S-90358A009 M4 x 20 mm Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Black-oxide coating on alloy steel resists corrosion and wear, extending service life in harsh industrial environments.
• High Tensile Strength: 140,000 psi tensile strength ensures reliable performance under heavy loads and vibration, reducing the risk of fastener failure.
• Precision Thread Fit: Class 5g6g thread tolerance provides consistent, secure fastening with minimal play, enhancing assembly accuracy.
• Space-Saving Design: Ultra-low socket head profile allows for installation in tight or recessed spaces, maximizing design flexibility.
• Easy Installation & Removal: 2.5 mm hex drive enables efficient torque application with standard tools, speeding up maintenance and assembly processes.
• Optimized for Coarse Thread Applications: M4 x 0.7 mm coarse thread pitch facilitates quick assembly and improved resistance to loosening in dynamic conditions.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This M4 socket head cap screw is engineered to address common challenges in precision machinery, automotive assemblies, and electronic enclosures where space constraints and vibration resistance are critical. The black-oxide alloy steel construction provides a durable, corrosion-resistant finish that withstands exposure to oils and moderate moisture, reducing maintenance needs. The ultra-low profile head and fully threaded design ensure a flush fit and full gripping power along the entire length, preventing joint failure in high-stress applications. With a coarse 0.7 mm pitch and Class 5g6g thread fit, these screws offer rapid installation and reliable holding power, making them ideal for production lines requiring efficiency and repeatability. Their high tensile strength and Rockwell C32 hardness further support use in structural components subject to dynamic loads.

Specification Summary & Compliance

This metric screw features an M4 thread size with a 0.7 mm coarse pitch and Class 5g6g thread fit, adhering to ISO tolerance standards for precision. The length is 20 mm with a tolerance of -0.127 mm to 0.127 mm, ensuring dimensional consistency. Manufactured from alloy steel with a black-oxide surface treatment, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting use in regulated industries without hazardous substances.