S-97345A204 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding, high-stress applications.
• Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder fit for reduced play and vibration.
• Easy installation and removal with a 5/32" hex socket drive and a knurled head for improved grip and torque application.
• Reliable performance in coarse-thread applications due to the 1/4"-20 UNC thread form, providing quick assembly and high resistance to loosening.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
• Durable and wear-resistant material with a Rockwell B79 hardness, maintaining integrity under repetitive loads.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision machinery and industrial assemblies. The Class 3A thread fit and standard shoulder fit minimize tolerance stack-up, ensuring accurate component alignment and reducing wear in rotating parts like bearings, pulleys, and linkages. The coarse UNC threads facilitate rapid assembly in high-volume production, while the knurled head and hex socket drive allow for secure handling in confined spaces. With high tensile and shear strength, it withstands dynamic loads in automotive, aerospace, and manufacturing equipment, preventing joint failure and maintenance downtime. The corrosion-resistant 316 stainless steel ensures longevity in moist or chemical-exposed environments, making it a reliable choice for industrial shoulder bolt applications requiring durability and precision.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with a Class 3A fit for precise thread engagement and tolerance control. It adheres to ASME B18.3 manufacturing standards, ensuring dimensional accuracy and performance reliability. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility. Specifications include a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", supporting consistent fit in precision shoulder screw applications.