S-91290A086 M20 x 220 mm DIN 912, ISO 4762 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Class 12.9 strength rating and 170,000 psi tensile strength ensure reliable performance under extreme mechanical stress, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The black-oxide coating on the alloy steel provides enhanced protection against rust and wear, extending the screw's service life in harsh environments.
• Precise Torque Application: The 17 mm hex socket drive allows for high-torque installation with standard tools, minimizing slippage and ensuring secure fastening.
• Optimized Thread Engagement: M20 coarse thread with 2.5 mm pitch and Class 5g6g fit offers quick assembly and strong holding power, ideal for high-vibration applications.
• Robust Material Integrity: Rockwell C37 hardness provides excellent resistance to deformation and wear, maintaining dimensional stability under repeated use.
• Versatile Partially Threaded Design: The 52 mm minimum thread length on a 220 mm shank allows for flexible clamping in varied material thicknesses, improving application adaptability.
• Global Compliance Assurance: Meets DIN 912/ISO 4762 standards and is RoHS 3 and REACH compliant, ensuring suitability for international industrial and regulated sectors.

Professional Applications & Engineering Value

This M20 socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive assemblies, and structural frameworks where high tensile strength and durability are paramount. The black-oxide alloy steel construction combats corrosion in humid or chemically aggressive settings, while the Class 12.9 rating ensures it withstands dynamic loads without compromising integrity. The coarse metric thread with a 2.5 mm pitch facilitates rapid installation in coarse-grained materials, reducing assembly time and enhancing joint reliability. Ideal for industrial fastening in construction, manufacturing, and equipment repair, this screw’s partially threaded rod design allows precise load distribution, minimizing stress concentration and preventing loosening under vibration.

Specification Summary & Compliance

This screw adheres to DIN 912/ISO 4762 specifications, with a Class 5g6g thread fit ensuring dimensional accuracy for consistent performance. It is manufactured from alloy steel with a Rockwell C37 hardness and 170,000 psi tensile strength, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use in global markets.