S-91273A158 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the 2-1/2" shoulder with tight diameter and length tolerances
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Easy installation and removal with hex socket drive and knurled head for enhanced grip
• Reliable thread engagement through UNC coarse threading with Class 2A fit for secure fastening
• Durable wear resistance provided by Rockwell B55 hardness for extended service life
• Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to solve critical alignment challenges in industrial machinery, precision equipment, and automated systems. The 2-1/2" shoulder length with controlled tolerances provides exact positioning for rotating components, eliminating misalignment issues that cause premature wear. The UNC coarse thread with Class 2A fit ensures quick assembly while maintaining vibration resistance, while the knurled socket head allows for secure tool engagement in confined spaces. Made from corrosion-resistant stainless steel, it delivers long-term reliability in demanding environments where precision and durability are paramount.

Specification Summary & Compliance

This shoulder screw features 1/4"-20 UNC coarse threads with Class 2A thread fit for standard industrial applications. Shoulder diameter tolerance is -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental regulatory adherence for global industrial use.