S-91319A204 M5 ASME B18.3.3M, ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated nylon pellet thread locker, maintaining secure fastening from -50° to 250° F in demanding environments.
• Exceptional mechanical strength from alloy steel construction, providing 150,000 psi tensile and 84,000 psi shear strength for high-load applications.
• Precise alignment and bearing surface with a 16mm shoulder length and controlled diameter tolerance, reducing wear and simplifying assembly.
• Enhanced grip and tool engagement from the knurled head and 3mm hex socket drive, allowing for reliable installation even in tight spaces.
• Corrosion-resistant black oxide finish that protects against oxidation, extending service life in industrial settings.
• Accurate and reliable threading with Class 5g6g metric coarse thread (M5 x 0.8mm), ensuring consistent fit and reducing cross-threading risks.
• Broad compliance and quality assurance meeting ISO 7379, ASME B18.3.3M, RoHS 3, and REACH standards for global industrial use.

Professional Applications & Engineering Value

This M5 shoulder screw is engineered to address critical challenges in precision machinery and assembly lines. The alloy steel core, hardened to Rockwell C32, delivers high fatigue resistance, while the black oxide finish provides a durable barrier against rust in humid or abrasive conditions. The integrated nylon pellet thread locker secures the fastener against loosening from vibrations, common in automotive, robotics, and conveyor systems. The shoulder design with precise diameter and length tolerances acts as a pivot or spacer, minimizing misalignment and bearing wear in rotating assemblies. By combining metric coarse threads for quick installation and a hex socket drive for torque control, this screw streamlines maintenance and enhances operational reliability in high-stress industrial applications.

Specification Summary & Compliance

This shoulder screw features a Class 5g6g thread fit per ISO standards, ensuring dimensional accuracy for the M5 x 0.8mm coarse thread. Shoulder diameter tolerance is tightly controlled from -0.049 to -0.01 mm, and shoulder length tolerance from 0 to 0.25 mm, supporting precise engineering fits. Manufactured in accordance with ASME B18.3.3M and ISO 7379 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing safe and sustainable use in global markets.