S-90807A117 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in demanding industrial environments, extending service life.
• High Tensile Strength for Demanding Applications: Alloy steel construction with a 140,000 psi tensile strength ensures reliable performance under high stress and load conditions.
• Precision Thread Fit for Secure Assembly: Class 3A thread fit guarantees tighter tolerances and superior vibration resistance compared to standard fits, reducing the risk of loosening.
• Secure and Easy Installation: Hex socket drive with a knurled head offers excellent grip and torque transmission, facilitating quick and secure fastening with standard tools.
• Accurate Component Alignment: The precision-machined 1/4" diameter shoulder with controlled tolerances provides a reliable pivot or bearing surface for precise part location.
• Broad Industrial Compliance: Meets RoHS 3 and REACH environmental regulations, ensuring safety and suitability for global markets and sensitive applications.
• Optimized for High-Stress Environments: Rockwell C32 hardness provides a robust balance of strength and toughness, resisting deformation in mechanical assemblies.

Professional Applications & Engineering Value

This Alloy Steel Shoulder Screw is engineered to address critical alignment and high-load challenges in mechanical systems. The 1/4"-20 UNC coarse thread with a Class 3A fit ensures a secure, vibration-resistant connection, essential for machinery subject to dynamic forces. The precisely machined shoulder acts as a dependable journal or spacer, maintaining accurate component positioning in assemblies like linkages, pivots, and gear mechanisms. The black oxide finish significantly enhances corrosion resistance, making it ideal for industrial equipment, automotive applications, and manufacturing jigs exposed to harsh conditions. Its high tensile strength and hardened material provide long-term reliability, reducing maintenance needs and downtime in precision engineering and automation projects.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a precision Class 3A thread fit for superior engagement. Key dimensional tolerances include a shoulder diameter tolerance of -0.004" to -0.002" and a shoulder length tolerance of -0.005" to 0.005", ensuring high dimensional accuracy. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industrial and international markets.