S-90344A143 M4 x 6 mm ASTM A574 Socket Head Screws with Flat Washer

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Integrated flat washer design distributes load evenly, minimizing surface damage and providing superior vibration resistance for long-term joint integrity.
• Black-oxide coating on alloy steel offers excellent corrosion resistance, extending service life in harsh industrial environments without compromising dimensional stability.
• Precision Class 6g thread fit guarantees smooth installation and secure fastening, reducing assembly time and improving production efficiency.
• Rockwell C39 hardness rating provides optimal balance between toughness and machinability, resisting wear and deformation under repeated use.
• 3mm hex socket drive allows for high-torque application with standard tools, preventing stripping and ensuring consistent clamping force.
• Full threading along the 6mm length enables maximum grip and adjustment flexibility in compact spaces, ideal for precision equipment assembly.

Professional Applications & Engineering Value

Engineered for industrial machinery, automotive systems, and precision equipment, this M4 socket head cap screw addresses critical challenges in vibration-prone and high-load environments. The black-oxide alloy steel construction combined with the integrated flat washer prevents loosening and surface galling, while the coarse metric thread (M4 x 0.7mm) ensures quick assembly without cross-threading risks. Its fully threaded design and hex drive facilitate secure fastening in confined spaces, making it indispensable for maintenance and manufacturing operations where reliability and compliance with international standards are paramount.

Specification Summary & Compliance

This socket head cap screw features M4 x 0.7mm coarse threads with Class 6g tolerance for precise fit, manufactured to ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial supply chains. The included flat washer (12mm OD, 1.4mm thickness) made from black-oxide steel complements the screw's dimensional accuracy and performance in standardized applications.