S-92949A429 8-40 x 1/2" Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and washdown applications
• Exceptional thread engagement and vibration resistance from the extra fine 8-40 thread and Class 3A fit, ensuring a secure, reliable connection
• High-strength performance with a 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical assemblies
• Streamlined, low-profile installation thanks to the rounded button head and 3/32" hex drive, preventing snagging and allowing for a flush finish
• Maximum grip and holding power from the fully threaded 1/2" length, providing consistent clamping force along the entire fastener
• Guaranteed material safety and compliance by meeting RoHS 3 and REACH regulations, ensuring suitability for sensitive industries
• Precision manufacturing to UNS/UNF standards for reliable interchangeability and consistent performance in OEM and MRO applications

Professional Applications & Engineering Value

This 8-40 extra fine thread rounded head screw is engineered to solve critical challenges in precision assemblies where space is limited and vibration is a concern. The Class 3A thread fit provides a tighter tolerance than standard fits, minimizing the risk of loosening under dynamic loads in machinery, electronics, and automotive components. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to oxidation and corrosion, making it a durable choice for medical devices, instrumentation, and food processing equipment. The combination of the low-profile button head and 3/32" hex drive allows for secure installation in recessed or confined spaces without protruding, enhancing both safety and aesthetics. This design is crucial for maintaining the integrity of assemblies that require a smooth surface finish and reliable, long-term fastening.

Specification Summary & Compliance

This screw features a 1/2" length and is fully threaded with an 8-40 extra fine (UNF) thread conforming to Class 3A fit standards for high precision. It is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55 and a 70,000 psi tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.