S-97345A626 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 industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening in demanding applications.
• Enhanced installation control provided by the knurled socket head and 3/16" hex drive, reducing tool slippage and improving assembly efficiency.
• Accurate component alignment due to the standardized shoulder diameter and length, facilitating precise positioning in assemblies.
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured use in global markets.
• Optimized durability with Rockwell B79 hardness, resisting wear and deformation over repeated use cycles.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNC coarse thread and Class 3A thread fit provide superior resistance to loosening under vibration, a common issue in dynamic industrial environments. The knurled socket head enhances grip during installation, reducing the risk of stripping and ensuring consistent torque application. With a high tensile strength of 70,000 psi, it reliably supports axial and shear loads in applications like rotating shafts, pivoting mechanisms, and assembly jigs. The corrosion-resistant 316 stainless steel material ensures long-term performance in moist or chemically aggressive settings, minimizing maintenance needs and downtime. Its compliance with ASME B18.3 guarantees dimensional consistency, facilitating seamless integration into existing designs and reducing assembly errors.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial use.