S-90807A115 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 140,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through black oxide finish, extending service life in demanding industrial environments
• Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
• Enhanced grip and handling from knurled socket head design, preventing tool slippage during installation
• Accurate component alignment through precisely machined 3/4" shoulder with tight diameter tolerances
• Robust material performance using alloy steel with Rockwell C32 hardness for durability and wear resistance
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global market acceptance

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision assembly applications where component alignment and rotational control are paramount. The 3/4" shoulder length provides precise bearing surfaces for gears, pulleys, and linkages, eliminating the need for additional spacing components. The black oxide finish significantly enhances corrosion resistance while maintaining dimensional stability in harsh operating conditions. With its UNC coarse thread and Class 3A thread fit, this fastener ensures rapid assembly and superior vibration resistance in automated manufacturing equipment, robotics, and precision machinery. The socket head with hex drive design allows for high-torque installation in confined spaces, making it ideal for maintenance-intensive industrial applications requiring reliable, repeatable fastening performance.

Specification Summary & Compliance

This precision shoulder screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for superior engagement and holding power. Critical dimensions include a 3/4" shoulder length with tight tolerance of -0.005" to 0.005" and 1/4" shoulder diameter maintained within -0.004" to -0.002" tolerance for precise component alignment. Manufactured from high-strength alloy steel with Rockwell C32 hardness and 140,000 psi tensile strength. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications.