S-97345A585 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
• Precise alignment and pivot functionality provided by the 3/8" shoulder with controlled diameter and length tolerances for reliable assembly.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength, ensuring durability under demanding loads.
• Secure, non-slip fastening enabled by the knurled socket head and 3/16" hex drive, allowing for high-torque installation without tool slippage.
• Fine thread accuracy with Class 3A UNF 1/4"-28 thread, offering excellent vibration resistance and a secure fit in tapped holes.
• Compliance with industry standards including ASME B18.3, ensuring dimensional consistency and interchangeability in professional applications.
• Environmental and safety compliance with RoHS 3 and REACH regulations, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision machinery, automation systems, and rotating assemblies. The knurled socket head and hex drive provide a secure grip for high-torque applications, reducing the risk of stripping and enhancing worker safety. The 1/4"-28 UNF fine thread with Class 3A fit ensures minimal backlash and superior vibration resistance, which is vital for maintaining alignment in dynamic equipment. The 3/8" shoulder acts as a precise pivot or spacer, eliminating the need for additional components and simplifying assembly. Made from corrosion-resistant 316 stainless steel, it performs reliably in moist, chemical, or high-temperature environments, reducing maintenance costs and downtime in industrial applications.

Specification Summary & Compliance

This shoulder screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/8" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring quality and regulatory adherence for professional use.