S-92949A846 1/4"-28 x 1 5/8" ASME B18.3, ASTM F879 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 from 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- Exceptional thread engagement and vibration resistance due to the 1/4"-28 UNF fine thread with a precise Class 3A fit.
- High-strength performance with a 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
- Secure, flush-mount fastening with a rounded button head design that minimizes protrusion and snagging.
- Efficient installation and removal using the standard 5/32" hex drive, providing a positive grip for high-torque applications.
- Enhanced durability and surface protection from the passivated finish, which improves corrosion resistance.
- Full compliance with major industry standards including ASME B18.3, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw is engineered to solve critical challenges in precision assembly and industrial maintenance. Its Class 3A UNF fine threading provides superior resistance to loosening under vibration, a common failure point in machinery and electronics. The combination of a passivated finish and stainless steel material ensures long-term performance in corrosive environments, from marine equipment to food processing machinery. The button head profile and hex drive allow for a secure, low-profile fastening solution that is both aesthetically clean and functionally reliable, making it an essential industrial fastener for applications where space is constrained and corrosion resistance is non-negotiable.
Specification Summary & Compliance
This screw features a 1/4"-28 UNF fine thread with a high-precision Class 3A thread fit for accurate and secure mating. It is fully threaded and manufactured to meet ASME B18.3 specifications. The product 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 use in regulated industries.
