S-92949A573 1/4"-28 x 2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding industrial applications.
• Precision Class 3A thread fit with UNF fine threading delivers secure, vibration-resistant fastening and reduced risk of cross-threading.
• Hex drive design (5/32") allows for high-torque installation with standard tools, minimizing slippage and improving assembly efficiency.
• Fully threaded shank ensures consistent engagement along the entire length, enhancing grip and distribution of stress.
• Compliance with ASME B18.3, RoHS, and REACH guarantees adherence to rigorous mechanical and environmental standards for global supply chain compatibility.
• Rounded button head profile offers a low-profile, aesthetically clean finish while reducing the risk of snagging in assembled products.

Professional Applications & Engineering Value

Engineered for precision and durability, this 18-8 stainless steel rounded head screw addresses critical challenges in industrial assembly, such as corrosion-induced failure and thread loosening under dynamic loads. The UNF fine thread configuration and Class 3A fit provide superior resistance to vibration, making it ideal for machinery, automotive components, and electronic enclosures where reliability is paramount. The hex drive ensures efficient installation in confined spaces, while the passivated finish enhances surface hardness and longevity. With a Rockwell B55 hardness and full threading, it maintains structural integrity in high-stress applications, reducing maintenance cycles and total cost of ownership for B2B clients.

Specification Summary & Compliance

This screw meets ASME B18.3 specifications for dimensional accuracy, featuring a 1/4"-28 UNF fine thread with Class 3A tolerance for precise fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The manufacturing process adheres to strict standards for thread diameter (0.25") and length (2"), providing consistent performance in automated or manual assembly systems.