S-92981A325 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish on alloy steel provides superior protection against rust and wear in demanding industrial environments.
• High Tensile & Shear Strength: With 140,000 psi tensile and 84,000 psi minimum shear strength, this screw ensures reliable performance under heavy loads and stress.
• Precision Fit & Stability: Class 5g6g thread fit and precisely toleranced shoulder diameter (-0.072 to -0.01 mm) guarantee accurate alignment and reduced vibration in assemblies.
• Easy Installation & Grip: Hex socket drive (5 mm) and knurled head texture allow for secure tool engagement and manual handling, speeding up assembly processes.
• Consistent Quality & Compliance: Manufactured to ISO 7379 standards with RoHS 3 and REACH compliance, ensuring environmental safety and international interoperability.
• Robust Material Hardness: Rockwell C32 hardness offers excellent resistance to deformation, maintaining thread integrity over repeated use.
• Versatile Shoulder Design: 35 mm shoulder length with standard fit provides stable bearing surfaces for pivots, gears, and other mechanical components.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The alloy steel construction, combined with a black oxide finish, delivers exceptional corrosion resistance, making it ideal for automotive, aerospace, and industrial equipment exposed to harsh conditions. The metric coarse thread (M8x1.25mm) and Class 5g6g thread fit ensure secure fastening with high fatigue resistance, while the knurled socket head enhances grip during installation. Commonly used in assemblies requiring precise axial positioning—like linkages, rotating shafts, and bearing supports—this screw minimizes play and extends service life, reducing maintenance costs and downtime in B2B technical applications.

Specification Summary & Compliance

This shoulder screw adheres to ISO 7379 specifications, with thread dimensions conforming to Class 5g6g tolerance for metric threads. Key measurements include a shoulder diameter tolerance of -0.072 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm, ensuring high precision in manufacturing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial practices.