S-94496A540 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Made from high-strength steel with Rockwell B80 hardness, providing excellent wear resistance and long service life in demanding applications.
• Superior Corrosion Protection: Zinc plating finish significantly improves resistance to rust and environmental degradation, extending component lifespan.
• Precision Alignment: Features a smooth, unthreaded shoulder with tight diameter and length tolerances for accurate positioning and reduced component wear.
• High Load Capacity: Rated at 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance under substantial mechanical stress.
• Easy Installation: External hex drive and UNC coarse threads enable quick, secure fastening with standard tools, reducing assembly time.
• Consistent Fit: Class 2A thread fit guarantees reliable engagement and interchangeability, minimizing the risk of cross-threading.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, making it suitable for regulated industries and global supply chains.

Professional Applications & Engineering Value

This 1/4-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The steel construction combined with zinc plating provides robust corrosion resistance, ideal for machinery exposed to harsh environments. The unthreaded shoulder section (1-9/16" length) acts as a precise pivot or bearing surface, reducing wear on moving parts in applications like rotating shafts, linkages, and jigs. Its coarse UNC threads and external hex drive facilitate quick installation, while the high tensile and shear strengths ensure stability under dynamic loads. Commonly used in automotive, aerospace, and industrial equipment, this screw enhances assembly accuracy and operational reliability.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for consistent engagement and features UNC coarse threading (1/4"-20) with a 3/4" thread length. Shoulder dimensions include a 3/8" diameter and 1-9/16" length, manufactured to tight tolerances for precision. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006), ensuring environmental and safety standards are met for industrial use.