S-91273A168 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing maintenance costs.
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance under high-stress conditions.
• Precise alignment and smooth rotation due to the Class 2A thread fit and standard shoulder fit, minimizing assembly errors and wear.
• Secure, non-slip fastening enabled by the knurled head and hex socket drive, allowing for high-torque installation without stripping.
• Fine UNF thread design provides superior vibration resistance and clamping force in precision assemblies.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial markets.
• Optimized for durability with a Rockwell B55 hardness, offering excellent wear resistance and long service life.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The 1/4"-28 UNF fine thread and 3/8" shoulder length with tight tolerances ensure accurate positioning and smooth pivoting in assemblies like rotating shafts, gears, and linkages. Made from 18-8 stainless steel, it resists corrosion in demanding environments, from food processing to automotive systems. The hex socket knurled head allows for secure tool engagement, preventing slippage during high-torque applications. Ideal for industrial shoulder screw uses in robotics, conveyor systems, and precision instruments, it enhances operational reliability and reduces downtime.

Specification Summary & Compliance

The screw features a Class 2A thread fit per UNF standards, ensuring precise engagement, with shoulder diameter and length tolerances maintained for consistent performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its safety for industrial applications. Manufactured to high-quality benchmarks, it meets typical industry specifications for dimensional accuracy and mechanical properties.