S-97345A202 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 and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precision Class 3A thread fit ensures tight tolerances and secure fastening, reducing the risk of loosening under vibration.
• Enhanced grip and easy installation thanks to the knurled head texture and standard hex socket drive, allowing for efficient tool engagement.
• Robust shoulder design with precise diameter and length tolerances provides stable alignment and spacing in assemblies.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety for global use.
• Coarse UNC threading enables quick assembly and disassembly, saving time in maintenance and production cycles.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical needs in precision machinery, automotive, and aerospace sectors where alignment and durability are paramount. The Class 3A thread fit and coarse 1/4-20 UNC threads provide reliable fastening that resists vibration-induced failure, while the knurled socket head ensures secure tool engagement during installation. Its high tensile and shear strength makes it suitable for heavy-duty applications, such as mounting bearings or guiding moving parts, where consistent performance under load is essential. The shoulder diameter and length are manufactured to tight tolerances, offering precise positioning that minimizes assembly errors and enhances overall system reliability in demanding environments.

Specification Summary & Compliance

This shoulder screw features a 1/4-20 UNC coarse thread with Class 3A fit for high precision, alongside a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets industry standards for safety and environmental responsibility.