S-94361A124 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: Crafted from high-strength alloy steel with Rockwell C32 hardness and 140,000 psi tensile strength for reliable performance in demanding applications.
• Precision Thread Fit: Class 3A thread fit ensures tight, secure fastening with minimal backlash, enhancing assembly accuracy and joint integrity.
• Superior Corrosion Resistance: Black oxide finish provides a durable, protective layer that resists rust and extends service life in harsh industrial environments.
• Secure & Easy Installation: Hex socket drive (5/32") combined with a knurled head offers superior grip and torque transmission, reducing the risk of stripping and simplifying maintenance.
• Accurate Shoulder Positioning: Features a 5/16" diameter shoulder with tight tolerances for precise alignment and smooth rotational movement in pivots, linkages, and guides.
• Fine Thread Advantage: 1/4"-28 UNF fine threads deliver enhanced clamping force and vibration resistance compared to coarse threads, ideal for precision equipment.
• Regulatory Compliance: Meets RoHS 3 and REACH environmental standards, ensuring safety and suitability for global industrial supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial assembly and precision machinery. The Class 3A thread fit and UNF fine thread design provide superior resistance to loosening under vibration, making it ideal for automated equipment, pivoting mechanisms, and jig/fixture construction. The black oxide finish not only enhances corrosion resistance but also reduces galling, which is crucial in high-cycle applications. The precisely machined shoulder (5/16" diameter, 5/8" length) acts as a reliable bearing surface or pivot point, eliminating the need for additional spacers and simplifying design. Its high tensile strength and Rockwell C32 hardness ensure it can withstand significant shear and axial loads, providing long-term reliability and reducing maintenance downtime in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to inch system measurements with a Class 3A thread fit for high precision. Key dimensional specifications include a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 5/8" (tolerance: -0.005" to 0.005"). The UNF fine thread (1/4"-28) is right-hand direction. The product is manufactured to industry standards and is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.