S-97345A572 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance: Made from 316 stainless steel, this shoulder screw withstands harsh environments, reducing replacement frequency and maintenance costs.
• High Tensile & Shear Strength: With a 70,000 PSI tensile strength and 35,000 PSI minimum shear strength, it ensures reliable performance under heavy loads and stress.
• Precision Class 3A Thread Fit: The fine UNF thread and tight tolerances provide secure, vibration-resistant fastening for critical assemblies.
• Easy Installation & Grip: The knurled head and hex drive allow for quick, tool-friendly installation and removal, enhancing assembly efficiency.
• Accurate Shoulder Alignment: The precisely machined shoulder with controlled diameter and length tolerances ensures consistent part positioning and alignment.
• Compliance with Industry Standards: Meets ASME B18.3 specifications and is RoHS 3 and REACH compliant, ensuring safety and regulatory adherence for global use.
• Durable Construction: A Rockwell B79 hardness rating offers excellent wear resistance, extending the screw's service life in demanding applications.

Professional Applications & Engineering Value

This 1/4"-28 UNF shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and fastener failure in high-stress environments. Constructed from 316 stainless steel, it provides exceptional resistance to corrosion and chemicals, making it ideal for marine, chemical processing, and food industry applications. The fine thread spacing and Class 3A thread fit ensure a secure, tight hold that minimizes loosening from vibrations, crucial in machinery and automotive assemblies. The knurled socket head with a hex drive facilitates easy installation in confined spaces, reducing assembly time and improving workflow efficiency. Its robust shoulder design offers precise locating and pivoting functions, enhancing the accuracy and longevity of precision instruments and rotating mechanisms.

Specification Summary & Compliance

This shoulder screw features a 1/4"-28 UNF fine thread with a Class 3A fit for high precision, a shoulder diameter of 3/8" with tight tolerances, and a thread length of 3/8". It complies with ASME B18.3 standards for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and safety regulations for industrial use.