S-91273A161 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• High mechanical strength offering 70,000 PSI tensile strength and 35,000 PSI shear strength for demanding, high-stress applications.
• Precise shoulder fit and alignment with a 3" shoulder length and tight tolerances (±0.005"), ensuring accurate component positioning.
• Secure and efficient installation via a 1/8" hex socket drive and knurled head, providing excellent grip and torque transmission.
• Reliable thread performance with Class 2A UNC coarse threads, facilitating easy assembly and strong holding power.
• Compliance with environmental standards, being RoHS 3 and REACH compliant, meeting strict regulatory requirements for industrial use.
• Durable and wear-resistant with a Rockwell B55 hardness, ensuring longevity and consistent performance under repetitive loads.

Professional Applications & Engineering Value

This 1/4"-20 shoulder screw is engineered to address common industrial challenges such as misalignment and component wear in machinery. Made from 18-8 stainless steel, it provides superior corrosion resistance, making it suitable for applications in automotive, aerospace, and manufacturing where exposure to moisture or chemicals is a concern. The 3" shoulder length with precise tolerances ensures accurate pivoting and spacing in assemblies, reducing vibration and extending equipment life. The hex socket head and knurled texture allow for easy installation in tight spaces, while the UNC coarse threads and Class 2A fit ensure quick, secure fastening. Ideal for use in pivots, guides, and rotating mechanisms, this screw enhances operational efficiency and minimizes downtime in high-tensile environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Dimensions include a 1/4"-20 thread size, 3" shoulder length with a tolerance of -0.005" to 0.005", and a shoulder diameter tolerance of -0.004" to -0.002". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial components.