S-91319A206 M5 ASME B18.3.3M, ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon pellet thread locker prevents loosening under dynamic loads, maintaining clamp force in temperatures from -50° to 250° F.
• Exceptional mechanical strength: Alloy steel construction provides 150,000 psi tensile strength and 84,000 psi shear strength for demanding applications.
• Precision alignment and bearing surface: 25mm shoulder with controlled diameter tolerance ensures accurate component positioning and reduces wear.
• Secure installation and removal: Hex socket drive with knurled head allows high-torque application and easy grip, even with gloves.
• Corrosion-resistant durability: Black oxide finish protects against oxidation, extending service life in industrial environments.
• Reliable thread engagement: Class 5g6g thread fit with coarse 0.8mm pitch ensures consistent fastening and reduces cross-threading risk.
• Broad compatibility: Standard metric M5 thread and compliance with major standards simplify sourcing and replacement.

Professional Applications & Engineering Value

This M5 shoulder screw delivers critical performance in precision assemblies where alignment, vibration resistance, and strength are paramount. The alloy steel core and black oxide finish combat wear and corrosion in machinery, automotive, and automation systems. Its 25mm shoulder length acts as a precise pivot or spacer, eliminating the need for additional bushings and reducing part count. The nylon pellet thread locker secures the joint against vibration-induced failure, a common issue in moving equipment. With a hex socket drive and knurled head, installation is secure and efficient, even in confined spaces. Engineered to ASME B18.3.3M and ISO 7379, it ensures dimensional consistency and reliability in high-stakes industrial applications.

Specification Summary & Compliance

This shoulder screw features a Class 5g6g thread fit per ISO standards, with shoulder diameter tolerance of -0.049 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm for precise assembly. It is manufactured in accordance with ASME B18.3.3M and ISO 7379 specifications. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial components.