S-98052A426 M8 x 44.5 mm Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a four-arm thumb head design and zinc-plated cast iron construction for superior grip and durability in frequent adjustments.
• Exceptional corrosion resistance from the black-oxide steel finish, ideal for industrial environments where moisture or chemicals are present.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B84 hardness, ensuring reliable performance under heavy-duty loads.
• Precise and secure fastening with a fully threaded M8x1.25 coarse thread and Class 6g fit, providing consistent engagement and vibration resistance.
• Extended tip for easier alignment (4.5 mm length, 6 mm diameter), simplifying installation in pre-tapped holes or guides.
• Broad industrial compliance, meeting RoHS 3 and REACH standards for safe, environmentally conscious use in global markets.
• Robust head material using zinc-plated cast iron for enhanced wear resistance and long-term usability without stripping.

Professional Applications & Engineering Value

This M8 thumb screw is engineered to address common industrial challenges such as tool-free maintenance and corrosion-induced failure. The black-oxide steel body and zinc-plated cast iron head work synergistically to resist rust and wear, making it suitable for machinery, electrical enclosures, and assembly jigs where frequent access is required. The fully threaded design and Class 6g metric thread ensure uniform stress distribution and secure holds in coarse thread applications, reducing the risk of loosening under vibration. Its four-arm head allows for quick hand adjustments, streamlining operations in tight spaces or on production lines, while the extended tip aids in initial alignment, speeding up installation without compromising on the 70,000 psi tensile strength needed for demanding environments.

Specification Summary & Compliance

This thumb screw adheres to metric (M8 x 1.25 mm) threading standards with a Class 6g thread fit for precise dimensional accuracy. It is manufactured to comply with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006) as of January 17, 2023, ensuring regulatory conformity for industrial and electronic applications. The right-hand thread direction and coarse thread spacing are optimized for quick assembly, backed by a fully threaded 44.5 mm length and robust material properties.