S-94361A131 5/16"-24 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 140,000 PSI, this shoulder screw reliably handles high-stress applications without failure, ensuring long-term structural integrity.
• Superior Corrosion Resistance: The black oxide finish provides excellent protection against rust and wear, extending service life in harsh industrial environments.
• Precision Thread Fit: Class 3A thread fit ensures tight, secure fastening with minimal play, reducing the risk of loosening under vibration or dynamic loads.
• Enhanced Grip and Control: The knurled head and hex drive design offer improved handling and torque application during installation, preventing slippage and damage.
• Accurate Alignment and Stability: The precisely machined 3/8" shoulder diameter with tight tolerances provides consistent alignment for rotating parts, minimizing wear and misalignment.
• High Durability: Made from alloy steel with Rockwell C32 hardness, this screw maintains its strength and shape under repeated use and heavy loads.
• Wide Compatibility: Features 5/16"-24 UNF fine threads for secure fastening in applications requiring fine adjustments and high clamping force.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common challenges in precision assemblies, such as maintaining alignment in rotating machinery and reducing friction in pivot points. The black oxide finish enhances corrosion resistance, making it ideal for environments exposed to moisture or chemicals, while the Class 3A thread fit and UNF fine threads ensure reliable, vibration-resistant connections in automotive, aerospace, and industrial equipment. The knurled head and hex drive facilitate easy installation with standard tools, reducing assembly time and improving safety. By combining high tensile strength and precise shoulder dimensions, this screw supports smooth operation and longevity in demanding applications like linkages, bearings, and guides.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNF thread standards for precise engagement, with a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" to ensure consistent performance. It is manufactured from high-grade alloy steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial use.