S-92949A903 4-48 x 1/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extended service life.
• Superior thread engagement and reliability due to Class 3A thread fit and UNF fine threading, minimizing the risk of loosening under vibration.
• High mechanical strength with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring durability under significant loads.
• Efficient and secure installation provided by the hex drive and fully threaded design, allowing for high torque application and maximum grip.
• Low-profile, rounded button head design offers a smooth finish and reduced snagging, perfect for applications where clearance is a concern.
• Compliance with major industry standards including ASME B18.3, ensuring consistent quality, interchangeability, and performance.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This 4-48 UNF fine thread rounded button head screw is engineered to address critical challenges in precision assembly and demanding industrial environments. Manufactured from 18-8 Stainless Steel with a passivated finish, it provides excellent resistance to oxidation and corrosion, making it a reliable choice for electronics, aerospace components, and medical devices exposed to moisture or chemicals. The Class 3A thread fit and fine UNF thread profile ensure a tight, secure connection that is highly resistant to vibrational loosening, a common failure point in machinery and equipment. The combination of 70,000 psi tensile strength and a compact button head with a hex drive allows for robust fastening in confined spaces, delivering long-term performance and reducing maintenance needs.

Specification Summary & Compliance

This screw features a 4-48 UNF fine thread with a Class 3A thread fit for high precision. Key dimensions include a 1/8" length, 0.213" head diameter, and 1/16" hex drive. It is fully threaded and manufactured to meet ASME B18.3 specifications. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.