S-90585A021 2-56 x 1/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant connections
• Enhanced surface durability through passivated finish, providing increased protection against oxidation and wear
• Optimized flush mounting with standard 82° countersink angle and flat head design for smooth, unobtrusive surface finishes
• Efficient installation and removal with hex drive (0.050") offering positive torque transmission and reduced cam-out risk
• Full thread coverage along the 1/8" length for maximum grip and load distribution in thin materials

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 2-56 UNC flat head screws address critical challenges in machinery assembly, electronic enclosures, and marine equipment. The 316 Stainless Steel material provides outstanding resistance to chlorides and acidic conditions, preventing failure in corrosive environments. The passivated finish further enhances this durability, extending service life. With a Class 3A thread fit and coarse threading, these screws ensure rapid assembly and high vibration resistance, reducing maintenance needs. The combination of 70,000 psi tensile strength and a hex drive allows for high clamp loads and reliable torque application, making them a trusted solution for precision engineering and B2B procurement in OEM and MRO sectors.

Specification Summary & Compliance

This product adheres to ASME B18.3 specifications for dimensional accuracy, including head diameter (0.197") and thread standards. Threads are manufactured to Class 3A tolerance for precise fit. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial use.