S-91390A403 M4 x 3 mm DIN 916, ISO 4029 Set Screws

Key Features & Benefits at a Glance

• Enhanced Durability – Made from hardened alloy steel with Rockwell C45 hardness for superior wear resistance and long service life in demanding applications.
• Secure Fastening – Cup tip design provides excellent bite and prevents loosening under vibration, ensuring reliable component positioning.
• Efficient Installation – Hex drive style with 2 mm drive size allows for easy, high-torque installation using standard tools, reducing assembly time.
• Precision Fit – Class 5g6g thread fit and coarse thread spacing (0.7 mm pitch) enable quick, accurate alignment and robust engagement.
• Broad Compatibility – Conforms to DIN 916 and ISO 4029 standards, ensuring interchangeability and consistent performance in metric-based assemblies.
• Environmental Compliance – Meets RoHS 3 and REACH regulations, making it safe for use in various industries without hazardous substance concerns.
• Compact Design – Headless construction and 3 mm length save space, ideal for applications with limited clearance.

Professional Applications & Engineering Value

This M4 set screw is engineered to address critical industrial fastening challenges, such as maintaining precise alignment in machinery and resisting vibrational loosening in dynamic environments. The alloy steel construction, hardened to Rockwell C45, ensures high tensile strength and fatigue resistance, reducing the risk of failure under cyclic loads. Its hex drive and cup tip work synergistically—the hex allows for substantial torque application without slippage, while the cup tip digs into surfaces for a non-slip grip. Commonly used in automotive, aerospace, and manufacturing equipment, this metric set screw with right-hand coarse threads offers quick installation and reliable clamping force, making it a go-to solution for securing gears, pulleys, and other components where space and reliability are paramount.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including M4 x 0.7 mm thread with Class 5g6g tolerance per ISO metric specifications, ensuring accurate fit and performance. It meets DIN 916 and ISO 4029 manufacturing norms for consistency and quality. Additionally, the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from restricted substances and safe for industrial use globally.