S-91390A109 M3 x 25 mm DIN 916, ISO 4029 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with cup point design that bites into materials for secure, vibration-resistant fastening
• Exceptional durability from Rockwell C45 hardness alloy steel construction that resists wear and deformation under load
• Precise installation control with 1.5mm hex drive that prevents tool slippage and ensures consistent torque application
• Reliable thread engagement through Class 5g6g thread fit that maintains dimensional accuracy for repeated assembly cycles
• Optimized for industrial environments with coarse thread spacing that enables quick installation and reduced cross-threading risk
• Global compliance assurance meeting DIN 916/ISO 4029 standards for consistent performance across international projects
• Environmental responsibility with RoHS 3 and REACH compliance for use in regulated applications worldwide

Professional Applications & Engineering Value

This M3 set screw delivers critical engineering value in applications where vibration resistance and permanent positioning are paramount. The alloy steel construction with Rockwell C45 hardness provides exceptional shear strength, preventing failure in high-stress assemblies. The cup point design creates concentrated pressure that digs into shaft materials, solving common slippage issues in pulleys, gears, and collars. With metric coarse threading (0.5mm pitch), installation is streamlined while maintaining Class 5g6g thread fit precision for consistent engagement in precision machinery, automotive components, and industrial equipment. The headless configuration and hex drive allow for flush mounting in space-constrained designs, making it ideal for set screw applications requiring both reliability and compact profiles.

Specification Summary & Compliance

This metric set screw features M3 x 0.5mm thread specifications with Class 5g6g thread fit tolerance ensuring dimensional accuracy per international standards. Manufactured to DIN 916/ISO 4029 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety requirements for industrial use across global markets.