S-91390A681 M16 x 40 mm DIN 916, ISO 4029 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Rockwell C45 hardness alloy steel construction for reliable, long-term fastening in demanding applications
• Precise fine pitch threading (1.5mm) ensures a tighter, more secure fit and superior vibration resistance compared to coarse threads
• Optimized for flush mounting with a headless design and cup point tip that bites into the material for maximum anti-loosening security
• Streamlined installation and removal using a standard 8mm hex key, providing high torque capability in confined spaces
• Guanteed dimensional accuracy with Class 5g6g thread fit, ensuring consistent performance and interchangeability
• Full compliance with international standards including DIN 916 and ISO 4029 for guaranteed quality and global project acceptance
• Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting strict environmental and safety regulations

Professional Applications & Engineering Value

This M16 set screw is engineered to solve critical challenges in precision assembly and machinery. The alloy steel material, heat-treated to a Rockwell C45 hardness, provides the necessary strength to resist shear forces and prevent stripping under high stress. Its fine pitch metric thread offers a greater number of threads per unit length, creating a larger surface contact area. This is vital for applications requiring precise axial adjustment and exceptional vibration resistance, such as in securing gears, pulleys, and collars onto shafts. The headless hex drive design allows for a completely flush installation, making it ideal for space-constrained environments where protruding fastener heads are not an option. The cup point tip concentrates pressure to create a permanent indentation in the shaft, providing a powerful locking action that prevents components from slipping or rotating during operation.

Specification Summary & Compliance

This set screw conforms to the dimensional and tolerance requirements of DIN 916 / ISO 4029. The metric thread is manufactured to a Class 5g6g fit, ensuring high precision for the external thread tolerance. Key specifications include an M16 x 1.5mm fine thread, a 40mm length, and an 8mm hex drive. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and substance restrictions for use in various industrial markets.