S-91390A218 M4 x 20 mm DIN 916, ISO 4029 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with a cup point design that bites into surfaces for superior resistance against loosening under vibration and torque.
• High durability and wear resistance provided by alloy steel construction and a Rockwell C45 hardness, ensuring a long service life in demanding environments.
• Precise and reliable fit with Class 5g6g thread tolerance, offering consistent performance and ease of assembly in metric applications.
• Secure and efficient installation using a standard 2 mm hex drive, allowing for high torque application in confined, headless designs.
• Broad industrial compatibility due to compliance with DIN 916 and ISO 4029 standards, ensuring interchangeability and quality assurance.
• Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting strict environmental and health safety standards.
• Optimized for coarse thread applications with M4 x 0.7mm right-hand thread, enabling quick assembly and strong holding in various materials.

Professional Applications & Engineering Value

This M4 set screw is engineered to address critical challenges in precision machinery and assembly lines where vibration resistance and secure fastening are paramount. The alloy steel material, combined with Rockwell C45 hardness, ensures it withstands high stress and repetitive loads without deforming, reducing maintenance downtime. The cup point tip design provides a biting grip that prevents rotational slip, making it ideal for securing collars, gears, and pulleys on shafts in automotive, aerospace, and industrial equipment. Its headless and hex drive configuration allows for flush mounting in tight spaces, while the metric coarse thread ensures quick and reliable installation, enhancing overall assembly efficiency and product reliability.

Specification Summary & Compliance

This set screw features precise Class 5g6g thread fit per ISO metric standards, ensuring dimensional accuracy for M4 x 0.7mm coarse threads. It is manufactured in compliance with DIN 916 and ISO 4029 specifications, guaranteeing consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its safety for use in environmentally conscious and health-regulated applications.