S-92981A799 M8 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Strength: Crafted from high-strength alloy steel with Rockwell C32 hardness and 140,000 psi tensile strength, ensuring reliable performance under high-stress conditions.
• Precision Shoulder for Accurate Alignment: Features a 150mm shoulder with tight diameter tolerance (-0.072 to -0.01 mm), providing exact positioning and reducing assembly errors in machinery.
• Corrosion-Resistant Black Oxide Finish: Offers improved resistance to rust and wear, extending the screw's lifespan in harsh industrial environments.
• Secure Hex Socket Drive: Equipped with a 5 mm hex drive and knurled head for easy, non-slip installation and removal with standard tools.
• Coarse Metric Thread for Quick Assembly: M8x1.25 coarse thread with Class 5g6g fit ensures fast, secure fastening and compatibility with metric systems.
• Compliance with Industry Standards: Meets ASTM A108, RoHS 3, and REACH regulations, guaranteeing safety and environmental responsibility.
• Versatile Knurled Head Design: Provides better grip during manual adjustments, ideal for applications requiring frequent adjustments or fine-tuning.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies, where exact alignment and high load-bearing capacity are essential. The alloy steel construction, combined with a black oxide finish, ensures long-term durability and resistance to corrosion, making it suitable for automotive, aerospace, and manufacturing equipment. The precisely machined 150mm shoulder with tight tolerances minimizes play and vibration, enhancing the stability of rotating parts like bearings and pulleys. Its coarse metric thread and hex socket drive simplify installation in confined spaces, reducing downtime and maintenance costs. By integrating these features, this shoulder screw delivers reliable performance in high-precision applications, supporting efficient and safe operations.

Specification Summary & Compliance

The screw adheres to precise dimensional standards, including a shoulder diameter tolerance of -0.072 to -0.01 mm and length tolerance of 0 to 0.25 mm, with a Class 5g6g thread fit for consistent metric threading. It complies with ASTM A108 for material specifications, RoHS 3 (2015/863/EU) for restricted hazardous substances, and REACH (EC 1907/2006) for chemical safety, ensuring it meets global regulatory requirements for industrial use.