S-94128A165 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Crafted from high-strength alloy steel with Rockwell C32 hardness for superior wear resistance and long-term reliability in demanding industrial environments.
• Precise Alignment & Stability: Features a precisely fitted shoulder with a 5/16" diameter and controlled tolerances, ensuring accurate component location and reducing assembly misalignment.
• Superior Thread Engagement: Class 3A thread fit provides tighter tolerances for secure, vibration-resistant fastening in critical applications.
• Efficient Installation & Removal: The headless design with a slotted drive allows for flush mounting and easy access in confined spaces, speeding up maintenance and assembly processes.
• Robust Coarse Threading: 1/4"-20 UNC right-hand coarse threads offer quick assembly and high resistance to stripping, ideal for high-vibration settings.
• Regulatory Compliance Assurance: Meets RoHS 3 and REACH standards, ensuring environmental safety and suitability for global industrial supply chains.
• Optimized Shoulder Length: A 3/4" shoulder length provides ample bearing surface, distributing load evenly and enhancing the screw's load-bearing capacity.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address common challenges in machinery assembly, such as component slippage and misalignment. Made from alloy steel with a Rockwell C32 hardness, it withstands high-stress conditions in applications like rotating shafts, pivots, and gear assemblies. The headless slotted drive design allows for seamless integration into compact spaces, while the Class 3A thread fit and coarse UNC threading ensure reliable fastening that resists loosening under vibration. Ideal for use in automotive, aerospace, and industrial equipment, this screw provides a dependable solution for maintaining precise tolerances and improving overall system longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision, featuring a shoulder diameter of 5/16" (tolerance: -0.001" to 0") and shoulder length of 3/4" (tolerance: 0" to 0.005"). It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial components.