S-91054A501 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Wear Resistance: TiCN coating significantly extends service life in high-friction applications, reducing replacement frequency and maintenance costs.
• Superior Corrosion & Chemical Resistance: Made from 18-8 Stainless Steel, offering excellent protection against rust and harsh industrial environments.
• High Tensile Strength & Durability: With a 70,000 PSI tensile strength and Rockwell B55 hardness, it withstands heavy loads and repeated stress without failure.
• Precise Alignment & Secure Fastening: Features a Class 2A thread fit and a precise shoulder for accurate component positioning and vibration resistance.
• Easy Installation & High Torque Application: The hex socket head with 3/16" drive allows for secure tool engagement and efficient tightening in confined spaces.
• Reliable Performance in Demanding Conditions: The coarse UNC thread ensures quick assembly and strong holding power in dynamic or high-vibration settings.
• Compliance with Environmental & Safety Standards: Meets RoHS 3 and REACH regulations, ensuring safety and sustainability for global industrial use.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and durability challenges in industrial machinery. The 18-8 Stainless Steel construction provides inherent corrosion resistance, ideal for environments exposed to moisture or chemicals. The TiCN coating adds a hard, low-friction surface that reduces wear in rotating assemblies, such as pivots, gears, and linkages, extending component life and minimizing downtime. With a 1/4" shoulder length and precise diameter tolerance, it ensures accurate positioning of parts like bearings or pulleys, preventing misalignment and reducing stress concentrations. The 5/16"-18 UNC coarse thread and hex socket head facilitate quick, secure installation in tight spaces, making it a reliable choice for automotive, aerospace, and heavy equipment applications where vibration resistance and long-term performance are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent, precise engagement. Key dimensions include a thread diameter of 0.313", thread length of 1/2", and shoulder diameter of 3/8" with tight tolerances (e.g., shoulder diameter: -0.002" to 0") to ensure reliable performance. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and environmentally responsible industrial use.