S-94085A139 M8 x 8 mm ASME B18.3.6M, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Secure, Non-Marring Fastening: Brass soft tip (2.4mm length, 4.8mm diameter) provides excellent grip on shafts and components while preventing surface damage and galling.
• Superior Corrosion Resistance & Durability: Black-oxide finish on alloy steel enhances corrosion protection and wear resistance in demanding industrial environments.
• High Mechanical Strength: Rockwell C28 hardness ensures the screw maintains its form and clamping force under high vibrational and torsional loads.
• Precision Thread Fit for Reliability: Class 5g6g thread fit guarantees consistent, secure engagement with mating parts, reducing the risk of loosening.
• Easy Installation & Removal: 4mm hex drive in a headless design allows for flush mounting and straightforward servicing with standard tools in confined spaces.
• Optimized for High-Stress Applications: M8 coarse thread (1.25mm pitch) and 8mm length deliver strong holding power for permanent or adjustable positioning tasks.
• Global Compliance & Quality Assurance: Manufactured to ASME B18.3.6M, RoHS 3, and REACH standards, ensuring material safety and international interoperability.

Professional Applications & Engineering Value

This M8 set screw is engineered to solve critical challenges in precision assembly and motion control systems. The black-oxide alloy steel construction provides a robust base that resists corrosion and wear, extending service life in harsh conditions. Its Class 5g6g thread fit ensures minimal backlash and reliable performance in high-vibration environments like robotics, automotive components, and machinery. The integrated brass soft tip is crucial for applications requiring repeated adjustments—it bites securely into shafts or gears without marring surfaces, preserving part integrity. The headless design with a 4mm hex drive facilitates installation in tight spaces, making it ideal for securing collars, pulleys, and gears where protrusions are not permissible. This combination of material properties, thread precision, and tip technology delivers consistent clamping force and positioning accuracy, reducing maintenance downtime and enhancing overall system reliability.

Specification Summary & Compliance

This set screw features M8 coarse threads with a 1.25mm pitch and Class 5g6g thread fit per metric standards, ensuring dimensional accuracy and interchangeability. It is manufactured in compliance with ASME B18.3.6M for dimensional and mechanical consistency. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of hazardous substances and safe for use in regulated industries.