S-97763A104 4-40 x 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides secure, consistent fastening with reduced risk of cross-threading
- Hex drive compatibility allows for efficient installation with standard tools, minimizing assembly time
- Fully threaded design offers maximum grip length and uniform stress distribution
- Rockwell B55 hardness maintains structural integrity and resists wear during repeated use
- Compliant with ASME B18.3, RoHS 3, and REACH ensuring safety, environmental responsibility, and industry acceptance
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to address critical challenges in precision assembly and demanding industrial applications. The Black-Oxide 18-8 Stainless Steel construction provides excellent resistance to corrosion and oxidation, making them suitable for electronics, machinery, and outdoor equipment where environmental factors are a concern. The coarse thread spacing and Class 3A thread fit ensure quick, secure fastening with high repeatability, reducing installation errors and maintenance downtime. Combined with the hex drive and button head profile, they offer a low-profile, tamper-resistant solution that maintains structural integrity in tight spaces, enhancing both performance and longevity in automated manufacturing and heavy-duty fastener systems.
Specification Summary & Compliance
This screw meets ASME B18.3 specifications for dimensional accuracy and features a Class 3A thread fit with UNC coarse threading for superior engagement. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial and commercial uses. The product adheres to strict manufacturing standards, providing consistent quality and reliability in every application.
