S-90969A280 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Withstands up to 140,000 psi for reliable performance in high-stress applications.
• Precision Class 3A Thread Fit – Ensures tight, secure fastening with minimal backlash in assemblies.
• Enhanced Grip & Anti-Slip Design – Knurled head texture and ultra-low socket profile prevent tool slippage during installation.
• Corrosion-Resistant Black Oxide Finish – Provides durable protection against rust in demanding industrial environments.
• High-Strength Alloy Steel Construction – Offers Rockwell C30 hardness for long-term durability and wear resistance.
• Optimized Shoulder Dimensions – Controlled shoulder diameter and length tolerances ensure consistent alignment and bearing support.
• Industry Compliance Ready – Meets RoHS 3 and REACH standards for safe use in regulated sectors.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in machinery, automation, and precision equipment. The alloy steel core, combined with a black oxide finish, resists wear and environmental degradation, making it ideal for repetitive-motion systems. The ultra-low socket head with knurling enhances torque transmission, reducing installation errors. Its Class 3A thread fit and coarse threading enable quick assembly while maintaining vibration resistance, crucial for conveyor systems, motor mounts, and robotic arms where shoulder screws provide exact pivot points or spacing.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a precise Class 3A thread fit. Key dimensions include a 9/16" head diameter, 3/8" shoulder diameter (tolerance: -0.004" to -0.002"), and 1/4" shoulder length (tolerance: -0.005" to 0.005"). Manufactured from alloy steel with Rockwell C30 hardness, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.