S-91273A921 5/16"-24 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise alignment and pivot points ensured by the 1-1/2" shoulder with tight length tolerance, reducing component wear and assembly time.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for reliable operation under significant mechanical stress.
• Secure, non-slip installation provided by the knurled head and 5/32" hex socket drive, allowing for high-torque application without tool slippage.
• Fine-thread reliability with 5/16"-24 UNF Class 2A threads offering excellent vibration resistance and secure fastening in precision assemblies.
• Consistent dimensional accuracy with Class 2A thread fit and controlled shoulder diameter tolerance, ensuring interchangeability and ease of assembly.
• Compliance with global standards including RoHS 3 and REACH, making it suitable for regulated industries and international supply chains.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and rotating assemblies. The 1-1/2" shoulder length acts as a precise axle or pivot, eliminating the need for separate bushings and reducing assembly complexity. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, which is vital in environments exposed to moisture, chemicals, or temperature variations. The UNF fine thread and Class 2A fit ensure a secure, vibration-resistant connection, preventing loosening in dynamic applications. Combined with a knurled head and hex socket drive, it allows for reliable, high-torque installation, making it an indispensable component for industrial equipment manufacturers seeking durability and precision.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder diameter tolerance is controlled between -0.004" to -0.002", and the shoulder length tolerance is maintained at -0.005" to 0.005" to ensure precise assembly. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets mechanical performance requirements with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for use in regulated industrial and electronic applications.