S-91319A218 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with integrated nylon pellet ensures secure fastening in high-stress environments, preventing loosening under dynamic loads.
• Exceptional tensile and shear strength from alloy steel construction (150,000 psi tensile, 84,000 psi min shear) provides reliable performance in heavy-duty applications.
• Precision thread fit (Class 5g6g) guarantees smooth assembly and consistent clamping force, reducing installation time and improving joint integrity.
• Wide temperature tolerance (-50° to 250°F) allows stable performance in diverse operating conditions without compromising the locking feature.
• Corrosion-resistant black oxide finish enhances durability and provides a professional appearance while maintaining dimensional stability.
• Knurled socket head with hex drive offers superior grip and torque transmission, minimizing tool slippage during installation.
• Standardized shoulder dimensions ensure precise alignment and spacing in assemblies, reducing component wear and simplifying design integration.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The alloy steel construction, combined with Rockwell C32 hardness, provides exceptional resistance to wear and deformation under heavy loads. The integrated nylon pellet thread locker effectively counters vibration-induced loosening, a common failure point in dynamic systems like robotics, conveyor assemblies, and automotive fixtures. The coarse thread (M8x1.25mm) ensures quick installation and robust engagement in softer materials or where frequent disassembly isn't required. With its black oxide finish, the screw offers mild corrosion protection, making it suitable for indoor industrial environments where moisture or chemical exposure is moderate. The precise shoulder diameter and length facilitate accurate pivot points and bearing surfaces in linkages, pivots, and guiding mechanisms, reducing maintenance needs and enhancing operational reliability.

Specification Summary & Compliance

This shoulder screw features Class 5g6g thread fit per ISO metric standards, ensuring interchangeability and consistent performance. Shoulder diameter tolerance is maintained at -0.049 to -0.01 mm, with shoulder length tolerance of 0 to 0.25 mm for precise assembly fit. Manufactured in compliance with ISO 7379 for dimensional consistency, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industrial applications.