S-91319A205 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 assembly integrity from -50° to 250°F.
• High-strength durability: Alloy steel construction with 150,000 psi tensile strength and 84,000 psi shear strength ensures reliable performance in demanding applications.
• Precision alignment: 20mm shoulder length with controlled diameter tolerance provides accurate component positioning and reduces wear.
• Corrosion-resistant finish: Black oxide coating enhances surface protection and extends service life in industrial environments.
• Secure installation: Hex socket drive with knurled head allows for high-torque application and easy handling during assembly.
• Standardized compatibility: Metric M5x0.8 coarse thread with Class 5g6g fit ensures interchangeability and consistent fastening.
• Regulatory compliance: Meets ASME B18.3.3M standards and RoHS 3/REACH regulations for global quality and environmental safety.

Professional Applications & Engineering Value

This M5 shoulder screw is engineered to address critical alignment and vibration challenges in precision machinery. The alloy steel core, hardened to Rockwell C32, provides exceptional fatigue resistance for rotating assemblies like motors, gears, and pivots. The 20mm shoulder length acts as a precise bearing surface, eliminating misalignment and reducing bushing wear in automated equipment. With its nylon pellet thread locker, it secures components exposed to constant motion, preventing downtime in conveyor systems or robotics. The black oxide finish offers mild corrosion protection suitable for controlled industrial environments, while the hex socket drive enables flush mounting in space-constrained designs. Ideal for OEM manufacturing and maintenance, this screw delivers reliable performance in applications demanding exact tolerances and sustained clamping force.

Specification Summary & Compliance

Manufactured to ASME B18.3.3M specifications with ISO 7379 alignment, this shoulder screw features Class 5g6g thread fit for precision engagement. Shoulder diameter tolerance is controlled between -0.049 to -0.01 mm, with shoulder length tolerance of 0 to 0.25 mm. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use.