S-91273A277 3/4"-10 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced durability and load capacity from Rockwell B55 hardness and 70,000 psi tensile strength
• Precise component alignment enabled by the substantial 2 1/4" shoulder length with tight tolerances
• Secure, non-slip installation thanks to the knurled socket head and 3/8" hex drive
• Reliable thread engagement with Class 2A fit and coarse 3/4"-10 UNC threads for quick assembly
• High shear resistance with minimum 35,000 psi shear strength for demanding applications
• Compliance with environmental standards including RoHS 3 and REACH for global industrial use

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in precision machinery, automation systems, and heavy-duty equipment. The 18-8 stainless steel material provides excellent corrosion resistance, reducing maintenance in humid or chemically aggressive settings. Its 2 1/4" shoulder length ensures accurate positioning of rotating parts like gears, pulleys, and linkages, minimizing wear and vibration. The coarse UNC threads and Class 2A thread fit facilitate rapid, secure fastening in high-vibration environments, while the knurled socket head with hex drive prevents tool slippage during torque-intensive installations. Ideal for robotics, conveyor systems, and industrial assemblies requiring repeatable precision and long-term reliability.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring precise dimensional control. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for regulated industrial and export markets.