S-92210A023 4-48 x 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments and extended service life.
• Exceptional thread precision and reliability with Class 3A UNF fine threads, ensuring tight, secure, and vibration-resistant connections.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Efficient installation and flush fit thanks to the standard 82° countersink angle and 1/16" hex drive, allowing for a clean, low-profile finish.
• Full-threaded design provides maximum grip and load distribution along the entire 1/4" length.
• Compliance with major industry standards including ASME B18.3, ensuring dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This 4-48 UNF Class 3A flat head screw is engineered to address critical challenges in precision assembly and industrial maintenance. The 18-8 stainless steel construction, enhanced by a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it suitable for applications in electronics, aerospace, and marine equipment where corrosion resistance is paramount. The UNF fine thread and Class 3A fit ensure minimal backlash and superior holding power in thin materials or finely tuned mechanisms, reducing the risk of loosening under vibration. The combination of a hex drive and 82° countersink allows for easy, torque-efficient installation and a smooth, flush surface—essential in aerodynamic or aesthetic-critical designs. With a tensile strength of 70,000 psi, it reliably handles high-stress loads without failure, offering long-term durability and reduced maintenance cycles.

Specification Summary & Compliance

This screw features a 4-48 UNF fine thread with a Class 3A fit for precise dimensional control, fully threaded along a 1/4" length. It is manufactured in accordance with ASME B18.3 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.