S-91273A578 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 2A thread fit guarantees smooth assembly and secure fastening in UNC coarse thread applications.
• Knurled socket head with hex drive provides superior grip and torque application, reducing tool slippage during installation.
• Durable Rockwell B55 hardness maintains structural integrity and wear resistance over extended use.
• 4-inch shoulder with standard fit offers accurate alignment and spacing in machinery and assemblies.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market suitability.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 1/4"-20 shoulder screw in 18-8 stainless steel with a black oxide finish addresses critical challenges like corrosion, misalignment, and mechanical failure. The UNC coarse threads and Class 2A fit enable quick, secure installations in equipment such as conveyor systems, robotic arms, and precision instruments, where vibration resistance and repeatability are essential. The knurled socket head enhances torque control, minimizing downtime during maintenance. Its high tensile and shear strength (70,000 psi and 35,000 psi, respectively) ensures longevity in high-stress applications, reducing replacement costs and improving operational efficiency.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 2A tolerance for precise fit, a shoulder diameter of 1/4" with tight tolerance, and a 4-inch shoulder length. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring adherence to environmental and safety regulations for industrial components.