S-91273A171 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise alignment and smooth rotation due to the 3/4" shoulder with tight tolerances for reduced wear
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure, non-slip installation enabled by the knurled socket head and hex drive for reliable torque transfer
• Fine-thread reliability with 1/4"-28 UNF Class 2A threads ensuring vibration resistance and secure fastening
• Consistent durability backed by Rockwell B55 hardness for long-term mechanical integrity
• Global compliance assurance meeting RoHS 3 and REACH standards for safe, regulated use

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for applications in automotive, aerospace, and food processing equipment where environmental factors are a concern. The 3/4" shoulder length with controlled tolerances acts as a precise pivot or axle, reducing friction and preventing component misalignment. Combined with UNF fine threads, it ensures secure fastening under vibrational stress, enhancing the lifespan of assemblies. The knurled head provides improved grip during installation, facilitating efficient maintenance in tight spaces. Ideal for use in jigs, fixtures, and rotating mechanisms, this shoulder screw delivers reliable performance where dimensional accuracy and high tensile strength are paramount.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for consistent engagement and features a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precision assembly. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial applications.