S-92210A433 1/4"-28 x 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 for long-lasting performance in harsh environments.
• High-strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness to withstand significant mechanical stress.
• Precise, secure fastening ensured by Class 3A thread fit and UNF fine threads, minimizing the risk of loosening under vibration.
• Efficient installation and removal with a 5/32" hex drive, providing a positive grip and reducing tool slippage.
• Flush, streamlined mounting thanks to the standard flat head and 82° countersink angle, ideal for applications requiring a smooth surface.
• Full-length threading for maximum grip and adjustability along the entire 4" length, offering versatile fastening solutions.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This 1/4"-28 UNF flat head screw is engineered to address critical challenges in industrial assembly and machinery. The 18-8 stainless steel construction, enhanced by a passivated finish, provides exceptional resistance to corrosion and oxidation, making it ideal for use in moist or chemically aggressive environments. The Class 3A thread fit and fine thread spacing deliver superior clamping force and vibration resistance, crucial for high-precision equipment, automotive components, and structural frameworks. The hex drive design allows for high-torque application without cam-out, ensuring reliable fastening in heavy-duty applications. Its fully threaded design and right-hand thread orientation offer consistent holding power, reducing the risk of joint failure and maintenance downtime.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 3A thread fit and UNF thread type for high accuracy. It meets ASME B18.3 specifications, ensuring consistent manufacturing quality. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and safe for various industrial and international markets.