S-92949A319 1-72 x 1/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments.
• Exceptional thread precision with Class 3A fit and UNF fine threads ensures secure, vibration-resistant connections in precision assemblies.
• High tensile strength of 70,000 psi provides reliable load-bearing capacity for demanding industrial applications.
• Compact, low-profile rounded (button) head design offers a smooth finish and reduced snagging in tight spaces.
• Hex drive (0.050") compatibility allows for easy installation and high torque application with standard tools.
• Full threading along the 1/4" length maximizes grip and adjustability across the entire fastener.
• Compliance with ASME B18.3 and environmental regulations (RoHS 3, REACH) ensures product reliability and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

These 1-72 UNF fine thread rounded head screws are engineered to address critical challenges in precision machinery, electronics, and aerospace assemblies where space constraints and vibration resistance are paramount. The 18-8 stainless steel material combined with a passivated finish provides excellent resistance to oxidation and chemical exposure, extending service life in corrosive or high-humidity environments. The Class 3A thread fit and fine thread profile deliver superior clamping force and minimize loosening under dynamic loads, making them ideal for applications requiring repeated adjustments or exposure to thermal cycling. Their low-profile button head and hex drive design facilitate quick, secure installations in confined areas, reducing assembly time and improving overall structural integrity.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances per UNF standards, ensuring precise engagement and consistent performance. Manufacturing and dimensional requirements comply with ASME B18.3, guaranteeing interchangeability and reliability. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. Key specifications include a tensile strength of 70,000 psi, hardness of Rockwell B55, and a passivated surface treatment for enhanced durability.