S-91319A217 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon pellet thread locker maintains secure fastening in temperatures from -50° to 250° F, reducing assembly failures in dynamic environments.
• Exceptional load-bearing capacity: Alloy steel construction with 150,000 psi tensile strength and 84,000 psi shear strength ensures reliable performance under high-stress industrial conditions.
• Precision alignment and smooth rotation: Knurled head and 10 mm shoulder diameter with tight tolerances provide accurate component positioning and reduce wear in rotating assemblies.
• Corrosion-resistant durability: Black oxide finish enhances surface protection, extending service life in demanding applications without compromising dimensional integrity.
• Easy installation and removal: Hex socket drive (5 mm) allows for high-torque application with standard tools, speeding up maintenance and assembly processes.
• Consistent thread quality: Class 5g6g metric coarse threads (M8x1.25) ensure reliable engagement and interchangeability, minimizing cross-threading risks.
• Global compliance assurance: Meets ISO 7379 standards and environmental regulations (RoHS 3, REACH), supporting use in international supply chains.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The alloy steel core, hardened to Rockwell C32, provides robust resistance to deformation under cyclic loads, making it ideal for pivoting joints, gear assemblies, and conveyor systems where shoulder diameter accuracy is vital for alignment. The black oxide finish not only defends against rust in humid or abrasive settings but also reduces galling during installation. With its nylon pellet thread locker, the screw effectively counters vibration-induced loosening in automotive or automation components, ensuring long-term operational safety. By combining ISO 7379 dimensional consistency with high tensile and shear strength, this fastener delivers reliable performance in robotics, heavy-duty manufacturing, and precision instrument applications, reducing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to ISO 7379 specifications, with Class 5g6g thread fit ensuring precise tolerance control for the M8x1.25 coarse threads. The shoulder diameter (10 mm) and length (16 mm) maintain tight manufacturing tolerances, supporting consistent assembly fit. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety, while the material and finish meet industrial standards for durability and performance in regulated sectors.