm (standard coarse thread) Drive Type: Cross recess (Phillips) or Slot 2. Mechanical Properties Strength Class: 4.8 (most common) or 8.8 (high strength) 4.8: Tensile strength = 400 MPa, Yield strength = 320 MPa 8.8: Tensile strength = 800 MPa, Yield strength = 640 MPa Hardness: 4.8: HV 130–180 8.8: HV 250–320 3. Corrosion Protection Zinc Plating: Typically 5–8µm thickness Passivation: Blue clear (most common) Yellow chromate (higher corrosion resistance) Salt Spray Test: White rust: ≥48 hours Red rust: ≥72 hours (yellow chromate) 4. Installation Specifications Countersink Angle: 90° (ISO/DIN standard) Recommended Hole Size: Clearance hole: 5.5mm (for M5 thread) Countersink diameter: 9.2mm (min) × 90° Torque Settings (for 4.8 grade): Steel-to-steel: 4–5 Nm Aluminum-to-aluminum: 3–4 Nm 5. Applications Electronics enclosures Machinery assembly Automotive components General manufacturing