S-90357A022 5/16"-18 x 3/4" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit ensures precise engagement and superior vibration resistance, maintaining joint integrity in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
• Ultra-low socket head profile allows installation in confined spaces while providing high torque capability with a 5/32" hex drive.
• Fully threaded design delivers consistent clamping force along the entire 3/4" length for maximum holding power.
• Rockwell C32 hardness ensures excellent wear resistance and durability under repeated loading conditions.
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory adherence for global industrial use.

Professional Applications & Engineering Value

These socket head cap screws are engineered to address critical challenges in precision assembly and heavy-duty machinery. The Black-Oxide Alloy Steel construction combined with Class 3A UNC coarse threads provides exceptional resistance to loosening under vibration, making them ideal for automotive, aerospace, and industrial equipment. The ultra-low profile head and fully threaded design enable secure fastening in tight spaces where clearance is limited, while the high tensile strength ensures reliable performance in structural applications. This combination of material properties and precise thread fit reduces maintenance needs and enhances operational safety in demanding environments.

Specification Summary & Compliance

This product features a 5/16"-18 UNC coarse thread with Class 3A precision tolerance, ensuring accurate fit and interchangeability. Dimensions include a head diameter of 7/16", head height of 7/64", and length tolerance of -0.005" to 0.005" for consistent performance. Manufactured from alloy steel with a Rockwell C32 hardness, it meets industry standards for strength and durability. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible industrial use.