S-94361A335 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Crafted from high-strength alloy steel with a Rockwell C32 hardness and 140,000 psi tensile strength, ensuring long-lasting performance in demanding industrial environments.
• Precision Thread Fit: Class 3A thread fit with 1/4"-28 UNF fine threads delivers superior accuracy and reliable fastening, minimizing the risk of loosening under vibration.
• Enhanced Corrosion Resistance: Black oxide finish provides a protective layer that significantly improves resistance to rust and wear, extending service life in harsh conditions.
• Secure and Easy Installation: Socket head with hex drive (5/32") and knurled texture offers excellent grip and torque application, reducing installation time and preventing tool slippage.
• Accurate Shoulder Positioning: Standard shoulder fit with precise diameter (5/16") and length (1 3/4") tolerances ensures consistent alignment and stability in machinery assemblies.
• Environmental Compliance: RoHS 3 and REACH compliant, meeting strict regulatory standards for safe use in various industries without harmful substances.
• Versatile Drive Design: Standard socket head profile with right-hand thread direction allows for easy integration into existing systems and quick maintenance.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment, where reliable shoulder positioning and thread accuracy are paramount. The Class 3A thread fit and UNF fine threads ensure tight tolerances, reducing play and enhancing load distribution in applications like rotating shafts, linkages, and bearing mounts. The black oxide finish adds a layer of corrosion resistance, making it ideal for environments exposed to moisture or chemicals, while the knurled head and hex drive facilitate secure installation without stripping. With a high tensile strength of 140,000 psi, it withstands heavy dynamic loads, minimizing failure risks in automotive, aerospace, and manufacturing setups. This shoulder screw delivers consistent performance, streamlining assembly processes and reducing downtime for maintenance.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and UNF fine thread specifications (1/4"-28). Shoulder dimensions are tightly controlled, with a diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring reliable performance in precision fasteners. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006), confirming environmental safety and regulatory adherence for industrial use.