S-91319A221 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon pellet thread locker ensures secure fastening in high-vibration environments, maintaining integrity from -50° to 250°F.
• Superior strength for demanding applications: Made from alloy steel with 150,000 psi tensile strength and 84,000 psi shear strength for reliable performance under heavy loads.
• Precision alignment and spacing: The 10mm shoulder diameter with tight tolerance control provides accurate component positioning and smooth rotation.
• Enhanced corrosion resistance: Black oxide finish offers improved protection against rust and wear in industrial settings.
• Easy installation and removal: 5mm hex drive and knurled head allow for secure tool grip and efficient assembly, even in confined spaces.
• Global standard compliance: Manufactured to ISO 7379 specifications, ensuring interchangeability and reliability in international projects.
• Environmental and safety adherence: Compliant with RoHS 3 and REACH regulations, making it suitable for regulated industries.

Professional Applications & Engineering Value

This M8x1.25mm shoulder screw is engineered to address common industrial challenges such as component misalignment, vibration-induced loosening, and corrosion in harsh environments. The alloy steel construction and black oxide finish provide durability and resistance to wear, while the nylon pellet thread locker ensures that fasteners remain securely in place from -50° to 250°F, critical for machinery subjected to thermal cycling. The precision shoulder diameter of 10mm with controlled tolerances allows for exact positioning in assemblies like rotating shafts, linkages, and bearing mounts, reducing wear and improving operational efficiency. Ideal for industrial automation, automotive systems, and precision equipment, this screw delivers reliable performance where metric coarse threads and high tensile strength are essential for long-term service life.

Specification Summary & Compliance

This shoulder screw features M8x1.25mm coarse threads with a Class 5g6g thread fit for precise engagement, and a shoulder diameter tolerance of -0.049 to -0.01 mm for accurate alignment. It adheres to ISO 7379 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in global supply chains.