S-91273A293 1"-8 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength, providing robust performance in demanding applications.
• Precise alignment and smooth rotation thanks to the standard shoulder fit and Class 2A thread fit, reducing wear and improving assembly accuracy.
• Easy installation and removal with a 1/2" hex drive and knurled head for enhanced grip, minimizing tool slippage and speeding up maintenance.
• Durable coarse UNC threads that resist stripping and allow for quick engagement, ideal for high-vibration settings.
• Consistent dimensional stability from tight tolerances on shoulder diameter and length, ensuring repeatable performance in precision machinery.
• Compliance with environmental standards including RoHS 3 and REACH, making it safe for global industrial use without hazardous substances.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, such as conveyor systems, robotic arms, and precision fixtures. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, extending service life in moist or chemical-exposed environments. With a 1"-8 UNC coarse thread and Class 2A fit, it ensures secure fastening with minimal backlash, while the knurled head and 1/2" hex drive facilitate quick assembly even in tight spaces. Its high tensile strength and Rockwell B55 hardness prevent deformation under heavy loads, reducing downtime and maintenance costs in applications like automotive jigs or packaging equipment.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. Dimensional tolerances include shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005" to ensure precision. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from restricted substances for safe industrial use.