S-90969A330 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in harsh industrial environments.
• High Tensile Strength for Demanding Applications: Alloy steel construction with 140,000 psi tensile strength ensures reliable performance under heavy loads.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit offers tighter tolerances, reducing the risk of loosening in high-vibration settings.
• Space-Saving Ultra-Low Profile Design: Socket head with ultra-low profile allows installation in confined spaces without compromising strength.
• Improved Grip and Easy Installation: Knurled head texture and 3/16" hex drive enable secure tool engagement and straightforward assembly.
• Accurate Shoulder Alignment: Standard shoulder fit with precise diameter and length tolerances ensures proper component positioning.
• Compliance with Environmental Standards: RoHS 3 and REACH compliant, meeting regulatory requirements for safe and sustainable use.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in machinery assembly, automation systems, and precision equipment. The 5/16"-18 UNC coarse threads with Class 3A fit provide exceptional resistance to vibration-induced loosening, while the black oxide finish enhances corrosion resistance in humid or chemically exposed environments. The ultra-low socket head profile and knurled texture facilitate easy installation in tight spaces, reducing assembly time. With a 140,000 psi tensile strength and Rockwell C30 hardness, it ensures long-term reliability in high-stress applications such as pivots, axles, and rotating mechanisms, minimizing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 3A thread fit for precise engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/4" with a tolerance of -0.005" to 0.005", ensuring accurate alignment. Manufactured from alloy steel and finished with black oxide, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety.